JAPANESE
INDUSTRIAL
STANDARD
Translated and Published by
Japanese Standards Association
JIS G 3125
:2010
(JISF)
Superior atmospheric corrosion
resisting rolled steels
ICS 77.140.10
Reference number: JIS G 3125 : 2010 (E)
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9S
G 3125 : 2010
Date of Establishment: 1971-06-01
Date of Revision: 2010-10-20
Date of Public Notice in Official Gazette: 2010-10-20
Investigated by: Japanese Industrial Standards Committee
Standards Board
Technical Committee on Iron and Steel
JIS G 3125: 2010, First English edition published in 2011-04
Translated and published by: Japanese Standards Association
4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN
In the event of any doubts arising as to the contents,
the original JIS is to be the final authority.
© JSA 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.
Printed in Japan
AT
PROTECTED BY COPYRIGHT
G 3125 : 2010
Contents
Page
Introduction·········································· ...................................................... ·························1
1
Scope················································· ...................................................... ···················1
2
Normative references ...................................................... ········································1
3
Grade, symbol and applicable thickness ...................................................... ········2
4
Chemical composition ...................................................... ·······································2
5
5.1
5.2
Mechanical properties····························································································· 2
Tensile test characteristics .................................................................................... 2
Bendability ............................................................................................................... 3
6
Shape, dimensions, mass and their tolerances ···················································3
7
Oiling················································ ...................................................... ···················4
8
Appearance··············································································································· 4
9
9.1
9.2
Tests ............................................................................................................ ··············4
Chemical analysis ...................................................... ··············································4
Mechanical test ...................................................... ··················································4
10
Inspection and re-inspection ...................................................... ····························6
10.1 Inspection············································ ...................................................... ················6
10.2 Re-inspection ............................................................................................................ 6
11
Marking ..................................................................................................... ················6
12
Report ............................................................................................................ ············7
Annex JA (informative) Comparison table between JIS and corresponding
International Standard ...................................................... ···8
(i)
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G 3125 : 2010
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 Industrial Standardization Law applicable to the case of revision by the provision
of Article 14.
Consequently JIS G 3125: 2004 has been replaced with this Standard.
However, JIS G 3125: 2004 may be applied in the JIS mark certification based on
the relevant provisions of Article 19 Clause 1, etc. of the Industrial Standardization
Law until 19th October, 2011.
This JIS document is protected by the Copyright Law.
Attention is drawn to the possibility that some parts of this Standard may conflict
with a patent right, application for a patent after opening to the public, utility model
right or application for registration of utility model after opening to the public which
have technical properties. The relevant Minister and the Japanese Industrial Standards
Committee are not responsible for identifying the patent right, application for a patent
after opening to the public, utility model right or application for registration of utility
model after opening to the public which have the said technical properties.
(ii)
PROTECTED BY COPYRIGHT
JAPANESE INDUSTRIAL STANDARD
JIS G 3125 : 2010
Superior atmospheric corrosion
resisting rolled steels
In troduction
This Japanese Industrial Standard has been prepared based on the third edition
of ISO 5952 published in 2005 with some modifications of the technical contents.
The portions with continuous sidelines or dotted underlines are the matters in which
the contents of the corresponding International Standard have been modified. A list
of modifications with explanations is given in Annex JA.
1 Scope
This Standard specifies the ----------------------rolled steels (hereafter referred to as "steels") having
high atmospheric corrosion resistance, to be used for vehicles, buildings, steel towers
and other structures.
NOTE 1 The term "atmospheric corrosion resistance" means the property to withstand the corrosion in the atmosphere.
NOTE 2 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows:
ISO 5952: 2005 Continuously hot-rolled steel sheet of structural quality with improved atmospheric corrosion resistance (MOD)
In addition, symbols which denote the degree of correspondence in
the contents between the relevant International Standard and JIS are
IDT (identical), MOD (modified.)", and NEQ (not equivalent) according
to ISO/lEe Guide 21-1.
