2- ksd3503-rolled steels for general structure

KSKSKSKSKSKSKSK KSKSKS KSKSK KSKS KSK KS

KS D 3503

㉿ Rolled steels for general structure

KS D 3503:2008

Translated and Published by Korean Standards Association

http:// www. kssn.net

○C KSA 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any

means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher

Translation without guarantee In the event of any doubt arising, the original standard in

korean is to be evidence

2012-02-16, (주)케이투이엔지에 라이센스를 부여하며 불법 복사 및 무단 배포를 금합니다.

KOREAN INDUSTRIAL STANDARD

KS D 3503:2008

㉿ Rolled steels for general structure

1 Scope

This Korean Standard specifies the hot rolled steels used for general structure such as bridges, ships,

rolling stocks and other structures (hereafter, referred to as "steel product").

2 Normative References

The following referenced documents are indispensable for the application of this document. For

dated references, only the edition cited applies. For undated references, the latest edition of the

referenced document (including any amendments) applies.

KS B 0801, Test Pieces for Tensile Test for Metallic Materials

KS B 0802, Method of Tensile Test for Metallic Materials

KS B 0804, Method of Bend Test for Metallic Materials

KS D 0001, General Rules for Inspection of Steel

KS D 1652, Iron and Steel Method for Spark Discharge Atomic Emission Spectrometric Analysis

KS D 1655, Method for X-ray Fluorescence Spectrometric Analysis of Iron and Steel

KS D 1659, Methods for Atomic Absorption Spectrophotometric Analysis of Iron and Steel

KS D 1673, Methods for Inductively Coupled Plasma Emission Spectrochemical Analysis of Steel

KS D 1802, Methods for Determination of Phosphorus in Iron and Steel

KS D 1803, Methods for Determination of Sulfur in Iron and Steel

KS D 1804, Determination of Carbon in Iron and Steel

KS D 1806, Determination of manganese in iron and steel

KS D 3051, Dimensions Weight and Tolerances of Hot Rolled Steel Bars and Bar in Coil

KS D 3052, Shape Dimensions, Weight and Tolerances of Hot Rolled Steel Flats

KS D 3500, Dimensions, Weight and Permissible Variations of Hot Rolled steel Plates, Sheets and

Strip

KS D 3502, Dimensions, Weight and Tolerances of Hot Rolled steel Sections

KS D ISO 377, Steel and steel products – Location and preparation of samples and test pieces for

mechanical testing


KS D 3503:2008

2

3 Grade and Symbol

The steel product shall be classified into five categories and their symbols shall be as given in Table 1.

Table 1 ― Symbol of Grade

Symbol of grade Applicable steel product

SS330 Steel plates and strips, wide flat and bar steels

SS400

SS490 Steel plates and strips, section, wide flat and bar steels

SS540

SS590

Steel plates and strips, section and wide flat steels of 40 mm or less in thickness

and bars of 40 mm or less in diameter, side length or width across flat.

NOTE Bars include bars in coil.

4 Chemical Composition

The steel product shall be tested in accordance with clause 8.1 and the ladle analysis values thereof

shall be as given in Table 2.

Table 2 ― Chemical Composition

unit: %

Symbol of grade C Mn P S

SS330

SS400

SS490

- - ≤ 0.050 ≤ 0.050

SS540

SS590 ≤ 0.30 ≤ 1.60 ≤ 0.040 ≤ 0.040

NOTE Alloying elements other than those given in Table 2 may be added as necessary.

5 Mechanical Properties

The steel product shall be tested in accordance with clause 8.2 and the yield point or yield strength,

tensile strength, elongation and bendability thereof shall be as given in Table 3. As to the bendability,

the outside surface of the bent portion shall be free from visible crack.


