INTERNATIONAL

Designation: A 924/A 924M - 99

Standard Specification forGeneral Requirements for Steel Sheet, Metallic-Coated bythe Hot-Dip Process1

This standard is issued under the fixed designation A 924/A 924M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (c) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This specification covers the general requirements that,unless otherwise specified in the product specification, apply tosteel sheet in coils and cut lengths, metallic-coated on continu-ous lines by the hot-dip process. The product is intended forapplications requiring corrosion resistance. The product speci-fications contain requirements for specific strength levels, heatresistance, paintability, or formability, or a combinationthereof.

1.2 Subject to individual product specification provisions,steel sheet is available as Commercial Steel (CS) Types A, B,and C, Forming Steel (FS), Drawing Steel (DS), Deep DrawingSteel (DDS), Extra Deep Drawing Steel (EDDS), High Tem-perature Steel (HTS), Structural Steel (SS), and High StrengthLow Alloy Steel (HSLAS). Steel sheet is produced with thefollowing metallic coatings. Specific information on each ofthe following is contained in the individual product specifica-tion:

1.2.1 Zinc or zinc-iron alloy coated,1.2.2 Zinc-5 % aluminum alloy coated,1.2.3 55 % aluminum-zinc alloy coated,1.2.4 Aluminum-coated, and1.2.5 Terne (lead-tin alloy) coated.1.3 Products covered by this general requirements specifi-

cation are described in the following product standards: Speci-fications A 308; A463/A463M; A653/A653M; A755/A 755M; A 792/A 792M; A 875/A 875M; and A 929/A 929M.

1.4 Metallic-coated steel sheet is produced to various coat-ing designations, as shown in the individual product specifica-tions. Except for differentially coated sheet, the coating isalways expressed as the total coating of both surfaces.

1.5 In case of any conflict in requirements, the requirementsof the individual product specifications shall prevail over thoseof this general specification.

1.6 The purchaser is permitted to specify additional require-ments that do not negate any of the provisions of this general

specification or of the individual product specifications. Suchadditional requirements, the acceptance of which are subject tonegotiation with the supplier, shall be included in the orderinformation.

1.7 For purposes of determining conformance with thisspecification and the various product specifications referencedin 1.3, values shall be rounded to the nearest unit in theright-hand place of figures used in expressing the limitingvalues (except to the nearest 5 MPa for SI strength values) inaccordance with the rounding method of Practice E 29.

1.8 Metallic-coated steel sheet covered by this specificationis produced to thickness requirements expressed to 0.001 in.[0.01 mm] for both coils and cut lengths. The thickness is thetotal of the vase steel and the coating.

1.9 The values stated in inch-pound units or SI units are tobe regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are notexact equivalents; therefore, each system must be used inde-pendently of the other.

1.10 This specification and some of the applicable productspecifications are expressed in both inch-pound and SI units.However, unless the order specifies the applicable "M" speci-fication designation (SI units), the product shall be furnished toinch-pound units.

1.ll The text of this specification references notes andfootnotes that provide explanatory material. These notes andfootnotes (excluding those in tables and figures) shall not beconsidered as requirements of the specification.

2. Referenced Documents

2.1 ASTM Standards:A 90/A 90M Test Method for Weight [Mass] of Coating on

Iron and Steel Articles with Zinc or Zinc-Alloy Coatings2A 308 Specification for Steel Sheet, Terne (Lead-Tin Alloy)

Coated by the Hot-Dip Process2A 309 Test Method for Weight and Composition of Coating

on Terne Sheet by the Triple-Spot Test2A 36I/A 361M Specification for Steel Sheet, Zinc-Coated

1 This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05. l l on Sheet Specifications.

Current edition approved April 10, 1999. Published July 1999. Originallypublished as A 924/A 924M - 94. Last previous edition A 924/A 924M - 97a.

2 Annual Book ofASTM Standards, Vol 01.06.

Copyright © ASTM International, 1 00 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1 9428-2959, United States.

384

A 924/A 924M - 99

(Galvanized) by the Hot-Dip Process for Roofing andSiding3

A 370 Test Methods and Definitions for Mechanical Testingof Steel Products4

A 428/A 428M Test Method for Weight of Coating onAluminum-Coated Iron or Steel Articles2

A 463/A 463M Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip Process2

A 653/A 653M Specification for Steel Sheet, Zinc-Coated,(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip Process2

A 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for Domestic Shipment5

A 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel Products4

A 754/ A 754M Test Method for Coating Weight by X-RayFluores cence2

A 755/A 755M Specification for Steel Sheet, MetallicCoated by the Hot-Dip Process and Prepainted by theJoil-Coating Process for Exterior Exposed Building Prod-

ucts2A792/A792M Specification for Steel Sheet, 55 %

Aluminum-Zinc Alloy-Coated by the Hot-Dip Process2A 875/A 875M Specification for Steel Sheet, Zinc-5 %

Aluminum Alloy-Coated by the Hot-Dip Process2A 902 Terminology Relating to Metallic-Coated Steel Prod-

ucts2A 929/A 929M Specification for Steel Sheet, Metallic-

E 29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications6

E 376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy-Current (Electromagnetic) TestMethods7

2.2 Military Standards:MIL-STD- 129 Marking for Shipment and Storage8MBL-STD-163 Steel Mill Products Preparation for Ship-

ment and Storage8?.3 Federal Standard:

^^--red. Std. No. 123 Marking for Shipment (Civil Agencies)8

3. Terminology3. 1 Definitions-For definitions of items used in this speci-

fication, refer to Terminology A 902.

4. Ordering Information4.1 Ordering information for all products are shown in the

individual product specifications.