2
Norma ti ve references
The following standards contain provisions which, through reference in this text,
constitute provisions of this Standard. The most recent editions of the standards
(including amendments) indicated below shall be applied.
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JIS G 0404 Steel and steel products-General technical delivery requirements
___
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JIS G 3141 Cold-reduced carbon steel sheet and strip
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JIS
Z 2201 Test pieces for tensile test for metallic materials
----------------------------------------------------------------------------------------------------------------
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G 3125: 2010
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Metallic materials-Bend test
JIS Z 2248
3
Grade, symbol and applicable thickness
Steels shall be classified into two grades, and their grade symbols and applicable
thicknesses shall be as shown in table 1.
Table 1
Grade, symbol and applicable thickness
Unit: mm
Grade symbol
Steels
Applicable thickness
SPA-H
Hot-rolled steel sheet, strip and section
16 or under
SPA-C
Cold-rolled steel sheet and strip
0.6 or over up to and incl. 2.3
4
Chemical composition
Steels shall be tested in accordance with 9.1 and the resultant heat analysis values
shall satisfy the requirements in table 2. However, if required, alloy elements other
than given in table 2 may be added.
Table 2
Chemical composition
Unit: %
Grade
symbols
SPA-H
SPA-C
Note a)
C
Si
Mn a )
P
S
Cu
Cr
Ni
0.12
max.
0.20 to
0.75
0.60
max.
0.070 to
0.150
0.035
max.
0.25 to
0.55
0.30 to
1.25
0.65
max.
The upper limit of Mn may be 1.0 % max. by agreement between the purchaser and the
manufacturer. For sections, the upper limit of Mn may be agreed between the purchaser
and the manufacturer.
5 Mechanical properties
5.1
Tensile test characteristics
Steels shall be tested in accordance with 9.2 and the tensile test characteristics of
the steel shall comply with table 3.
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3
G 3125: 2010
Table 3
Grade
symbols
Tensile test characteristics
Division
Yield point or
proof stress
Tensile
strength
Tensile
test piece
Elongation
N/mm 2
N/mm 2
Steel sheet and strip 6.0 mm
or under in thickness
355 min.
490 min. a)
No.5
22
Sections, steel sheet and strip
over 6.0 mm in thickness
355 min.
490 min.
No.1A
15
-
315 min.
450 min.
No.5
26
%
SPA-H
SPA-C
2
NOTE: 1 N/mm = 1 MPa
Note a) For SPA-H steel sheet and strip of less than 3 mm thickness, 510 N/mm 2 or over
may be applied by agreement between the purchaser and the manufacturer.
5.2
Bendabili ty
For bendability, the steel shall be tested according to 9.2 under the bend test conditions in table 4, and no cracks shall be observed on the outside of the test piece.
NOTE:
For details of the bend test, refer to 9.2.3.
Table 4
Grade
symbols
Bendability
Division
Bendability
Bend angle
Inside radius or
internal spacing a)
Steel sheet and strip 6.0 mm
or under in thickness
180 0
0.5 b) x thickness
Sections, steel sheet and strip
over 6.0 mm in thickness
180 0
1.5 x thickness
-
180 0
1 x thickness
Test piece
No.1
SPA-H
SPA-C
In accordance
with 9.2.3 b) 1)
Notes a)
The internal spacing shall apply to SPA-C. This value is the upper limit value,
and so the test piece shall be bent so as not to exceed this value.
b)
For SPA-H steel sheet and strip of 6.0 mm or under in thickness, the inside radius
may be 1.0 times the thickness upon agreement between the purchaser and the
man ufacturer.
6
Shape, dimensions, mass and their tolerances
The shape, dimensions, mass and their tolerances of the steels shall comply with
JIS G 3192, JIS G 3193 or JIS G 3141. However, tolerance A shall be applied to
the length of the steel sheet and strip of SPA-H and to the width of cut edge steel, and
to the thickness, width, length and flatness of SPA-C, unless otherwise specified. The
flatness of SPA-C shall be flatness A unless otherwise specified.
