JIS G 3106 - 2015

3 5 Heat treatment and symbol of heat treatment ···4 5.1 Heat treatment··· 4 5.2 Symbol of heat treatment··· 4 6 Carbon equivalent and weld-crack sensitivity composition··· 4 6.1 Carbon

JIS G 3106: 2015

(JISF)

INDUSTRIAL STANDARD

Translated and Published by Japanese Standards Association

Rolled steels for welded structure

ICS 25.160.01;77.140.01;77.140.10

Date of Establishment: 1952-11-25

Date of Revision: 2015-08-20

Date of Public Notice in Official Gazette: 2015-08-20

Investigated by: Japanese Industrial Standards Committee

Standards Board for ISO area Technical Committee on Metal and Inorganic Materials

JIS G 3106: 2015, First English edition published in 2015-11

Translated and published by: Japanese Standards Association

Mita MT Building, 3-13-12, Mita, Minato-ku, Tokyo, 108-0073 JAPAN

© JSA 2015

In the event of any doubts arising as to the contents, the original JIS is to be the final authority

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

Page

Introduction··· 1

1 Scope ···1

2 Normative references··· 1

3 Classification, symbols and applicable thicknesses ···2

4 Chemical composition 3

5 Heat treatment and symbol of heat treatment ···4

5.1 Heat treatment··· 4

5.2 Symbol of heat treatment··· 4

6 Carbon equivalent and weld-crack sensitivity composition··· 4

6.1 Carbon equivalent and weld-crack sensitivity composition for SM570 ···4

6.2 Carbon equivalent and weld -crack sensitivity composition for steel plates and sheets manufactured by thermo-mechanical control process ···5

7 Mechanical properties· 5

7.1 Yield point or proof stress, tensile strength and elongation ···5

7.2 Charpy absorbed energy··· 6

8 Shape, dimensions, mass and tolerances··· 6

9 Appearance 6

10 Tests··· ···6

10.1 Chemical analysis··· 6

10.2 Mechanical tests··· 8

11 Inspection··· ·10

12 Reinspection ··10

13 Marking ·10

14 Report··· ···11

Annex JA (normative) Chemical composition and tensile properties of steel plates and sheets agreed between the purchaser and the manufacturer ·12

Annex JB (normative) Mechanical properties of sections with side under 40 mm and of flats with width under 40 mm ···14

Annex JC (normative) Quality requirements for hot extruded sections··· ·15

Annex JD (informative) Comparison table between JIS and corresponding International Standards ···19

Foreword

This translation has been made based on the original Japanese Industrial Standard revised by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee

as the result of proposal for revision of Japanese Industrial Standard submitted by The Japan Iron and Steel Federation (JISF) with the draft being attached, based on the provision of Article 12 Clause 1 of the In-dustrial Standardization Law applicable to the case of revision by the provision of Article 14

Consequently JIS G 3106:2008 is replaced with this Standard

However, JIS G 3106:2008 may be applied in the JIS mark certification based on the relevant provisions of Article 19 Clause 1, etc of the Indus-trial Standardization Law until August 19, 2016

This JIS document is protected by the Copyright Law

Attention is drawn to the possibility that some parts of this Standard may conflict with patent rights, applications for a patent after opening to the public or utility model rights The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying any of such patent rights, applications for a patent after opening to the public or utility model rights

Rolled steels for welded structure

Introduction

This Japanese Industrial Standard has been prepared based on the first editions of

ISO 630-1 and ISO 630-2 published in 2011, and the first edition of ISO 630-3

pub-lished in 2012 with some modifications of the technical contents

The portions given continuous sidelines or dotted underlines are the matters in which the contents of the corresponding International Standards have been modified A list of modifications with the explanations is given in Annex JD

1 Scope

This Standard specifies the hot rolled steels and hot extruded sections used for welded structure such as bridges, ships, rolling stock, petroleum storage tanks, con-tainers and other structures with especially high weldability (hereafter referred to as

"steel products")

The quality requirements for hot extruded sections are given in Annex JC

NOTE: The International Standards corresponding to this Standard and the

symbol of degree of correspondence are as follows

ISO 630-1 : 2011 Structural steels - Part 1 : General technical delivery conditions for hot-rolled products

ISO 630-2 : 2011 Structural steels - Part 2 : Technical delivery tions for structural steels for general purposes

condi-ISO 630-3 : 2012 Structural steels - Part 3 : Technical delivery tions for fine-grain structural steels (overall evaluation: MOD)

condi-In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standards and JIS are IDT

(identical), MOD (modified), and NEQ (not equivalent) according to

ISO/lEe Guide 21-1

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this Standard The most recent editions of the standards (in-cluding amendments) indicated below shall be applied

3 Classification, symbols and applicable thicknesses

The steel products are classified into 11 grades, and their symbols and applicable thicknesses are as given in Table 1

