AMERICAN SOCIETY FOA TESTING AND MA TERJAlS Used in USDOE-NE standards 100 Barr Harbor Or'., West Consnof1ockef\ PA 19428 ~t Designation: A 213jA 213M - 95a

Repnnted trom the Annual Book of ASTM Standards. Copyright ASTM If not lsted IfI the current combmed index, will appear In the 'iext editIOn

Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes 1 This standard is issued under the fixed designation A 213/A 213M; the number immediately following the designation indicates the year of 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 () indicates an editorial change sine

4mtl A 213/A 213M TABLE 1 Chemical Requirements lor Ferrltic Steel -.----------------------~---------..

CompoSition. % ._-----------

Grade Manga- Phosph- s,,-CartJon no,. rus, max fur, max

Moly!>-Silicon Chromium denum nta-nlum

v .... -dium, rmn

Other Elements

T2c 0.10-0.20 0.30-0.61 0.025 0.025 0.10-0.30 0.50-0.81 0.44-M5 T5 0.15 max 0.30-0.60 0.025 0.025 0.50 max 4.00-6.00 0.45-0.65 T5. 0.15 max 0.30-0.60 0.025 0.025 1.00-2.00 4.00-6.00 0.45-0.65 ... T50 0.12 max 0.30-0.60 0.025 0.025 0.50 mal( 4.00--6.00 0.45-0.65 A T9 0.15 max 0.30-0.60 0.025 0.025 0.25-1.00 8.00--10.00 0.90-1.10 TTl 0.05 mln-Q.15 max 0.3Il--0.60 0.025 0.025 0.50-1.00 1.00-1.50 0.44-0.65 T12c 0.05 min-O.15 max 0.30-0.61 0.025 0.025 0.50 max Q.60-1.25 0.44-0.65 T17 0.15-0.25 0.30-0.61 0.025 0,025 0.15-0.35 0.80-1,25 0.15 1'21 0,05 mirHl15 max 0.30-0.60 0.025 0.025 Q.50max 2,65-3.35 0.80-1.06 T22 0.05 min-Q.15 max 0.30-0.50 0.025 0.025 0.50 max 1.90--2.60 0.87-1.13 T91 0.08-0.12 0.30-0.50 0.020 0.010 0.20--0.50 6.00-9.50 0.85-1.05 0.18- eb 0.06-0.1

0.25 N 0.030-0.070

Ni 0.40 max AI 0.04 max

T92 0.07-0.13 0.30-0.60 0.020 0.010 0.50 max 8.50-9,50 0.15- W 1.5-2.00 0.25 Cb 0.04-0.09

B 0.001-0.006 N 0.03-0.07 Ni 0.40 max AI 0.04 max

0,025 max 1.00 max 0.040 0.030 1.00 max 17.5-19,5 1.75-2.50 N max 0,035 Ni + Cu max 1.00

" Grade T5c shall have a titanium content of not less than four times the carbon content and not more than 0.70 %. 8 Grade 18Cr-2Mo shall have TI + Cb "" 0.20 + 4 (C + N) min. 0.80 max. C It Is permissible to order T2 and T12 with 0.045 max Sulfur.

5.2.2 The grain size of cold-worked Grade TP32 I H, as determined in accordance with Test Methods E 112, shall be No.7 or coarser.

5.2.3 The grain size of TP309H, TP309HCb, TP310H and TP310HCb, as determined in accordance with Test Methods E 112, shall be No.6 or coarser.

5.2.4 The grain size or cold-worked Grade TP347HFG as determined in accordance with Test Methods E 112 shall be between No.7 and No. 10.

6. Heat Treatment 6.1 All tubes of grades shown in Table I, except T5c, T91,

and T92, and in accordance with 6.1.1 sball be reheated and furnished in the full-annealed, isothermal annealed, or normalized and tempered condition. If furnished in the normalized and tempered condition, the minimum tem-pering temperature for Grades IS, T5b, T9, T21, and T22 shall be 1250F [67SoCJ, and the minimum tempering temperature for Grades TIl, and Tl7, shall be 12oo'F [650'C].

6.1.1 Tubing of Grades T2 and TI2 either hot-finished or cold-drawn, may be given a final heat treatment at 1200 to I 350'F [650 to 730'C] instead of heat treatments specified in 6.1 at the option of the manufacturer.

6.1.2 All tubing of Grade T5c shall be given a final heat treatment of approximately 1350'F [730'CJ for a proper time, followed by air or furnace cooling.