KS D 3503:2008

3

Table 3 ― Mechanical Properties

Yield point or yield strength

(N/mm2) Bendability

Thickness (t) of steel product a

(mm)

Symbol

of

grade

t ≤ 16 16 < t

≤ 40

40 < t

≤ 100 t > 100

Tensile

strength

(N/mm2)

Thickness (t) of

steel product a

(mm)

Test

piece

Elongation

(%) Angle

of

bending

Inside

radius

Thickness of

steel plates and

strip, and wide

flat steel

t ≤ 5

No. 5 ≥ 26

Thickness of

steel plates and

strip, and wide

flat steel

5 < t ≤ 16

No. 1A ≥ 21

Thickness of

steel plates and

strip, and wide

flat steel

16 < t ≤ 40

No. 1A ≥ 26

Thickness of

steel plates and

wide flat steel,

t > 40

No. 4 ≥ 28

180°

0.5 times

the

thickness

Diameter, side

or width across

flats of bar

steels,

≤ 25

No. 2 ≥ 25

SS330 ≥ 205 ≥ 195 ≥ 175 ≥ 165 330 to 430

Diameter, side

or width across

flats of bar

steels,

> 25

No. 14A ≥ 28

180°

2.0 times

the

diameter,

side

or width

across

flats


KS D 3503:2008

4

Table 3 ― Mechanical Properties(continued)


(N/mm2) Bendability


(mm)

Symbol

of

grade

t ≤ 16 16 < t

≤ 40

40 < t

≤ 100 t > 100

Tensile

strength

(N/mm2)

Thickness (t) of

steel product a

(mm)

Test

piece

Elongation

(%) Angle

of

bending

Inside

radius

Thickness of

steel plates and

strip, wide flat

and section

steels

t ≤ 5

No. 5 ≥ 21

Thickness of

steel plates and

strip, wide flat

and section

steels

5 < t ≤ 16

No. 1A ≥ 17

Thickness of

steel plates and

strip, wide flat

and section

steels

16 < t ≤ 40

No. 1A ≥ 21

Thickness of

steel plates,

wide flat

and section

steels

t > 40

No. 4 ≥ 23

180°

1.5 times

the

thickness

Diameter, side

or width across

flats of bar

steels,

≤ 25

No. 2 ≥ 20

SS400 ≥ 245 ≥ 235 ≥ 215 ≥ 205 400 to 510

Diameter, side

or width across

flats of bar

steels,

> 25

No. 14A ≥ 22

180°

1.5 times

the

diameter,

side

or width

across

flats


KS D 3503:2008

5



(N/mm2) Bendability


(mm)

Symbol

of

grade

t ≤ 16 16 < t

≤ 40

40 < t

≤ 100 t > 100

Tensile

strength

(N/mm2)

Thickness (t) of

steel product a

(mm)

Test

piece

Elongation

(%) Angle

of

bending

Inside

radius

Thickness of

steel plates and

strip, wide flat

and section

steels

t ≤ 5

No. 5 ≥ 19

Thickness of

steel plates and

strip, wide flat

and section

steels

5 < t ≤ 16

No. 1A ≥ 15

Thickness of

steel plates and

strip, wide flat

and section

steels

16 < t ≤ 40

No. 1A ≥ 19

Thickness of

steel plates,

wide flat

and section

steels t > 40

No. 4 ≥ 21

180°

2.0 times

the

thickness

Diameter, side

or width across

flats of bar

steels,

≤ 25

No. 2 ≥ 18

SS490 ≥ 285 ≥ 275 ≥ 255 ≥ 245 490 to 610

Diameter, side

or width across

flats of bar

steels,

> 25

No. 14A ≥ 20

180°

2.0 times

the

diameter,

side

or width

across

flats


KS D 3503:2008

6



(N/mm2) Bendability


(mm)

Symbol

of

grade

t ≤ 16 16 < t

≤ 40

40 < t

≤ 100 t > 100

Tensile

strength

(N/mm2)

Thickness (t) of

steel product a

(mm)

Test

piece

Elongation

(%) Angle

of

bending

Inside

radius

Thickness of

steel plates and

strip, wide flat

and section

steels

t ≤ 5

No. 5 ≥ 16

Thickness of

steel plates and

strip, wide flat

and section

steels

5 < t ≤ 16

No. 1A ≥ 13

Thickness of

steel plates and

strip, wide flat

and section

steels

16 < t ≤ 40

No. 1A ≥ 17

180°

2.0 times

the

thickness

Diameter, side

or width across

flats of bar

steels,

≤ 25

No. 2 ≥ 13

SS540 ≥ 400 ≥ 390 - - ≥ 540

Diameter, side

or width across

flats of bar

steels,

> 25

No. 14A ≥ 16

180°

2.0 times

the

diameter,

side

or width

across

flats


KS D 3503:2008

7



(N/mm2) Bendability


(mm)