5. Chemical Composition5.1 Base Steel:

TABLE 1 Product Analysis TolerancesT o le ra n c e

E le m e n tL im ite d o r M a x im u m o f

S p e c ifie d E le m e n t,U n d e r O v e r

M in im u m M a x im u m

L im it L im it

C a r b o n T o 0 .1 5 , in c l 0 .0 2 0 .0 3

O v e r 0 .1 5 to 0 .4 0 , in c l 0 .0 3 0 .0 4

O v e r 0 .4 0 to 0 .8 0 , in c l 0 .0 3 0 .0 5

M a n g a n e s e T o 0 .6 0 , in c l 0 .0 3 0 .0 3

O v e r 0 .6 0 to 1 .1 5 , in c l 0 .0 4 0 .0 4

O v e r 1 .1 5 to 1 .6 5 , in c l 0 .0 5 0 .0 5

P h o s p h o r u s 0 .0 1

S u lf u r 0 .0 1

S ilic o n T o 0 .3 0 , in c l 0 .0 2 0 .0 3

O v e r 0 .3 0 to 0 .6 0 0 .0 5 0 .0 5

C o p p e r 0 .0 2

T ita n iu m T o 0 .1 0 , in c l 0 .0 1 ' 0 .0 1

V a n a d i u m T o 0 .1 0 , in c l 0 .0 1 ' 0 .0 1

O v e r 0 .1 0 to 0 .2 5 , in d 0 .0 2 0 .0 2

M in im u m o n ly s p e c ifie d 0 .0 1

C o lu m b iu m T o 0 .1 0 , in c l o .o v O .O l

3 Discontinued; see 1995 Annual Book ofASTM Standards, Vol 01.06.4 Annual Book ofASTM Standards, Vol 01.03.5 Annual Book ofASTM Standards, Vol 01.05.6 Annual Book ofASTM Standards, Vol 14.02.7 Annual Book ofASTM Standards, Vol 03.03.8 Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700

Robbins Ave., Philadelphia, PA 191 1 1-5094, Attn: NPODS.

A)f the minimum of the range is 0.01 %, the under tolerance is 0.005 %.

5. 1. 1 Chemical composition requirements of the base steelare shown in the individual product specifications.

5.1.2 An analysis of each heat shall be made by themanufacturer to determine the percentage of carbon, manga-nese, phosphorus, sulfur, and any other elements specified orrestricted by the individual product specification.

5.1.3 When desired, product analysis shall be made by thepurchaser on finished product. The product analysis so deter-mined shall meet the tolerances shown in Table 1.

5.1.3.1 Capped or rimmed steels are not technologicallysuited to product analysis due to the nonuniform character oftheir chemical composition, and therefore, the tolerances inTable 1 do not apply. Product analysis is appropriate on thesesteels only when misapplication is apparent.

5.1.3.2 Product analysis for phosphorus or sulfur is nottechnologically appropriate because of segregation of theseelements in non-killed steels. Product analysis is appropriateonly when misapplication is apparent.

5.1.3.3 Samples for product analysis shall be drillingsthrough areas stripped free of coating. At least three piecesshall be selected, but if the product of more than one mill liftor coil is involved, at least six pieces shall be selected.

5.1.3.4 When supplying High-Strength Low-Alloy Steel(HSLA), some producers use one or more microalloyingelements as strengthening agents or use alloy additions to effectinclusion control, or both. The producer shall be consulted forthe specific chemical composition applied. If any alloyingaddition is known to be of concern to the user, the producershall be notified of this concern.

5.1.4 Method of Analysis-The determination of chemicalcomposition is permitted to be made by any test method,except in case of dispute, where the referee test methods listedin the section on test methods of Test Methods A 751 shall beused.

5.2 Coating:5.2.1 Coating Analysis-The nominal composition of the

coating is described in the individual product specification.5.2.2 Method of Analysis-The determination of chemical

composition shall be made in accordance with acceptablechemical, spectrochemical, or other test methods.

385

A 924/A 924M - 99

6. Tests for Mechanical Properties6. 1 Test specimens shall be prepared from finished metallic-

coated product.6.2 Mechanical Properties-Base Metal-When base metal

mechanical properties are specified, tests shall be conducted inaccordance with Test Methods A 370. Requirements for allmechanical properties are included in the individual productspecification s.

6.2. 1 Tension Tests-Specimens for base-metal tension testsshall be taken longitudinally, approximately midway betweenthe center and edge of the product as rolled, and shall conformto the requirements for the sheet-type test specimen in thefigure for rectangular tension test specimens of Test MethodsA370.

6.2.1.1 The determination of the yield strength and tensilestrength values shall be based on the as-produced base-metalthickness that is obtained after stripping the coating from theends of the specimen contacting the grips of the tension testingmachine. The thickness measurement shall be made beforetesting on an end of the specimen that has been stripped free ofcoating.

7. Tests for Coating Properties

7.1 Coating Weight [Mass]:7.1.1 Coating weight [mass] shall conform to the require-

ments prescribed in the individual product specifications (see1.3).

7.1.2 The coating weight [mass] of equally coated productis the total amount on both sides of the sheet, expressed inounces per square foot [grams per square metre] of sheet.

7. 1.3 For differentially coated product, the coating weight[mass] on each surface is nominally one half of the statedcoating designation.

7.2 Coating Weight [Mass] Tests-One of the following testmethods shall be used:

7.2. 1 Weigh-Strip-Weigh Method:7.2.1.1 The weigh-strip-weigh method, described in Test

^ Methods A 90/A 90M, A 309, andA 428/A 428M, is a destruc-

tive test mat determines coating weight [mass] by measuringthe difference in weight [mass] between a coated and a stripped(uncoated) sample. If one surface is protected suitably duringthe initial stripping, coating weight [mass] can be determinedfor each surface independently.

7.2.1.2 Test specimens for product over 18 in. [450 mm] inwidth shall be taken from a representative sample pieceapproximately 1 ft [300 mm] in length by the associated width.Three test specimens shall be taken from the sample, one fromthe middle of the width and one from each edge. The edgesamples shall not be taken closer than 2 in. [50 mm] from eachedge. The test specimen shall have a minimum area of 5in.2 [3200 mm2].