6.1.3 Grade T91 shall be normalized at 1900'F [1040'C] minimum and tempered at I 350'F [BOT] minimum as a final heat treatment.

6.1.4 Grade T92 shall be normalized at 1900'F [1040'C] minimum and tempered at J350'F [730'C] minimum as a final heat treatment.

2

NOTE I-Isothermal annealing as appJied to tubular products, may involve austenitizing a ferrous alloy and then cooling to and holding within the range of temperature at which austenite transforms to a relatively soft ferrite-carbide aggregate,

6.2 If any controlled structural characteristics are required these shall be so specified as to be a guide as to the most suitable heat treatment.

6.3 All austenitic tubes shall be furnished in the heat-treated condition. The heat-treatment procedure, except for the H grades and 830815, shall consist of heating the material to a minimum temperature of 19OO'F [1040'C] and quenching in water or rapidly cooling by other means. Alternatively, immediately following hot forming, while the temperature of the tubes is not less than the specified minimum solution treatment temperature, tubes may be individually quenched in water or rapidly cooled by other means.

6.4 All H, 830815, 833228, and S31272 grades shall be furnished in the solution-treated condition. If cold working is involved in processing, the minimum solution treating temperature for Grades TP32 I H, TP347H and TP348H shall be 2000'F [lloo'C] and for Grades TP304H, and TP316H, 1900F [I040C]. If the H grade is hot-rolled, the minimum solution treatment for Grades TP321H, TP347H, and TP348H shall be 1925'F [1050'C], and for Grades TP304H, and TP316H, 19OO'F [I040Cl. The minimum solution treating temperature for S30815 and S31272 shall be I 920'F [I 050'CJ. The minimum solution treating temper-ature for S33228 shall be 2050'F [1120Cj. The minimum solution treating temperature for TP309H, TP309HCb, TP310H, and TP3JOHCb shall be 1900'F [1037'Cl. The minimum solution treating temperature for TP310HCbN shall be 2000'F (1Ioo'C) and sufficient to produce a grain size of No.7 or coarser_

TABLE 2 Chemical RequiremenlS of Austenitic Steel ~---"'

TP ! TP Grade TP201 TP202 TP304 TP TP TP TP TP TP TP TP 304H 304N 304LN 304L 309Cb 309H 309HCb 309S 310Cb i 310H UNS 820100 S20200 S30400 530409 530451 S30453 530403 S30940 S30909 530941 530906 531040 53100'3 OesigoatiOnA

Carboo 0.15 0.15 1 0.06 0.04- 0.06 0.035 0.035 0.08 0.04- 0.04- 0.06 0.06 0.04-max max max 0.10 max max" max" max 0.10 0.10 max max 0.10

.....-.ganese, 5.50- 1.50- 1 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 max 7.50 10.0

PnosphOruS. 0.060 0060 0.040 0.040 0.040 0.040 0.040 0.045 0.045 0.045 0.045 0.045 0.040 max

Sulfur. max 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 Siiioon 1.00 1.00 0.75 0.75 0.75 0.15 0.75 0.75 0.75 0.75 0.75 0.75 0.75

max max m"" max max max max max max -

max max max Nickel 3.50- 4.00- a.oo- 8.00- a.OO- 8.00- a.OO- 12.00- 12.00- 12.00- 12.00- 19.00- 19.0-

5.50 6.00 11.0 11.0 11.0 11,0 13.0 16.00 15.00 16.00 15.00 22.00 22.00 w Chromium 16.0- 17.0- 18.0- 18.0- 16.0 .. 18.0- 18.0 .. 22.00- 22.00- 22.00- 22.00- 24,00- 24.00-

1a.0 19.0 20.0 20.0 20.0 20.0 20.0 24.00 24.00 24.00 24.00 26.00 26.00 MoIytxIenun ... 0,75 0.75 0.75 0.75 0.75

max max

-

max max T1tanum ..

CoIumbMn ... .. 10 x C 10 x C 10 x C .. . + tanta~ ""'. min, ""'. .... 1.10 1.10 1.10

max max max Tantalum.

max Nitrogen" 0.25 0.25 0.10- 0.10- .. ... ...

max max 0.16 0.16 Cerium ... ..

I .. .

0thenI ... ... .. ...

I

TP TP TP 310HCb 310HCbN 3105

$31041 531042 531008

0.04- 0.04- 0.06 0.10 0.10 max

2.00 2.00 2.00

0.045 0.030 0.045

0.030 0.030 0.030 0.75 0.75 0.75

mOJ<

-max

19.0- 17.00- 19.00-22.00 23.00 22.00

24.00- 24.00- 24.00-26.00 26.00 26.00

0.75 0.75

-

max ... ..