Symbol

of

grade

t ≤ 16 16 < t

≤ 40

40 < t

≤ 100 t > 100

Tensile

strength

(N/mm2)

Thickness (t) of

steel product a

(mm)

Test

piece

Elongation

(%) Angle

of

bending

Inside

radius

Thickness of

steel plates and

strip, wide flat

and section

steels

t ≤ 5

No. 5 ≥ 14

Thickness of

steel plates and

strip, wide flat

and section

steels

5 < t ≤ 16

No. 1A ≥ 11

Thickness of

steel plates and

strip, wide flat

and section

steels

16 < t ≤ 40

No. 1A ≥ 15

180°

2.0 times

the

thickness

Diameter, side

or width across

flats of bar

steels,

≤ 25

No. 2 ≥ 10

SS590 ≥ 450 ≥ 440 - - ≥ 590

Diameter, side

or width across

flats of bar

steels,

25 < t ≤ 40

No. 14A ≥ 12

180°

2.0 times

the

diameter,

side

or width

across

flats

NOTE For the elongation of No. 4 test piece for steel plates over 90 mm in thickness, it shall be subtracted

1 % from the values of elongation given in Table 3 per each increase of 25.0 mm or its fraction in

thickness. However, the limit to be subtracted shall be within 3 %. a In the case of wide flats, the thickness of steel product means the thickness at the position of which the test

piece(s) is taken as shown in Figure A.1.

In the case of bar steels, the thickness of steel product means the diameter for round bars, the side length

for square bars and width across flats for polygonal bars such as hexagonal bars.


KS D 3503:2008

8

6 Shape, Dimensions, Mass and Tolerances

The shape, dimensions, mass and tolerances thereof shall be in accordance with the following

standards.

KS D 3051, KS D 3052, KS D 3500, KS D 3502

In this case, the width tolerances for the cut-edged steel plate and strip, and length tolerances for the

steel plate strip shall be in accordance with Class A tolerances given in KS D 3500, unless otherwise

specified. The thickness of steel plate, which is not specified in KS D 3500, may be determined by

acceptance, delivery and agreement between the purchaser and supplier.

7 Appearance

Appearance of the steel product shall be in accordance with clause 9 of KS D 3051, clause 10 of KS D

3052, clause 7 of KS D 3500 and clause 9 of KS D 3502.

8 Test

8.1 Chemical Analysis

8.1.1 General Requirements for Chemical Analysis and Sampling Method of Specimen for

Analysis

The chemical composition of the steel product shall be determined by a ladle analysis, and the

general requirements for chemical analysis and sampling methods of specimen for analysis shall be in

accordance with clause 4 of KS D 0001.

8.1.2 Analysis Method

The analysis method shall be in accordance with any one of the following standards:

KS D 1652, KS D 1655, KS D 1659, KS D 1673, KS D 1802, KS D 1803, KS D 1804, KS D 1806

8.2 Mechanical Test

8.2.1 Test in General


KS D 3503:2008

9

General requirements for mechanical testing shall be in accordance with clause 5 of KS D 0001. With

this respect, the sampling method of specimen shall conform to Class A, and the number of test

pieces and the sampling method shall be as follows.

8.2.2 Number of Test Pieces for Tensile and Bending Test

The number of test pieces for tensile and bending test shall be as follows:

a) Steel Plate and Flat steel A test lot shall consist of the steel product from one heat where the

maximum thickness of the steel product is within twice the minimum thickness, and one test piece

shall be taken, respectively. When the mass of one test lot exceeds 50 t, however, two test pieces

shall be taken, respectively. With this respect, if mass of a single steel plate exceeds 50 t, the

number of test piece shall be in one from the single steel plate, respectively.

b) Steel Strip and Cutout Plate thereof A test lot shall consist of the steel product from one heat

rolled to the same thickness, and one test piece shall be taken, respectively. When the mass of

one test lot exceeds 50 t, however, two test pieces shall be taken, respectively.

c) Section Steel A test lot shall consist of the section from one heat rolled to the same sectional

profile group where the maximum thickness of the section is within twice the minimum thickness,

and one test piece shall be taken, respectively. When the mass of one test lot exceeds 50 t,

however, two test pieces shall be taken, respectively.

d) Bar Steel A test lot shall consist of the steel bar from one heat rolled to the same sectional

profile group where the maximum diameter (side length or width across flats) is within twice the

minimum diameter (side length or width across flats), and one test piece shall be taken,

respectively. When the mass of one test lot exceeds 50 t, however, two test pieces shall be taken,

respectively.

e) Number of Test Pieces for Heat-Treated Steel Product The number of test pieces for the heat-

treated steel product shall belong to the same ladle and the same sectional profile group and

shall be in accordance with a), b), c), and d) for each the same heat treating condition.