Table 1 Symbol of grade and applicable thicknesses

Unit: mm Symbol of Shape of steel product Applicable

SM400A Steel plates/sheets b), steel :::;200

strips in coil, sections and flats SM400B

SM400C Steel plates/sheets b), steel :::;100

strips in coil and sections

SM490A Steel plates/sheets b), steel :::;200

strips in coil, sections and flats SM490B

SM490C Steel plates/sheets b), steel :::;100

strips in coil and sections

SM490YA Steel plates/sheets b), steel :::;100 SM490YB strips in coil, sections and flats

SM520B Steel plates/sheets b), steel :::;100

strips in coil, sections and flats SM520C Steel plates/sheets b), steel :::;100

strips in coil and sections

SM570 Steel plates/sheets b), steel :::;100

strips in coil and sections

Table 1 (concluded)

Notes a) The thickness of sections shall be tor t2 in Table 3,

and t2 in Table 4 of JIS G 3192

b) Upon agreement between the purchaser and the manufacturer, the applicable thickness of steel plate/sheet may be as follows

SM400A : ::;450 SM490A : ::;300 SM400B, SM400C, SM490B and SM490C : ::;250 SM490YA, SM490YB, SM520B, SM520C and SM570 : ::;150

c) Upon agreement between the purchaser and the manufacturer, the applicable thickness of flats may

be as follows

SM400C and SM490C : ::;75 SM520C: ::;50

4 Chemical composition

Steel products shall be tested in accordance with 10.1, and the heat analysis values

shall be as given in Table 2 The heat analysis values of steel products agreed between the purchaser and the manufacturer according to Note b) to Table 1 shall be as given in Table JA.1

Table 2 Chemical composition a)

SM400B ::;50mm ::;0.20 ::;0.35 0.60 to 1.50 ::;0.035 ::;0.035

>50mm ::;0.22 ::;200 mm

SM400C ::;100 mm ::;0.18 ::;0.35 0.60 to 1.50 ::;0.035 ::;0.035

>50mm ::;0.22 ::;200 mm

>50mm ::;0.20 ::;200 mm

Notes a) Alloy elements other than those specified in this table may be added as necessary

b) The thickness of section shall be tor t2 in Table 3, and t2 in Table 4 of JIS G 3192

c) For the value of carbon, the heat analysis value shall be applied

5 Heat treatment and symbol of heat treatment

5.1 Heat treatment

As necessary, steel products may be subjected to normalizing, quenching and pering' or tempering All steel products may be subjected to heat treatment like ther-mo-mechanical control process according to the agreement between the purchaser and the manufacturer (hereafter referred to as "agreement" in 5.2)

tem-5.2 Symbol of heat treatment

When steel products are subjected to heat treatment, the symbol of heat treatment shall be as follows

The symbol of heat treatment, if added, shall be suffixed to the symbol of grade given

in Table 1

a) Normalizing by agreement: N

b) Tempering by agreement: T

c) Quenching and tempering: Q

d) Thermo-mechanical control process on steel products by agreement: TMC

e) Proper heat treatment on steel products by agreement: By agreement

Example: SM490CN, SM570TMC

6 Carbon equivalent and weld -crack sensitivity composition

6.1 Carbon equivalent and weld-crack sensitivity composition for SM570

The carbon equivalent and weld-crack sensitivity composition for SM570 shall be as follows

The carbon equivalent shall apply to quenched and tempered steel products

a) The carbon equivalent shall be determined by formula (1) using the heat analysis values in 10.1, and the value shall be as given in Table 3

Mn Si Ni Cr Mo V

C = C + - + - + - + - + - + - ···-(1)

eq 6 24 40 5 4 14 where, Ceq: carbon equivalent (%)

Table 3 Carbon equivalent

Thickness mm :::;50 > 50:::; 100 >100

Carbon equivalent (%) :::;0.44 :::;0.47 As agreed between the

pur-chaser and the manufacturer

b) The weld -crack sensitivity composition may be applied in place of the carbon equivalent by agreement between the purchaser and the manufacturer In this case, the weld-crack sensitivity composition shall be determined by formula (2) using the heat analysis value in 10.1, and the value shall be as given in Table 4

Si Mn Cu Ni Cr Mo V ( )

P, =C+-+-+-+-+-+-+-+5B ···2

where, P CM : weld·crack sensitivity composition (%)

Table 4 Weld-crack sensitivity composition

Thickness mm :::;50 > 50:::; 100 >100

Weld·crack sensitivity :::;0.28 :::;0.30 As agreed between the

pur-composition % chaser and the manufacturer

6.2 Carbon equivalent and weld-crack sensitivity composition for steel plates and sheets manufactured by thermo-mechanical control process