10 x C 0.20-mn. 0.60

1.10 mOJ<

.. 0.15- ... 0.35

... .. ..

.. .

. -

531212

0.00-0.12

1.5-2.0

0.030

0.Q15 0.3-

0.7 14.0-

16.0 14.0-

1S.0 1.0-

I.' 0.3-

0.6 ...

...

...

B 0.004 0.008

TP316

531600

0.06 max

2.00

0.040

0.030 0.75

max 11.0-

14.0 16.0-

18.0 2.00-

3.00 ...

...

.. _--_ .... _.- _ .

TP 316H

531609

0.04-0.10

2.00

0.040

0030 075

mOJ< 11.0-

14.0 16.0-

18.0 2.00-

3.00

@ > I\) ...

'" --> I\) ...

~

...

TABLE 2 Continued Gr~ ------TTP31-IiTrPal6N 1TP316LN1 TP317 I ml7l I TP32-,'I-TP32--'H'I-TP34--,'I'lP34--'H,:rTP34-'-LN'lr7P34--nfFG I TP348 I TP348H I XM-15 1 I XM.19 1 ~tioo 1531603 1 $31651 18316531531100 I 531703 1 532100 1 832109 1 534700 I 534709\ 5304751 r--- 1 S34300 153-48091 S381(10 I S300151 S3081SI $31050 1$21500 1 531725153172618326151 S33Z281 820910 I S25700

-------- -

! 0.005-10::

CNbon 10.035 .... 0.035 0." 0.035 .... 0.1"- . ... 0.1'4- 0,06-0_10 0.04- 0.00 0.16- I .... 0,025 100- 0.03 0.03 0.07 O.- '.00- .... 900-13.0 ,00- '.01>- 17.S 13.5- 10.0- 2O.S- '.00- 13.5- 135- 19.0- 31.0- 11 .... 22.1>-

, 15.0 1 . 0 1 . 0 14.0 15.0 13.0 13.0 13.0 13.0 13.0 13.0 13.0 18.S 16,0 12.0 23.5 ,U 17.5 11.5 22.' 33.Q 13.5 250 """"""

It!.O- 16.().. .... 18.0- 18.0- 17.0- 11.0- 11.D- 11.0- 17.0 17 .D-2().0 17.0- 17.0- 17.1)-- 17,0- 200- 2 . a.. 1 . 0- 18.0- 17.0- 16.5- 26.0- 20 ... . 0-18.0 18.0 18.0 20.0 20.0 20.0 20.' 20.' 20.0 20.' 20.0 20.' 19.0 19,5 22.0 26.' 16.0 20.0 .... '.~ 28.0 23.5 11.0

"""-'""' 2 .... 2.00- 2.01>- 3.00- 3.'" 1.6- ..... '.0- '0- 0.3-1.5 1.50- 0.50 3.00 3.00 3.00 '.00 '.00 2 . 1.20 5.00 500 3.00

""" Tl1ri.m ,

""""""'"

, , 0.2- 8)o(C-l.0 , , I '.6- 0.10-. ""- 0.5" i 10 030 T.....-n,max 0,10 0.10 _c

0.10- 0.10- 0.06- 0.14- '.09- 0.10 0.10- 0>0-0.16 0.16 0" 0.20 '15

"'" 020 0.'"

Corium '.03- .OS-0." 0.10

"""'" AlO.6- Cb c.. Co c.. H 0.025 V 0.10--

1.5 0,1> 0.75 ." 1 ....

"'" 0.30

1.25 - -

2.5 V

0.1S-....

B '.000-'.009

-

A New dMignation 1t$tIIbIithed In ~ with Practice E 527 MId SAE Jl086 . FtII'NII dIItnIJter Of .,..,WIIIs, Of bOO'\, wnMIlTIM'ftnwlng pas$6$ ant~"

4~ A 213/A 213M 6,5 The heat treatment of cold-worked TP347HFG com-

prises a softening heat treatment prior to cold-working, and a solution heat treatment after final cold-working, The soft-ening temperature shall be at least 90"F (50"C) higher than the solution heat treatment temperature which shal) be at 2150"F (l180"C) minimum,

6,6 Tubing of Grade 18Cr-2M shall be given a final heat treatment of 1400"F [760"C] or higher, and cooled in such a manner as to meet the requirements of this specification,