7.2.1.3 For product 18 in. [450 mm] in width and narrower,only one test specimen is required. Specimens shall be at least2 in. [50 mm] from the edge, when possible. For productnarrower than 2.25 in. [60 mm] the test specimen shall bechosen to give a minimum area of 5 in.2[3200 mm2].

7.2.1.4 The triple-spot coating weight [mass] shall be theaverage of the determinations of the three tests done in

accordance with the procedures in 7.2. 1.2.7.2.1.5 The minimum single-spot coating weight [mass]

shall be that test result that is the lightest coating weight[mass], or in those cases where only one test is needed, it shallbe that single test result.

7.2.1.6 The frequency of sampling shall be sufficient toadequately characterize the lot of material being tested.

7.2.2 X-Ray Fluorescence Method:7.2.2. 1 The X-ray fluorescence method is a nondestructive

test that determines coating weight [mass] by converting X-rayfluorescence measurements to coating weight [mass] values.X-ray fluorescence gages can be used as off-line laboratoryinstruments or as a means of continuous on-line testing forconformance to coating weight [mass] requirements, or both.

7.2.2.2 Off-Line Testing-^X-Tsy fluorescence gages can beused as off-line laboratory instruments to test for coatingweight [mass] provided that they have been calibrated inaccordance with Test Method A754/A 754M and use thesample test locations as described in 7.2.1.2 or 7.2.1.3.

7.2.2.3 On-Line Testing--When X-ray fluorescence gagesare used for on-line testing, they shall be operated in accor-dance with Test Method A 754/A 754M. A minimum of fiverandom full-width traverses shall be used to characterize eachcoil tested.

(a) The triple-spot coating weight [mass] of a coil shall bedetermined using the following procedure: from the individualedge, center, edge readings provided by the minimum five fullwidth traverses, compute the average of one edge, the averageof the center, and the average of the other edge. These threeresults shall then be averaged to obtain the triple-spot averageof the coil.

(b) The minimum single-spot coating weight [mass] shall bethe lightest coating weight [mass] obtained from the individualedge, center, edge measurements provided by the minimumfive full width traverses (lightest of at least fifteen readings-five from one edge, five from the center, and five from the otheredge).

7.3 Coating Bend Test-Refer to the individual productspecifi c ation.

7.3.1 Coating bend test specimens shall be 2 to 4 in. [50 to100 mm] wide. The specimen shall be cut not less than 2 in. [50mm] from the edges of the test sheet.

8. Dimensions and Permissible Variations8. 1 The permissible variations for dimensions shall comply

with the applicable limits in Tables 2-14.8.2 Flatness Tolerances:8.2.1 Flatness tolerances for sheet are contained in Table 10

and in Table ll for sheet specified to restricted flatness.8.2.2 Two alternative methods for flatness determination are

the use of I-Units and % Steepness. A description of these twoalternative methods is contained in Appendix X2.

8.2.2.1 The use of I-Units or % Steepness as a flatnessstandard is subject to negotiation between the purchaser andthe producer.

8.2.2.2 Measurement techniques for I-Units and % Steep-ness and rejection limits are subject to negotiation between thepurchaser and producer.

386

A 924/A 924M - 99

TABLE 2 Thickness Tolerances for Hot-Dip Metallic-Coated Sheet-J/a-in. [10-mm] Minimum Edge Distance

å Note 1-The coated sheet thickness includes the base metal and coating and is measured at any point across the width of the coated sheet not 1,an V» in.[10 mm] from a side edge. l iessNote 2-Regardless of whether total thickness tolerance is specified equally or unequally, over and under, the total tolerance shall be equal to å 

ie tabular tolerances. 4 twiceI Note 3-Micrometers used for measurement of thickness shall be constructed with anvils and spindles having minimum diameters of 0 188 ir

]. The tip of the anvil shall be flat or rounded with a minimum radius of curvature of 0.10 in. [2.55 mml and the tin nf thi.~«^nrfiZ'^11"^Micrometers with conical tips shall not be used for thickness measurements of sheet steels. '»»cui uc mu»

Inch-Pou nd U nits

S pecified W idth, in. T hickness Tolerances, P lus and M inus, in., fo r S pecified Thickness in /

O ver Through T hrough O .023 O verO.023 O ver O.043 O vero.061 o ver o o7c TZ IT^ TZ TT hrough O .043 Through O.061 T hrough O.075 Th m ugh O IOI T h�"gh O 187

gn o. 32 0 .003 0 .004 0.005 0.006 0~007 ol n732 40 0 .003 0 .004 0.005 0 .006 0 00 8 o'SS40 60 0 .003 0 .004 0.005 0.006 0 008 0 M 960 72 ... 0 .004 0.005 0.006 - ^

SI U nits

S pecified W idth, m m Thickness Tolerances, Plus and M inus, m m , for Specified Thickness m m s

O ver Through T hrough O.4 O verO.4 O ver l.0 o ver l.5 Q verp o rw T T "Through l.0 T hrough l.5 Through 2.0 T hrough 2 5 T hVo!,gh 5.0

ah 5. 1500 0 .081500 0 .100 .10 0.130.13 0.150.15 0 .200.23 0 .230.23

AThu-Unaoe ic m naciiroH at nnu nnint anrncc tho u/irlth nnt lace th on 3/. in frnm a ciHs o J

^Thickness is measured at any point across the width not less than 10 mm from a side edge.

TABLE 3 Thickness Tolerances for Hot-Dip Metallic-CoatedSheet-1-in. [25-mm] Minimum Edge Distance

Note 1-The coated sheet thickness includes the base metal andcoating and is measured at any point across the width of the coated sheetnot less than 1 in. [25 mm] from a side edge.

Note 2-Regardless of whether total thickness tolerance is specifiedequally or unequally, over and under, the total tolerance shall be equal totwice the tabular tolerances.