For steel plates and sheets manufactured by thermo-mechanical control process as agreed between the purchaser and the manufacturer, the carbon equivalent, or alter-natively, the weld-crack sensitivity composition applied by agreement shall be as follows a) Carbon equivalent The carbon equivalent shall be determined by formula (1) of 6.1 using the heat analysis value in 10.1, and the value shall be as given in Table 5

Table 5 Carbon equivalent

Unit: %

Symbol of grade SM490A SM490YA SM520B SM520C

SM490B SM490YB SM490C

Applicable I :::;50 mm :::;0.38 :::;0.40

thickness a) I >50 mm :::; 100 mm :::;0.40 :::;0.42

Note a) The carbon equivalent of steel plate/sheet of thickness over 100 mm

shall be as agreed between the purchaser and the manufacturer

b) Weld-crack sensitivity composition The weld-crack sensitivity composition shall

be determined by formula (2) of 6.1 using the heat analysis value in 10.1 and the value shall be as given in Table 6

Table 6 Weld-crack sensitivity composition

Unit: %

Symbol of grade SM490A SM490YA SM520B SM520C

SM490B SM490YB SM490C

Applicable I :::;50 mm :::;0.24 :::;0.26

thickness a) I >50 mm :::; 100 mm :::;0.26 :::;0.27

Note a) The weld ·crack sensitivity composition of steel plate/sheet of thickness

over 100 mm shall be as agreed between the purchaser and the manu·

facturer

7 Mechanical properties

7.1 Yield point or proof stress, tensile strength and elongation

Steel products shall be tested in accordance with 10.2, and the yield point or proof stress, tensile strength and elongation shall be as given in Table 7 The yield point or proof stress, tensile strength and elongation of steel plate and sheet agreed between the purchaser and the manufacturer as specified in Note b) to Table 1 shall be as given

in Table JA.2 The yield point or proof stress, tensile strength and elongation of tions with a side under 40 mm and of flats with a width under 40 mm shall be as given

sec-in Table JB.1

7.2 Charpy absorbed energy

Steel products of thickness over 12 mm given in Table 8 shall be tested in accordance with 10.2, and the Charpy absorption energy shall be as given in Table 8 In this case, the value of Charpy absorption energy shall be taken from the mean of three test piec-

es and shall be judged by 9.6 of JIS G 0404

8 Shape, dimensions, mass and tolerances

The shape, dimensions, mass and tolerances of steel products shall be in accordance with JIS G 3192, JIS G 3193 and JIS G 3194 In this case, the tolerances on width of steel plate and sheet and cut-edged steel strip in coil as well as the tolerances on length of steel plate and sheet shall be in accordance with tolerance A specified in JIS

G 3193, unless otherwise specified

The chemical analysis shall be as follows

a) General requirements and sampling method General requirements for chemical analysis and the sampling method for heat analysis shall be in accordance with clause 8 of JIS G 0404

b) Analysis method The heat analysis shall be in accordance with JIS G 0320

Table 7 Yield point or proof stress, tensile strength and elongation

Symbol of Yield point or proof stress Tensile strength

SM400A :::: 245 :::: 235 :::: 215 :::: 215 :::: 205 :::: 195 400 to 400 to :::;5 No.5 ::::23

>40 b) No.4 ::::24 SM490A :::: 325 :::: 315 :::: 295 :::: 295 :::: 285 :::: 275 490 to 490 to :::;5 No.5 ::::22

>40 b) No.4 ::::23 SM490YA :::: 365 :::: 355 :::: 335 :::: 325 - - 490 to - :::;5 No.5 ::::19

> 16:::; 50 No.IA ::::19

>40 b) No.4 ::::21 SM520B :::: 365 :::: 355 :::: 335 :::: 325 - - 520 to - :::;5 No.5 ::::19

> 16:::; 50 No.IA ::::19

>40 b) No.4 ::::21 SM570 :::: 460 :::: 450 :::: 430 :::: 420 - - 570 to - :::;16 No.5 ::::19

>20b ) No.4 ::::20 NOTE: 1 N/mm 2 = 1 MPa

Notes a) For sections, the thickness of steel products shall be that of the location of test pieces

b) For the elongation of No.4 test piece of steel product of thickness over 100 mm, tract 1 from the elongation values of this table for each increment of 25 mm or its fraction in thickness However, the subtraction shall not exceed 3

sub-Table 8 Charpy absorbed energy

Symbol of Test tem- Charpy absorbed Test piece grade perature a) energy and

°C sampling direction

J of test pieces SM400B 0 '2:.27

SM400C 0 '2:.47 SM490B 0 '2:.27 SM490C 0 '2:.47 V-notch SM490YB 0 '2:.27 in rolling direction b)