6.7 The minimum solution treating temperature for grade UNS S21500 shall be 1920"F (lOSO"C], A maximum solu-tion treating temperature of 2100"F [1150'C] is recom-mended,

6,8 A solution annealing temperature above 1950'F (I06S"C] may impair resistance to intergranular corrosion after subsequent exposure to sensitizing conditions in TP309HCb, TP3IOHCb, TP310HCbN, TP321, TP321H, TP347, TP347H, TP348, and TP348H, When specified by the purchaser, a lower temperature stabilization or res-olution anneal shall be used subsequent to the initial high-temperature solution anneal (see Supplementary Re-quirement S2),

7, Chemical Composition 7, I The steel shall conform to the requirements as to

chemical composition prescribed in Tables I and 2.

8. Product Analysis 8, I An analysis of either one billet or one tube shall be

made from each heat. The chemical composition thus determined shall conform to the requirements specified,

8,2 For Grade T91 the carbon content may vary for the product analysis by -0,0 I % and +0,02 % from the specified range as per Table I.

8.3 If the original test for product analysis fails, retests of two additional billets or tubes shall be made. Both retests, for the elements in question shall meet the requirements of the specification; otherwise all remaining material in the heat or lot (Note 2) shall be rejected or, at the option of the producer, each billet or tube may be individually tested for acceptance. Billets or tubes which do not meet the require-ments of the specification shall be rejected,

NOTE 2-For flattening and flaring requirements. the term 101 applies to aJl tubes prior to cutting of the same nominal size and wall thickness that are produced from the same heat of steel. When final heat treatment is in a batch~type furnace. a lot shall include only those tubes of the same size and from the same Ileat which are heat treated in the same furnace charge. When the final heat treatment is in a continuous furnace or when heaHreated condition is obtained directly by quenching after hot

TABLE 3 Number 01 Tubes In 8 Lot Heal Treated by the Continuous Process or by Direct Quench After Hot Forming

Size of Tube Size of Lot ~~-~~-----=~~-2 in. [SO,8 mm] and over ir1 outsKie diameter and nol more than 50 0.200 in. [5.1 mmJ and over in walt thickness tubes

2 in. [50.S rom] and over In outside diameter and not more than 75 under 0.200 in, [5,1 mmJ in wall thickness tubes

less than 2 In. [50.8 mm] but over 1 in not more than 75 [25.4 mm) In outside diameter lubes

lin. [25,4 mm) or less in outside diameter not more than 125 tubes

5

fonning, the number of tubes of the same size and from the same heat in a lot shall be determined from the size of the tubes as prescribed in Table ),

NOTE 3-For tensile and hardness test requirements, the term /01 applies to all tubes prior to cutting, of the same nominal diameter and wall thickness thal are produced from the same heat of steel. When final heat treatment is in a batch4ype furnace, a lot shall include only those tubes of the same size and the same heat which are heat treated in the same furnace charge. When the final heal treatment is in a continuous furnace or when heat-treated condition is obtained directly by quenching after bot forming, a lot shall include aU tubes of the same size

Grade

F&fritiC Glsdes: Tt2 T91 T92 18Cr-2Mo All other grades Austenitic GrBC1tNi: TP201 TP202 TP304 TP3Q4H TP304N TP304L TP304LN TP309Cb TP309H TP309HCb TP309S TP310Cb TP310H TP310HCb TP310HCbN TP310S

TP3lS TP3t6H TP316L TP316N TP316lN TP317 TP317l TP321 TP321H TP347 TP347H TP347lN TP347HFG TP348 T?348H XM-15

t :s; 0.25 in. t > 0.25 in.

XMt9

TABLE 4 Tensile Requirements

UNS DesignatiOn

K92460

520100 820200 830400 530409 830451 S30409 S30453 830940 830909 830941 830908 $31040 831009 531041 831042 831008 531272 531600 831609 831603 $31651 531653 831700 831703 $32100 532109 834700 834709 834751

834800 834809 838100 830615 830815 831050,

833228 821500 831725 531726 832615 820910 825700

Tensile Strength. min, ksl [MPal

6O(415) 85[585) 9016201 60[4151 6O{4151

951655J 9O[620J 751515J 751515J 9O[55OJ 70(485) 75[5151 751515) 751515) 7515151 75[5151 75[5'5) 75[515J 75[5151 95[655) 75[515) 651450J 751515J 75[515J 70[485J 8O[550J 75[5151 75(515) 75[5151 75[5151 75[5151 75[515J 75[515J 75[515J 60[550J 75(515) 75(515) 75[515) 90(6201 6716001