Note 3-Micrometers used for measurement of thickness shall beconstructed with anvils and spindles having minimum diameters of 0. 188in. [4.80 mm]. The tip of the anvil shall be flat or rounded with a minimumradius of curvature of 0.10 in. [2.55 mm] and the tip of the spindle shallbe flat. Micrometers with conical tips shall not be used for thicknessmeasurements of sheet steels.

Inch-Pound Units

Scried Widths, in.

Thickness Tolerance, Plus and Minus, in., for Speci-fied Thickness, in.

0.061 and

thinner

Over 0.061 Over 0.075 Over 0.101

to0.075, to 0.101, to0.187,

incl usive incl us ive incl usiveTo 40, inclusive 0.002 0.003 0.006 0.006Over 40 to 60, inclusive 0.002 0.003 0.006 0.007Over 60 to 72, inclusive 0.002 0.003 0.007 0.007

SIUnits

Specified Widths, mm

To 1500, inclusiveOver 1500

Thickness Tolerance, Plus and Minus, mm., for Speci-fied Thickness, mm

1.5 and

thinner

0.05

0.05

O v e r 1 .5 O v e r 2 .0 O v e r 2 .5

to 2 .0 , to 2 .5 , to 5 .0 ,

i n c lu s iv e in c lu s iv e in c lu s iv e

0.08

0.08

0.15

0.18

0.18

0.18

9. Number of Tests and Retests

9.1 Number of Tests-The frequency of tests by the pro-ducer shall be adequate to ensure conformance of the lot. Theproducer and user shall agree to a frequency other than thatnormally used by the producer.

TABLE 4 Width Tolerances for Hot-Dip Metallic-Coated SheetCoilS. and Cut I anntk. M_»r» .. . '

'•E•Etjiiis, nui nesquareaI nch-Pou nd U n its

S pecified W idth, in.Tolerance O ver SpecifiedW idth, N o Tolerance

U nder, in.O ve r Th rough

12 30

30 48

48 6060 72

y8

･16

Va^18

SI U nits

Specified W idth, m m Tolerance O ver SpecifiedW idth , N o Tolerance

U nde r, m mO ve r Th rough

300 600600 1200

1200 1500

1500 1800

35

68

9.2 Number of Retests:9.2. 1 Retests may be permitted if test method variability as

described in 9.2.2, is believed to be a cause of the out-of-specification test result. Retests are also permitted under thecriteria described in 9.2.3.

9.2.2 Test method variability is considered to be a factor iftest results on an original test specimen are within 2 ksi [15MPa] of the required tensile strength, within 1 ksi [5 MPa] ofthe required yield strength, within 2 % of the required elonga-tion, or within 0.05 oz/ft2 [15 g/m2] of the specified coatingweight. If such is the case, two additional tests shall be takenat random. If the results on both of these retest specimens meetthe specified requirements, the lot shall be accepted. Forchemical analysis not in conformance, retesting shall be doneby the methods contained in the section on test methods of TestMethods, Practices, and Terminology A 751.

9.2.3 If the original test results do not conform to the

i

å i '\>

387

A 924/A 924M - 99

TABLE 5 Length Tolerances for Hot-Dip Metallic-Coated Sheet,Cut Lengths, Not Resquared

Inch-Pound Units

Specified Length, in.

Over Th rough

12306096

120156192240

306096

120156192240

SI Units

Specified Length, mm

Over Th rough

3001 50030006000

1 50030006000

Tolerance Over SpecifiedLength, No Tolerance

Under, in.

Va,

1/2

%1VAV/21%

Tolerance Over SpecifiedLength, No Tolerance

Under, mm

6203545

TABLE 7 Diameter Tolerances for Hot-Dip Metallic-Coated Sheet,Sheared CirclesIn c h -P o u n d U n its

To le ra n ce O v e r S p e c ified D ia m e te r, N o

S p ec ifie d T hick n es s , in . T o le ra n c e U n d e r, in .

D i a m e te rs

O v e r T h ro u g h U n d e r 3 0 3 0 th ro ug h 4 8 O v e r 4 8

0 .6 1 V i e V a 3/i 6

0 .0 6 1 0 .1 0 1 % 2 % a

0 .10 1 Ve V i e Va

S I U n its

To le ra n ce O v e r S p e c ified D ia m e te r, N o

S pe c ifie d T h ic k ne s s, m m T o le ra n ce U n de r, m m

D ia m e te rs

O v e r T h ro u g h T h ro u g h 6 00 O v e r 6 0 0 O v e r 1 2 00

T h ro ug h 12 0 0

1 .5 1 .5 3 .0 5 .0

1.5 2 .5 2 .5 4 .0 5 .5

2 .5 3 .0 5 .0 6 .5

TABLE 6 Camber Tolerances for Hot-Dip Metallic-Coated Sheet

Note 1-Camber is the greatest deviation of a side edge from a straightline, the measurement being taken on the concave side with a straightedge.

Note 2-The camber tolerances for sheet in cut lengths, not resquared,are as shown in this table.

In c h - P o u n d U n it s

F o r C o ils O v e r 1 2 in . in W id th

C u t L e n g th , ft

C a m b e r T o le r a n c e , in .o v e r T h ro u g h

4 i/e

^ 16

6 8 V a

1 0

1 0 1 2 %

1 2 1 4 y 2

1 4 1 6 %

1 6 1 8 %

1 8 2 0 %

2 0 3 0 蝣P / 4

3 0 4 0 V / 2

S I U n it s

F o r C o ils O v e r 3 0 0 m m in W id th

C u t L e n g th , m m

C a m b e r T o le ra n c e , m mo v e r T h ro u g h 蝣

1 2 0 0

1 2 0 0 1 8 0 0

1 8 0 0 2 4 0 0

2 4 0 0 3 0 0 0

3 0 0 0 3 7 0 0 1 0

3 7 0 0 4 3 0 0 1 3

4 3 0 0 4 9 0 0 1 6

4 9 0 0 5 5 0 0 1 9

5 5 0 0 6 0 0 0 2 2

6 0 0 0 9 0 0 0 3 2

9 0 0 0 1 2 2 0 0 3 8

*The camber tolerance for sheet in coils is 1 in. in any 20 ft, except as shown inTable 14.