In addition, the squareness of the steel sheet of SPA-H and SPA-C shall be in accordance with the following method which uses diagonal lines. However, in case of
any doubt arising, the method given in JIS G 3193 or JIS G 3141 shall be applied.
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G 3125: 2010
Obtain 1/2 of the absolute value of the difference (IX1 -X2 1/2) between lengths of two
diagonal lines (Xl and X2 of figure 1), and this value shall not exceed 0.7% of the actual width W of the sheet.
L (Length)
W (Actual width)
Figure 1
7
Squareness of steel sheet (method using diagonal lines)
Oiling
Oiling shall be as follows unless otherwise specified:
a)
Steel sheet and strip of SPA-H of which the scale generated by rolling has been
removed, and steel sheet and strip of SPA-C shall be oiled.
b)
As-rolled steel sheet, strip and sections of SPA-H shall not be oiled.
8------------------------------Appearance
Appearance of steels shall comply with JIS G 3192, JIS G 3193 or JIS G 3141.
9
Tests
9.1
Chemical analysis
The chemical analysis shall be as follows:
a)
The general matters of the analysis and the sampling method shall be in accordance with clause 8 of JIS G 0404.
b)
The method of analysis shall be in accordance with JIS G 0320.
9.2
Mechanical test
9.2.1
General matters of mechanical test
The general matters of mechanical test shall be in accordance with clause 7 and
clause 9 of JIS G 0404. In this case, the method of sampling position shall be Type A
of 7.6 of JIS G 0404, and the number of test pieces shall be as follows:
Number of test pieces for tensile and bend tests
a)
1)
Hot-rolled steel sheet One test piece shall be taken from each lot of steel
sheets of the same heat with the maximum thickness not more than two times
the minimum thickness. However, if the lot exceeds 50 t in mass, two test pieces
shall be taken.
2)
Hot-rolled steel strip and cut plates from strip One test piece shall be
taken from each lot of the same heat and the same thickness. However, if the
lot exceeds 50 t in mass, two test pieces shall be taken.
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G 3125: 2010
3)
Hot-rolled sections One test piece shall be taken from each lot of the same
heat and the same shape with the maximum thickness not more than two times
the minimum thickness. However, if the lot exceeds 50 t in mass, two test pieces
shall be taken.
4)
Cold-rolled steel sheet and strip One test piece shall be taken from each
lot of the same heat, the same thickness, the same rolling and the same heat
treatment conditions. However, if the lot exceeds 50 t in mass, two test pieces
shall be taken.
Sampling position of tensile and bend test pieces
Annex A of JIS G 0416.
b)
Perform according to
9.2.2 Tensile test pieces and test method
The tensile test shall be as follows:
a)
Test pieces to be used shall be in accordance with No. 1A or No.5 test piece of JIS
Z 2201.
b)
The test method shall be in accordance with JIS Z 2241.
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The bend test shall be as follows:
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Note
1)
The test may be omitted by the judgment of the manufacturer, but the
--------------------------------------------------------------------------------------------------------------------------------------------------bendability requirements should still be satisfied.
In the case of SPA-H
a)
1)
Test piece to be used shall be in accordance with No.1 test piece in JIS Z 2248.
2)
The test method shall be in accordance with JIS Z 2248.
--------------------------------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------
In the case of SPA-C
b)
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2)
0
For bending the test piece, use a manual vice to bend the test piece through 180
in
the longitudinal direction under the conditions in table 4 as shown in figure 2.
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ducted by other appropriate methods.
----------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------------------------
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G 3125: 2010
Figure 2
Direction of bending test
10 Inspection and re-inspection
10.1 Inspection
The inspection shall be as follows:
a)
Chemical composition shall conform to clause 4.
b)
Mechanical properties shall conform to clause 5.
c)
Shape, dimensions and mass shall conform to clause 6.
d)
Appearance shall conform to clause 8.
e)
If tensile test piece of the specified dimensions can not be obtained, the test procedure, specification value, or other matters shall be as agreed between the purchaser and the manufacturer.