8.2.3 Sampling Location of Test Piece for Tensile and Bending Test

The sampling location of test pieces for tensile and bending test shall be in accordance with KS D

ISO 377 and may apply Annex A.

The test piece of steel strip may be taken at the location adjacent to an evaluated material portion.

8.2.4 Test Piece The tensile test piece and the bending test piece shall be as follows:


KS D 3503:2008

10

a) No. 1A, 2, 3, 4, 5 or 14A test piece specified in KS B 0801.

b) The bending test piece shall be in accordance with KS B 0804.

8.2.5 Test Method

The methods for tensile and bending test shall be as follows:

a) KS B 0802

b) KS B 0804

8.2.6 Tensile Test for Test Piece Not Having Specified Dimensions

With respect to the tensile test for test piece not having specified dimension, the tensile test and the

test values shall be in accordance with the acceptance, delivery and agreement between the

purchaser and supplier.

8.2.7 Omission of Tensile Test for Steel Strip

The tensile test for the steel strip may be omitted when approved by the purchaser.

9 Inspection

9.1 Inspection

The inspection shall be carried out as follows:

a) General requirements for inspection shall be in accordance with KS D 0001.

b) The chemical composition shall conform to the requirements specified in clause 4.

c) The mechanical properties shall conform to the requirements specified in clause 5.

d) The shape, dimensions and mass shall conform to the requirements specified in clause 6.

e) The appearance shall conform to the requirements specified in clause 7.

9.2 Re-inspection

The steel product which has not passed the tensile test and bending test may be subjected to a

retest according to sub-clause 5.4 of KS D 0001 to determine whether it is acceptable or not.

10 Marking


KS D 3503:2008

11

The steel product which has passed the inspection shall be marked on each piece or each bundle

with the following items by suitable means. However, a part of items may be omitted by the

acceptance, delivery and agreement between the purchaser and supplier.

a) Symbol of grade

b) Ladle number or inspection number

c) Dimensions

d) Quantity or mass of each bundle (for steel plate and steel strip)

e) Manufacturer's name or address

11 Report

The report shall conform to clause 8 of KS D 0001. The manufacturers shall submit an order sheet in

case of an official request. In addition, In case where the NOTE of Table 2 is applied, the content of

added element(s) shall be additively described in the test report.


KS D 3503:2008

12

Annex A

(Normative)

Sampling location of test piece

A.1 Scope

This annex specifies the sampling location of the tensile test piece and bending test piece.

A.2 Sampling location of tensile test piece and bending test piece

The sampling location of the tensile test piece and bending test piece shall be as follows:

a) Steel Plate and Flat Steel The centre of the test piece shall be at a quarter of width from a side

edge, and further in the case of No. 4 test piece, it shall be at a quarter of the thickness. When

the centre is not at a quarter of width from a side edge or at a quarter of the thickness, the centre

of the test piece shall be as near to a quarter as possible.

b) Section Steel The sampling location shall be as shown in Figure A.1. When the sampling location

is not in accordance with Figure A.1, the sampling location shall be as near to that in Figure A.1 as

possible. In the case of the section steel from which a specimen is unable to take in the same

manner as shown in Figure A.1, it shall conform to the sampling position for the I-beam. For other

section steels, it should be in accordance with the acceptance, delivery and agreement between

the purchaser and supplier.


KS D 3503:2008

13

Equal angles Unequal angles Inverted angles

Bulb flats Channels Structural Tees

I-Beam Wide flange shapes

Figure A.1 ― Sampling location of tensile test piece and bending test piece for section steels

－end－


Korean Standards Association http://www.ksa.or.kr

㉿ KS D 3503:2008

KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS

Rolled steels for general structure ICS 77.140.10; 77.140.70


2- ksd3503-rolled steels for general structure

Documents