^The camber tolerance for sheet in coils is 25 mm in any 6000 mm, except asshown in Table 14.

specification for either base-metal properties or coating and areoutside the criteria described in 9.2.2, the product represented

TABLE 8 Out-of-Square Tolerances for Hot-Dip Metallic-CoatedSheet Cut Lengths, Not Resquared

Note 1-Out-of-square is the greatest deviation of an end edge from astraight line at right angles to a side and touching one corner. It is alsoobtained by measuring the difference between the diagonals of the cutlength. The out-of-square deviation is one half of that difference.

Inch-Pound UnitsFor Coils Over 12 in. in Width

The tolerance for cut lengths of all thicknesses and all sizes is Viein. in each 6in. of width or fraction thereof.

SIUnitsThe tolerances for cut lengths of all thicknesses and all sizes is 1.0 mmin each100 mmof width or fraction thereof.

TABLE 9 Resquared Tolerances for Hot-Dip Metallic-CoatedSheet

Note 1-When cut lengths are specified resquared, the width andlength are not less than the dimensions specified. TTie individual tolerancefor over-width, over-length, camber, or out-of-square shall not exceed thestated values.

Inch-Pound UnitsFor Cut-lengths Over 12 in. in Width

Shall not exceed Vie in. for cut lengths up to and including 48 in. in width andup to and including 120 in. in length. For cut lengths wider or longer the appli-cable tolerance is Ve in.

SI UnitsShall not exceed 1.6 mmfor cut lengths up to and including 1200 mm in widthand up to and including 3000 mm in length. For cut lengths wider or longer, theapplicable tolerance is 3.2 mm.

by the out-of-specification test results must be discarded and anew test shall be taken from the remaining lot adjacent to theproduct associated with the out-of-specification test result. Theretest must conform to the requirements of this specification.

10. Inspection

10.1 The producer shall afford the purchaser's inspectorreasonable access to facilities to ensure that the product isbeing produced in compliance with this specification. Unlessotherwise specified, all inspection and tests, except productanalysis, shall be made at the producer's facilities prior to

388

A 924/A 924M - 99

TABLE 10 Flatness Tolerances for Hot-Dip Metallic-CoatedSheet, Cut Lengths

Note 1-This table does not apply to structural steel (SS) and High-Strength Low-Alloy Steel (HSLAS),

Note 2-This table also applies to sheet cut to length from coils by theconsumer when adequate flattening measures are performed

Inch-Pound Units

Specified Specified Width, in. Flatn essT h ic k n e s s , in . O v e r T h ro u g h T o le ra n c e ,'* in .

T h ro u g h 0 .0 4 8 1 2 3 6 %

3 6 6 0 %

6 0 7 2 %

O v e r 0 .0 4 8 1 2 3 6 1/4

3 6 6 0 %

6 0 7 2 %

S I U n it s

S p e c ifie d S p e c ifie d W id th , m m F la tn e s s

T h ic k n e s s , m mO v e r T h ro u g h

T o le ra n c e ,'* m m

T h ro u g h 1 .0 3 0 0 9 0 0 1 0

9 0 0 1 5 0 0 1 5

1 5 0 0 2 0

O v e r 1 .0 3 0 0 9 0 0 8

9 0 0 1 5 0 0 1 0

1 5 0 0 1 8 0 0 1 5

1 8 0 0 2 0

^Maximumdeviation from a horizontal flat surface.

TABLE ll Flatness Tolerances Specified to Restricted Flatnessfor Hot-Dip Metallic-Coated Sheet, Cut Lengths

Inch-Pound UnitsSpecified

Thickness, in.Specified

Width, in.Specified

Length, in.Flatness

Tolerance,* in.

Over 0.019through 0.032

Over 0.032

SpecifiedThickness, mm

over 12 through 36 through 120, inclusive

wider or longerover 12 through 48 through 120, inclusive

wider or longer

SI Units

SpecifiedWidth, mm

SpecifiedLength, mm

FlatnessTolerance,"4 mm

0.35 through 0.8 through 900 through 3000 8wider or longer 10

Over 0.8 through 1 200 through 3000 5wider or longer 8

^Maximum deviation from a horizontal flat surface.

shipment. Such inspection or sampling shall be made concur-rently with the producer's regular inspection and test opera-tions unless it causes interference with normal operations or isotherwise specified.

10.2 Responsibility for Inspection-Unless otherwise speci-fied in the contract or purchase order, the producer is respon-sible for the performance of all inspection requirements asspecified herein. Except as otherwise specified in the contractor order, the producer's facilities, or any other facilitiessuitable for the performance of the inspection requirements,shall be used. The purchaser reserves the right to perform anyof the inspections set forth in this specification to ensuresupplies and services conform to the prescribed requirements.

ll. Rejection and Rehearing

ll.1 Unless otherwise specified, any rejection shall bereported to the producer within a reasonable time after receipt

TABLE 12 Width Tolerances-Narrow Widths for Hot-DipMetallic-Coated Sheet, Coil and Cut Lengths, Not Resquared

Note 1-This table applies to widths produced by slitting from widersheet.

Note 2-The specified width range captions noted as follows are alsoapplied when sheet is specified to width tolerance all over, nothing under.In such cases, the stated tolerances are doubled.

Note 3-Tolerances based upon practice found to be generally fol-lowed by producers.

In c h -P o u n d U n its

S p e c if ie d T h ic k n e s s , in . T o le ra n c e s O v e r a n d U n d e r S p e c ifie d W id t h , in .