10.2 Re-inspection
The steels having failed in the mechanical test may be retested according to 9.8 of
JIS G 0404 for further judgment of acceptance.
11 Marking
The steels which have passed the inspection shall be clearly marked with the following items on each product or bundle in a suitable manner. The items below, however, may be partially omitted with the agreement between purchaser and
manufacturer.
a)
Grade symbol
b)
Heat number or inspection number
c)
Dimensions
d)
Manufacturer's name or its abbreviation
e)
Quality or mass of each bundle in the case of steel sheet or strip
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G 3125: 2010
12 Report
The report shall comply with clause 13 of JIS G 0404. Unless otherwise specified
by the purchaser at the order, the report shall be in accordance with symbol 2.3 or symbol 3.1.B specified in table 1 of JIS G 0415.
If any alloy element other than specified in table 2 was added, the inspection document shall state the content of the added element.
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OCXl
Annex JA (informative)
W
Comparison table between JIS and corresponding International Standard
I---l
~
01
~
JIS G 3125: 2010 Superior atmospheric corrosion resisting rolled steels
ISO 5952: 2005 Continuously hot-rolled steel sheet of structural
quality with improved atmospheric corrosion resistance
(I) Requirements in JIS
(III) Requirements in International Standard
(IV) Classification and details of
technical deviation between JIS and
the International Standard by clause
Clause
No.
Content
Classification by
clause
Detail of technical
deviation
Addition
JIS specifies sections,
steel sheet and strip,
whereas ISO does not
specify sections.
Deviation is due to difference of structure between
JIS and ISO. No change
is made at this time regarding this matter.
Deletion
JIS specifies one grade
selected from ISO
grades.
JIS specifies three steel
grades with use performances from ISO grades
in JIS G 3125 and JIS
G 3114. Addition of
grades requires sufficient
use performances and no
change is made at this
time regarding this
matter.
(II) International
Standard
number
No. and title of
clause
Content
1 Scope
This Standard specifies
the rolled steel having
high atmospheric corrosion resistance, to be
used for vehicles, buildings, steel towers and
other structures.
1
This International
Standard applies to
continuously hotrolled steel sheet of
structural quality
having improved atmospheric corrosion
resistance, also
known as weatherresistant structural
steel.
Two steel grades and
applicable thicknesses
are specified.
1.1
Five steel grades are
specified.
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(V) Justification for the
technical deviation and
future measures
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references
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and applicable
thickness
Alteration
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(I) Requirements in JIS
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(II) International
Standard
number
(III) Requirements in International Standard
(IV) Classification and details of
technical deviation between JIS and
the International Standard by clause
Clause
No.
Content
Classification by
clause
Detail of technical
deviation
No. and title of
clause
Content
4 Chemical
composition
Heat analysis values
are specified.
5.2
Heat analysis values
are specified.
Alteration
Compositions given in
JIS and ISO are approximately the same,
except for the lower
limit value of S.
The difference of the
lower limit value of S is
small and insignificant.
No change is made at
this time regarding this
matter.
5 Mechanical
properties
The tensile strength,
proof stress and elongation and bendability
are specified.
5.6
The tensile strength,
proof stress and elongation are specified.
The impact test is
specified as an additional test.
Deletion
JIS deletes the impact
test, while adding the
bend test.
The impact test is not
necessary in JIS in view
of usage of the product.
No change is made at
this time regarding this
matter.
6 Shape, dimensions, mass and
their tolerances
Shape, dimensions,
mass and tolerances of
steel sections, steel
sheet and strip are
specified.
6
Shape, dimensions
and tolerances of section, steel sheet and
strip are specified.
Addition
JIS adds the specification of sections.
Deviation is due to the
difference of structure
between JIS and ISO.
No change is made at
this time regarding this
matter.
7 Oiling
Oiling is specified.