SM520B 0 '2:.27 SM520C 0 '2:.47 SM570 -5 '2:.47 Notes a) The test temperature of a lower value than those specified

in the table may be determined by agreement between the purchaser and the manufacturer

b) When the test is performed in the rolling direction and in the direction perpendicular thereto, the test performed in the rolling direction may be omitted upon approval by the purchaser

10.2 Mechanical tests

10.2.1 General

General requirements for mechanical tests shall be in accordance with clauses 7 and

9 of JIS G 0404 The sampling method shall be in accordance with Class A in 7.6 of JIS

G 0404

10.2.2 Number of test pieces

The number of tensile and impact test pieces shall be as follows

1) Steel plates, sheets and flats Take one tensile test piece from one lot of steel

plate, sheet or flat which belongs to the same heat, and of which the maximum thickness is within two times the minimum thickness When the mass of one lot exceeds 50 t, take two tensile test pieces from each lot When the mass of a steel plate or sheet exceeds 50 t in this case, take one tensile test piece from each steel plate

strip in coil or cut length which belongs to the same heat and of the same ness When the mass of one lot exceeds 50 t, take two tensile test pieces from each lot

same heat rolled to the same sectional profile, and of which the maximum ness is within two times the minimum thickness When the mass of one lot ex-ceeds 50 t, take two tensile test pieces from each lot

product shall be in accordance with 1), 2) and 3), by the same heat and the same conditions of heat treatment

sam-ple from the steel product of maximum thickness which belongs to the same heat For heat treated steel products, take one sample from the steel product which be-longs to the same heat and of the same conditions of heat treatment For sections, however, take a sample from the steel product which belongs to the same heat rolled to the same sectional profile From this sample, take three test pieces in the rolling directions

10.2.3 The location of test pieces

The location of tensile and impact test pieces shall be as follows

prod-ucts shall be in accordance with JIS G 0416 The centre of test pieces across the

width of steel plate or sheet, steel strip in coil and flat shall be at 114 from the edge

of the width or as near to that location as possible

prod-ucts shall be in accordance with JIS G 0416 The centre of test pieces across the

width of steel plate or sheet, steel strip in coil and flat shall be at 114 from the edge

of the width or as near to that location as possible The location of test pieces in thickness of steel plate shall be as shown in Figure A.11 a) of JIS G 0406 for plates

of thickness 28 mm or less, or as shown in Figure A.12 b) of JIS G 0406 for plates of

thickness over 28 mm When the width is not sufficient to take the test piece from the specified location, the location shall be as near to the specified location as pos-sible

10.2.4 Test pieces

The tensile and impact test pieces shall be as follows

a) The tensile test piece shall be one of No lA, 4, 5 and 14B specified in JIS Z 2241

b) The impact test piece shall be V-notch test piece specified in JIS Z 2242 In this

case, the longitudinal axis of the notch shall be perpendicular to the rolled surface

of the product

10.2.5 Test methods

The tensile test and the impact test shall be as follows

a) The tensile test shall be in accordance with JIS Z 2241

b) The impact test shall be in accordance with JIS Z 2242

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11 Inspection

The inspection shall be as follows

a) General requirements for inspection shall be as specified in JIS G 0404

b) The chemical composition shall conform to the requirements of clause 4

c) The carbon equivalent and weld -crack sensitivity composition shall conform to the requirements specified in clause 6

d) The mechanical properties shall conform to the requirements of clause 7

e) The shape, dimensions and mass shall conform to the requirements of clause 8

:0 The appearance shall conform to the requirements of clause 9

12 Reinspection

The reinspection shall be as follows

a) The steel products having failed in the tensile test may be subjected to the retest according to 9.8 of JIS G 0404 for further acceptance judgement

b) The steel products having failed in the impact test specified in 9.6 of JIS G 0404 may be subjected to the retest according to 9.8 of JIS G 0404 for further acceptance judgement

c) The steel products having failed in the mechanical tests may be heat treated or heat treated, then subjected to the mechanical tests again for further acceptance judgement

re-13 Marking

The steel products which have passed the inspection shall be marked on each piece

or each bundle with the following items by suitable means By agreement between the purchaser and the manufacturer, part of the items may be omitted to such extent that the product can be still identified

a) Symbol of grade and symbol of heat treatment specified in 5.2

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h~tw_~~;tJ _t_b&_I>_~r~b_~_~~r _R-n9:_xh~ w~n~J~w_t~r.~x i~ tQ 1;>_~ ~1-!f(~~~_9: t9._Xh~

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b) Heat number or inspection number

c) Dimensions The marking of dimensions shall be in accordance with clause 4 of JIS G 3192, clause 3 of JIS G 3193, and clause 4 of JIS G 3194

d) Quantity or mass of each bundle (for steel plate, sheet and steel strip in coil)

e) Manufacturer's name or its identifying brand