O v e r T h r o u g hF ro m 2 O v e r 6 O v e r 9

T h ro u g h 6 T h ro u g h 9 T h r o u g h 1 2

0 .0 1 4 0 .0 6 8 0 .0 0 8 0 .0 1 6 0 .0 3 2

0 .0 6 8 0 .0 8 3 0 .0 1 2 0 .0 1 6 0 .0 3 2

0 .0 8 3 0 .1 1 0 0 .0 1 6 0 .0 3 2 0 .0 3 2

0 .1 1 0 0 . 1 8 7 0 .0 3 2 0 .0 3 2 0 .0 3 2

S I U n its

S p e c ifie d W id th , m mW id th T o le r a n c e , O v e r a n d U n d e r, m m

O v e r T h r o u g h

5 0 1 0 0 0 .3

1 0 0 2 0 0 0 .4

2 0 0 3 0 0 0 .8

TABLE 13 Length Tolerances-Narrow Widths for Hot-DipMetallic-Coated Sheet, Cut Lengths, Not Resquared

Note1-This table applies to widths of2 to 12 in. [50 to 300 nun] incl,that have been produced by slitting from wider sheet.

In c h -P o u n d U n its

S p e cifie d L e n g th , in . T o le ra n c e O v e r S p e cifie dL e n gth , N o To le ra n ce

O v e r T h rou g h U n de r, in .

fro m 2 4 6 0 1/26 0 1 2 0 %

1 2 0 2 4 0 1

S I U n its

S p e cifie d L e n g th , m m T o le ran c e O v e r S p e c ifie d

L e n gth , N o To le ra n c eO v e r T h ro ug h U n de r, m m

60 0 1 5 0 0 1 51 5 0 0 3 0 0 0 2 0

3 00 0 6 0 0 0 2 5

TABLE 14 Camber Tolerances-Narrow Widths for Hot-DipMetallic-Coated Sheet, in Coils

Note 1-This table applies to widths of2 to 12 in. [50 to 300 mm] incl,that have been produced by slitting from wider sheet.

Inch-Pound UnitsThe camber tolerance is V* in. in any 8 ft.

SI UnitsThe camber tolerance is 5.0 mmin any 2000 mm.

of product by the purchaser.ll.2 Product that is reported to be unacceptable subsequent

to the shipment to the purchaser's plant, shall be set aside,adequately protected, and correctly identified. The producershall be notified as soon as possible to permit a timelyinves tigation.

1 1.3 Samples that are representative of the rejected product

389

A 924/A 924M - 99

shall be made available to the producer. In the event that theproducer is dissatisfied with the rejection, a rehearing shall berequested.

12. Certification

12.1 When required by the purchase order, a certificate ofcompliance or a test report, or both, shall be furnished to thepurchas er.

12.1.1 The certificate of compliance shall include a certifi-cation that the product has been manufactured and tested inaccordance with the requirements of the product specification,and that the test results conform to the requirements of thatspecification.

12.1.2 The test report shall show the heat analysis and theresults of all tests required by the product specification and theorder.

12.1.3 These documents shall provide information neces-sary to identify the product represented; for example, themanufacturer's name or brand, ASTM specification, coatingdesignation, grade (when required), ordered thickness, width,length (if cut length), and unit identification (heat number, coilnumber, etc.).

12.1.4 A signature is not required. However, the certifica-tion documents shall clearly identify the organization submit-ting the information. Notwithstanding the absence of a signa-ture, the organization submitting the documents is responsiblefor the accuracy of the information.

12.2 The furnishing of a certificate of compliance or testreport, or both, shall not restrict the right of the purchaser tosample and test the product furnished.

13. Packaging and Package Marking13.1 It is common practice to use the methods of packaging

as listed in the latest revision of Practices A700, but thepurchaser is permitted to specify other packaging methods.

13.2 As a minimum requirement, the product shall beidentified by having the manufacturer' s name or brand, ASTMspecification/ coating designation, grade, size, unit weight,purchaser' s order number, and unit identification (that is, ticketnumber, coil number, etc.) legibly shown on a tag attached toeach coil or shipping unit.

13.3 Most producers are able to ink stamp metallic-coatedsheet with their logo and the pertinent ASTM specificationwhen ordered in either coil or cut lengths. Since many of themetallic-coated products are stamped with a permanent ink(not water soluble), the purchaser shall be very specific whenplacing an order as to the requirements on sheet marking.

13.4 The purchase order shall include the specific loadinginstructions.

13.5 When specified in the contract or order, and for directshipments to the U.S. Federal government, when Level A isspecified, preservation, packaging, and packing shall be inaccordance with the Level A requirements of MIL-STD-163.Marking for shipment shall be in accordance with Fed. Std. No.123 for civil agencies and MDL-STD-129 for military agencies.

14. Keywords

14.1 aluminum-coated iron/steel; aluminum-zinc alloy-coated steel, 55 %; coating; coatings-aluminum;coatings-55 % aluminum-zinc; coatings-hot dip; coatings-metallic; coatings-terne metal; coatings-zinc (hot-dip);coatings-zinc-5 % aluminum; corrosion; hot-dip; metallic-coated; sheet; steel; steel products-hot-dip coatings; steelsheet-aluminum-coated; steel sheet-terne coated; steelsheet-zinc-coated (galvanized) ; zinc-coated iron/steel

1

APPENDIXES

(Nonmandatory Information)

XI. PRODUCT INFORMATION

Xl.l Metallic coated sheets are used to provide corrosionprotection to steel. The various types of coatings have differentcharacteristics and the consumer should consult the individualproducers for applicability and product data.

XI.2 Metallic-coated sheet of rimmed- or capped-typesteels is subject to the phenomenon commonly known as agingwhen stored over a period of time. This may result in suchsurface disturbances as fluting and stretcher strains whenfabricated. To minimize fluting, effective roller leveling mustbe performed immediately before fabrication, or Deep Draw-ing Steel (DDS), which ages at a slower rate, should bespecified. To minimize stretcher straining, extra-smooth steelsheet is required and it must be effectively roller-leveledimmediately prior to fabrication, otherwise extra-smooth DDSmust be specified.