841580J 7615401 73[500) 761540J 7515151 8015501 801550)

1001690) 7815401

Yield Strength, mln, ksi (MPaJ

321220J 60(4151 64 [4401 40(2751 30(2051

38(2601 45[3101 30[2051 30[2051 3512401 25[1701 3012051 30[205J 30[2051 30[2051 30[2051 3012051 30[2051 30[2051 43[295) 30[205) 2912001 30(2051 30{2051 25{1701 35[2401 3O{2051 30(2051 30(205) 3O(205) 30(2051 30[2051 30(205) 30[2051 30[205) 30[2051 30[2051 30[205) 40(275J 4513101

391270) 371255J 27{165) 331230J 30(2051 35[2401 32[220) 55(380J 35 [2401

Elongation in 2 in. Of 50mm,

min, 'lA.S

30 20 20 20 30

35 35 35 35 35 35 35 35 35 35 35 35 35 35 30 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 40

25 25 30 35 35 35 25 35 50

A When standard round 2 in, Of 50 mm gage length or smaller proportionally sized specimens with gage length equal to 4D (4 limes the diameter) Is used, the minimum elongation Shall be 22" for all fenitic grades except 18Cr2Mo and T91,

It For longitudinal strip tests 8 deduction from the basic minlIDUm elongation values of 1 ,00 % for 1 aCr2Mo, T91. and T92, 1.50 " for 811 other lerritic grades lor each li!Hl. {OJ~mm} decrease In wall thickness below '1'0 in. [8 mm) shall be made.

em\! A 213/A 213M TABLE 4 Continued

The following table gives the computed minimum values:

WaJl Thickness

el1. [0.312) 9~ [0.281} l/4 [0,250) ',;, 10.2191 !V1e [0.188) a;r {O.1S6} 'I, {O.l25J "" [0.0941 I/t. {O,062] 0.062 to 0.035, axel 0.035 to 0.022, axel 0.022 to 0.015 IncI

8 1.2 6.4 5.6 4.8 4 3.2 2.' 1.6

mm

1.610 0.9 0.9 to 0.6 0.6 to 0.4

Elongation in 2 in. or 50 mm. min. ~(;

18Cr-2Mo, 191, and 192

20 19 18 17 16 15 14 13 12 12 11 11

All Other Ferritlc Grades

30 29 27 26 2' 23 21 20 18 17 17 16

NOTE-The aboVe table gives the computed minimum elongatiOn values 10r each 'ha-in. [O.B-mm1 decfease in wall thickness. Where the wall thiCkness lies between two values shown abOve. the minimum elongation value shaM be de1eOTlined by the _wing equation;

Grade lSCr2Mo. 191, and T92

All other ferrUle

where:

E "" elongation in 2 in. or 50 mm. %, and t ... actual tt'\Icl(ness of specimen, in. [mmJ.

Equation E - 32t + 10.00 [E - 1.251 + 10.001 E .. 4& + 15.00 IE = 1.871 + 15.001

C Calculated elongation requirements she.ll be rounded to the nearest whole number.

and heat, heat treated in the same furnace at the same temperature, time at heat, and furnace speed or all tubes of the same size and heal, hot formed and quenching in the same production run.

9. Tensile Requirements 9.1 The material shall conform to the requirements as to

tensile properties prescribed in Table 4.

10. Hardness Requirements 10.1 Ferritie Grades: 1O.1.I Grades T5b, T7, and T9 shall have a hardness not

exceeding 179 HB/ 190 HV (89 HRB). Grades T91 and T92 shall have a hardness not exceeding 250 HB/265 HV (25 HRC).

10.1.2 Grade 18Cr-2Mo shall have a hardness not ex-ceeding 217 HB/230 HV (96 HRB),

10. L3 All other ferritic grades shall have a hardness not exceeding 163 HB/170 HV (85 HRB).

10.2 Austenitic Grades: 10.2.1 Grades TP201 and TP202 shall have a hardness

not exceeding 219 HB/230 HV (95 HRB), 10.2.2 Tubes fabricated from S30815, 831272, S31050,

and S25700 shall have a hardness not exceeding 217 HB (95 HRB),

10.2.3 Tubes fabricated from TP310HCbN shall have a hardness not exceeding 256 HB (100 HRB).

10.2.4 XM-19 (UNS S2091O) shall have a hardness not exceeding 250 HB/265 HV (25 HRC).

10.2.5 All other austenitic grades shall have a hardness not exceeding 192 HB/200 HV (90 HRB).

6

11. Mechanical Tests and Grain Size Determinations Re-quired

1 Ll Tension Test-One tension test shall be made on a specimen for lots of not more than 50 tubes, Tension tests shall be made on specimens from two tubes for Jots of more than 50 tubes (Note 3).