4.2
Oiling is specified.
Identical
8 Appearance
Appearance of steel
sections, steel sheet
and strip is specified.
11
Appearance of steel
sheet and strip is
specified.
Addition
JIS adds the specification of sections.
Deviation is due to the
difference of structure
between JIS and ISO.
No change is made at
this time regarding this
matter.
9.1 Chemical
analysis
Sampling method and
analysis method are
specified.
5.3
It is specified that a
heat analysis be conducted.
Addition
JIS specifies the analysis in more details.
Deviation is due to the
difference of structure
between JIS and ISO.
No change is made at
this time regarding this
matter.
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(I) Requirements in JIS
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(II) International
Standard
number
(III) Requirements in International Standard
Classification by
clause
Detail of technical
deviation
7
Sampling method and
testing method of
tensile test, and impact testing method
are specified.
Addition
JIS adds the bend test.
Deletion of bend test
specification from JIS
will be considered.
Inspection prior to
shipment by the inspector is specified.
Alteration
The manufacturer shall
judge the test results in
JIS.
JIS leaves the inspection
to the manufacturer's
responsibility. No
change is made at this
time regarding this
matter.
9
Retests are specified.
Identical
10
It is specified that the
manufacturer may
resubmit the products
rejected.
Five marking items are
specified.
14
Seven marking items
are specified.
Deletion
JIS does not specify
markings of standard
number and order number.
JIS grade symbols indicate the standard number, so the marking of
standard number is not
necessary. Order number
is a matter of individual
contracts, therefore its
marking on the product is
unnecessary.
Report and inspection
document are specified.
-
-
Addition
9.2 Mechanical
test
Test pieces and testing
methods of tensile and
bend test are specified.
10.1 Inspection
Inspections of chemical
composition, mechanical properties, shape,
mass and appearance
are specified.
12
10.2 Re-inspection
Re-inspection is specified.
11 Marking
12 Report
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technical deviation and
future measures
Clause
No.
No. and title of
clause
~
(IV) Classification and details of
technical deviation between JIS and
the International Standard by clause
o
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o
Deviation is due to the
difference of structure
between JIS and ISO.
No change is made at
this time regarding this
matter.
(I) Requirements in JIS
No. and title of
clause
Content
-
-
(II) International
Standard
number
(III) Requirements in International Standard
(IV) Classification and details of
technical deviation between JIS and
the International Standard by clause
Clause
No.
Content
Classification by
clause
Detail of technical
deviation
3
Definitions: relevant
terms are defined.
Deletion
No specification in JIS.
The terms are defined in
JIS G 0203.
5.1
Steelmaking is specified.
Deletion
No specification in JIS.
The steelmaking is not
generally specified in
JIS. Deviation is due to
the difference of structure between JIS and
ISO, and no change is
made at this time regarding this matter.
13
It is specified that at
the time of ordering
coils, diameters and
mass of coils are to be
designated.
Deletion
No specification in JIS.
In JIS, these are considered to be matters of
individual business contracts and are not to be
specified in standards.
15
Information to be
supplied by the purchaser is specified.
Deletion
No specification in JIS.
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technical deviation and
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Overall degree of correspondence between JIS and International Standard (ISO 5952: 2005): MOD
NOTE 1 Symbols in sub-columns of classification by clause in the above table indicate as follows:
Identical: Identical in technical contents.
Deletion: Deletes the specification item(s) or content(s) of International Standard.
Addition: Adds the specification item(s) or content(s) which are not included in International Standard.
Alteration: Alters the specification content(s) which are included in International Standard.
NOTE 2 Symbol in column of overall degree of correspondence between JIS and International Standard in the above table indicates as follows:
-
MOD: Modifies International Standard.
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Errata for JIS (English edition) are printed in Standardization and Quality Control, published
monthly by the Japanese Standards Association, and also provided to subscribers of JIS (English edition) in Monthly Information.
Errata will be provided upon request, please contact:
Standards Publishing Department, Japanese Standards Association
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