XI.3 Metallic-coated sheet in coils is subject to coil breakswhen coiled to a smaller inside diameter than is compatible to

the thickness of the sheet. Other factors also effect thistendency for coil breaks.

X1.4 The production of coils does not afford the sameopportunity for inspection and sorting as does the production ofcut lengths. Consequently, appropriate processing and qualitycontrol procedures are required by the purchaser to obtainoptimum utilization of the product.

XI.5 Coating Thickness Measurements with MagneticGages-A reasonable estimate of weight [mass] of coatingmay be obtained by converting coating thickness measure-ments made with magnetic gages. An accuracy of ± 15 % indetermining the thickness may be realized by following therecommended practice for magnetic instruments described inPractice E 376. This test may be used as a basis for acceptance,but rejection shall be governed by the weight [mass] of coatingtests described in Section 7.

390

A 924/A 924M - 99

X2. ALTERNATIVE METHODS FOR EXPRESSING FLATNESS

TABLE X2.1 Flatness Conversion Factors'4'8

I-Unit Height %Steepness

I

r

I-Unit, /

Height, H, peak topeak

% Steepness, S

1

^)"1"

2.5 (it S)2 (L S)100

AL = wave interval as defined in Fig. X2.1(a).BExamples:

(1) Assume % steepness is given as 1.5 and the corresponding l-unit value is desired. From Table X2.1.7 = 2.5(ir Sf = 2.5[(3.14)(1.5)]2 = 55.5.(2) Assume an l-unit value of 25 is given and the corresponding % steepness is desired. From Table X2.1, S = 2/tr (/ x 10~1)'/2 = 2/3.14 (25 x 10"1)1/2 = 1.0.

in Fig. X2.l(b). Using the length of one of these strips as areference ( Lref), the I-unit value (7) for an individual strip isdefined as follows:

¥ W M m B B m m m m m m m m m m m m m m mH - H eightL - LengthR D ｻ R ollin g D irection

,R D

L

Ca)

-!/*L ,

"Lxef

^m mmmm^ mmmmmmmmmmmmma^蝣BB m m - - - i^(b)

FIG. X2.1 Representa t ion of Sheet Sample with Edge Waves( a)and Str ips of Differ ing Length which Resul t f rom Making

Longi tudinal Cuts Along the Sample (b)

X2. 1 Int roduct ion and Defini t ions:

X2.1.1 In addit ion to the conventional expression of flat-ness, the "maximumdeviat ion from a horizontal f lat surface,"at least two other f latness parameters have been developed andare in use for character izing sheet with longitudinal waves orbuckles. These are Steepness Index and Flatness Index (orI-Unit) , which are il lustrated using the example in Fig. X2.1.

X2.1.2 Steepness Index-Fig. X2.1(a) shows a representa-tion of a sheet sample exhibi t ing edge waves of height H andinterval L. The steepness index value for this sample is definedas fol lows:

s teepness index = H/L ( X 2 . 1 )

Often the steepness value is expressed as a percentage, asfol lows:

% steepness = S = (H/L) X 100 (X2.2)

X2.1.3 I-Units-Making a series of lengthwise cuts to thesample in Fig. X2.1( a) relaxes elast ic s tresses present in thesheet and results in narrow strips of differ ing lengths, as shown

/ = ( A L / L K f ) X 1 0 5 ( X 2 . 3 )

where AL = difference between the length of a given str ipand the reference str ip.

X2.1.4 For the special case of waves/buckles that areperfect ly sinusoidal in character , the fol lowing relat ionshipapplies:

-[(5)©]

/ = 2 4 . 7 5 '

X 1 0 5 ( X 2 . 4 )

( X 2 . 5 )

X2.1.4.1 Fig. X2.2 provides I-unit values based on thesinusoidal approximation for waveheights up to l/ i in . [10 mm]( increments of lM in. [0.5 mm]) and intervals between 10 and40 in. [250 and 1000 mm] (increments of 1 in. [25 mm]).Mathematical relat ionships between the three representat ionsof f latness described here are given in Table X2.1; theserelat ionships can be used to convertbetween I-unit , % steep-ness, and waveheight values (see examples in Table X2.1) .

X2.2 Flatness Evaluat ion Example and Determinat ion ofI-Unit or % Steepness Value:

X2.2.1 While the str ip is on an inspect ion table, f ind thelocat ions on the str ip that are not lying flat on the table. If nof latness deviat ion can be found, that port ion of the coil(head/middle/ tai l ) can be described as flat (that is , zero I-unit orzero % steepness) .

X2.2.2 If the coil is not total ly f lat , the height of thedeviat ion must be determined and recorded. If the coil has edgewaves,a step gage (incremented in intervals of Vie or Vh in. [1or 0.5 mm]) can be inserted under a wave to determine theheight . If the coil exhibi ts f la tness deviat ion in the center of thestr ip, a l ightweight straightedge can be placed on the highestport ion of the buckle and on the highest port ion of the nextrepeat ing buckle. The height can then be determined byinsert ing a step gage between the straightedge and the str ip.

X2.2.3 Along with the height , the wave period or waveinterval must also be determined. The wave interval can be

391

A 924/A 924M - 99

W avelength (in.)