11,2 Flallening Test-One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot (Note 2).

1 1.3 Flaring Test-One flaring test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot (Note 2).

1104 Hardness Test-Brinell or Rockwell hardness tests shall be made on specimens from two tubes from each lot (Note 3).

I 1.5 Hydrostatic Test-Each tube shall be subjected to the hydrostatic test, or, instead of this test, a nondestructive electric test may be used when specified by the purchaser.

I 1.6 Grain Size-Grain size determinations on Grade TP309H, TP309HCb, TP310H, TP310HCb, TP310HCbN, TP321H, TP347HFG, and UNS S32615 shall be made on the same number of tubes as prescribed for the flattening test.

12. Forming Operations 12. I Tubes when inserted in the boiler or tube sheet shall

stand expanding and beading without showing cracks or flaws. Superheater tubes when properly manipulated shall stand all forging, welding, and bending operations necessary for application without developing defects.

NOTE 4-Certain of the femtic steels covered by this specification will harden if cooled rapidly from above their critical temperature. Some wi1J air harden, that is, be

~~ A 213/A 213M 15. Keywords

15.1 alloy steel tube; austenitic stainless steel; boiler tubes; ferritic stainless steel; heat exchanger tube; high-temperature applications; seamless steel tube; steel tube; superheater tubes; temperature service applications-high

SUPPLEMENTARY REQUIREMENTS

The following supplementary requirements shall apply only when specified by the purchaser in the inquiry, contract, or order.

SI. Stress-Relieved Annealed Tubes S 1.1 FOF use in certain corrosives, particularly chlorides

wherc stress corrosion may occur, tubes in Grades TP304L, TP316L, TP321, TP347, and TP34& may be specified in the stress-relieved annealed condition.

Sl.2 When stress-relieved tubes are specified, tubes shall be given a heat treatment at 1500 to 1650'F [815 to 900'C] after roll straightening. Cooling from this temperature range may be either in air or by slow cooling. No mechanical straightening is permitted after the stress-relief treatment.

S 1.3 Straightness of the tubes shall be a matter of negoti-ation between the purchaser and supplier.

S2. Stabilizing Heat Treatment S2.1 Subsequent to the solution anneal required in Sec-

tion 6, Grades TP309HCb, TP310HCb, TP310HCbN, TP321, TP32IH, TP347, TP347H, TP348, and TP348H shall be given a stabilization heat treatment at a temperature lower than that used for the initial solution annealing heat treatment. The temperature of stabilization heat treatment shall be at a temperature as agreed upon between the purchaser and vendor.

S3, Unstraigbtened Tubes S3, I When the purchaser specifies tubes unstraightened

after final heat treatment (such as coils), the minimum yield strength of Table 3 shall be reduced by 5 ksi [35 MPa].

S3.2 On the certification, and wherever the grade designa-tion for unstraightened tubing appears, it shall be identified with the suffix letter "U" (for example, 304-U, 321-U, etc.).

84, lntcrgranular Corrosion Test S4.1 When specified, material shall pass intergranular

corrosion tests conducted by the manufacturer in accordance with Practices A 262, Practice E.

NOTE 5-Practice E requires testing on the sensitized condition for low carbon or stabilized grades, and on the as-shipped condition for other grades,

S4.2 A stabilization heat treatment in accordance with Supplementary Requirement S2 may be necessary and is permitted in order to meet this requirement for the grades containing titanium or columbium. particularly in their II versions.

The American Society lOt Testing and Materials takes no position respecting the vlJlJdlty 01 any pBl8r'tl rights asserted in connection with any Item mentioned In this standard. Users of Uris standard are expressly advised that determination of The validity of any such patent rights, and the risk 01 infringement of such rlgllts, are entirely their own responsibility.

This standard ;s subject to revision at any t/mfJ by the responslbl& toohnlC8l CommittH and I'IW$t be reviewed every five years and If not revised, either reapptoved Of withdrawn. Yoor comments 8r6 invited either lor revision of this :;tsndard or for additional standards and should be addressed to ASTM HfJSdquarters. Your comments will receive careful consideration at a meetIng of the responsible technical committee. which you may attend. " you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, 100 Barr Harbor Drive, West Conshohocken. PA 19428.

7