W ave

H eight

flrD 10 ll 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 2 9 30 31 32 33 34 35 36 37 38 3 9 401 /32 2 2 2 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 01/16 10 8 7 6 5 4 4 3 3 3 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 13/32 22 18 15 13 ll 10 8 8 7 6 5 5 4 4 4 3 3 3 3 3 2 2 2 2 2 2 2 2 2 1 11/8 39 32 27 23 2 0 17 15 13 12 ll 10 9 8 7 7 6 6 5 5 5 4 4 4 4 3 3 3 3 3 3 25/32 60 50 42 36 31 27 24 2 1 19 17 15 14 12 ll 10 10 9 8 8 7 7 6 6 6 5 5 5 4 4 4 43/16 87 72 60 51 44 39 34 30 27 24 22 20 18 16 15 14 13 12 ll 10 10 9 8 8 8 7 7 6 6 6 57/32 118 98 82 70 60 53 46 4 1 36 33 30 27 24 22 2 1 19 17 16 15 14 13 12 12 ll 10 10 9 9 8 8 71/4 154 128 107 91 7 9 69 60 53 48 43 39 35 32 29 27 2 5 23 21 2 0 18 17 16 15 14 13 13 12 ll ll 10 109/32 195 161 136 116 100 87 76 68 60 54 49 44 40 37 34 3 1 29 27 25 23 22 20 19 18 17 16 15 14 14 13 125/1 6 241 199 168 143 123 107 94 83 74 67 60 55 50 46 42 3 9 36 33 31 29 27 2 5 24 22 21 20 19 18 17 16 15

1 1/32 292 241 203 173 14 9 130 114 10 1 90 81 73 66 60 55 51 47 43 40 37 35 32 30 29 27 25 24 23 21 20 19 183/8 347 287 24 1 206 177 154 136 120 107 96 87 7 9 72 66 60 56 51 48 44 41 39 36 34 32 30 28 27 25 24 23 221 3/32 408 337 283 241 2 08 181 159 141 126 113 102 92 84 77 71 65 60 56 52 48 45 42 40 37 35 33 31 30 28 27 257/16 473 391 328 280 24 1 210 185 164 146 13 1 118 107 98 89 82 76 70 65 60 56 53 49 46 43 41 39 36 35 33 3 1 301 5/32 543 449 377 321 277 241 212 188 168 150 136 123 112 103 94 87 80 74 69 65 60 56 53 50 47 44 42 40 38 36 341/2 618 510 429 365 3 15 274 24 1 214 191 171 154 140 128 117 107 99 91 85 79 73 69 64 60 57 53 50 48 45 43 41 39

IH U

W avelength (m m )

W ave

H eight

(m m )250 27 5 300 325 350 375 4 00 425 450 475 500 525 550 575 600 625 650 67 5 700 725 7 50 775 800 825 850 875 900 925 950 975 1000

0.5 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 01.0 4 3 3 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 01.5 9 7 6 5 5 4 3 3 3 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 12.0 16 13 ll 9 8 7 6 5 5 4 4 4 3 3 3 3 2 2 2 2 2 2 2 1 1 1 1 1 1 1 12.5 25 2 0 17 15 13 ll 10 9 8 7 6 6 5 5 4 4 4 3 3 3 3 3 2 2 2 2 2 2 2 2 23.0 36 29 25 21 18 16 14 12 ll 10 9 8 7 7 6 6 5 5 5 4 4 4 3 3 3 3 3 3 2 2 23.5 48 40 34 29 25 22 19 17 15 13 12 ll 10 9 8 8 7 7 6 6 5 5 5 4 4 4 4 4 3 3 34.0 63 52 44 37 32 28 25 22 20 18 16 14 13 12 ll 10 9 9 8 8 7 7 6 6 5 5 5 5 4 4 44.5 80 66 56 47 4 1 36 3 1 28 25 22 20 18 17 15 14 13 12 ll 10 10 9 8 8 7 7 7 6 6 6 5 55.0 99 82 69 58 50 44 39 34 30 27 25 22 20 19 17 16 15 14 13 12 ll 10 10 9 9 8 8 7 7 6 65.5 120 99 83 7 1 6 1 53 47 4 1 37 33 30 27 2 5 23 2 1 19 18 16 15 14 13 12 12 ll 10 10 9 9 8 8 76.0 142 118 99 84 73 63 56 4 9 44 39 36 32 29 27 25 23 2 1 20 18 17 16 15 14 13 12 12 ll 10 10 9 96.5 167 138 116 99 85 74 65 58 52 46 42 38 34 32 29 27 2 5 23 21 20 19 17 16 15 14 14 13 12 12 ll 107.0 194 160 134 115 99 86 76 67 60 54 48 44 40 37 34 31 29 27 25 23 22 20 19 18 17 16 15 14 13 13 127.5 222 184 154 132 1 13 99 87 77 69 62 56 50 4 6 42 39 36 33 30 28 26 25 23 22 20 19 18 17 16 15 15 148.0 253 209 176 150 129 112 99 88 78 7 0 63 57 52 48 44 40 37 35 32 30 28 2 6 25 23 22 21 20 18 18 17 168.5 2 86 236 198 169 146 127 112 99 88 79 7 1 65 59 54 50 46 42 39 36 34 32 30 28 26 25 23 22 21 2 0 19 189.0 3 20 265 222 189 163 142 125 111 99 89 80 73 66 61 56 51 47 44 4 1 38 36 33 31 29 28 26

29

25 23

26

22 21

23

20

229.5 3 57 295 248 2 11 182 159 139 123 110 99 89 81 74 67 62 57 53 49 4 5 42 40 37 35 33 31 28 2510.0 395 327 274 234 202 176 154 137 122 109 99 90 82 75 69 63 58 54 50 47 44 4 1 39 36 34 32 30 29 27 26 25

FIG. X2.2 I-Unit Conversion Chart

obtained by using a standard tape measure or straightedge tomeasure the distance between the highest point of one flatnessdeviation to the highest point of the next repeating flatnessdeviation.

X2.2.4 After determining the height and wave interval,either the I-unit or % steepness value can be obtained. To

determine the I-unit flatness, locate the appropriate height andwave interval in Fig. X2.2 and read the I-unit value at theintersection of the two measurements. To determine % steep-ness, divide the height by the wave interval and multiply theresult by 100.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted byASTM International, 100 Ban Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or service@astm.org (e-mail); or through the ASTM website(www.astm.org).

392