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GBT19879-2015

Chinese Standard: 'GBT19879-2015'
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GB/T 19879-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 19879-2005
Steel plate for building structure
建筑结构用钢板
ISSUED ON. DECEMBER 10, 2015
IMPLEMENTED ON. NOVEMBER 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Grade representation ... 7 
4 Order contents ... 8 
5 Dimension, shape, weight and tolerance ... 8 
6 Technical requirements ... 8 
7 Test methods ... 16 
8 Inspection rules ... 16 
9 Packaging, symbols and quality certificate ... 17 
10 Rounding off for numerical values ... 17 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 19879-2005 Steel plate for building structure.
Compared with GB/T 19879-2005, the major technical changes are as follows.
— ADD the grades for the steel of high strength, namely Q500GJ, Q550GJ,
Q620GJ and Q690GJ, and corresponding technical requirements.
— ADD Level B to the quality levels Q390GJ, Q420GJ and Q460GJ.
— EXPAND the maximum thickness of Q345GJ steel plates from 100mm to
200mm. EXPAND the maximum thickness of Q235GJ, Q390GJ, Q420GJ
and Q460GJ steel plates from 100mm to 150mm.
— S content of Levels D and E steel is tightened from S ≤ 0.015% to S ≤
0.010%.
— STIPULATE the carbon equivalent (CEV) and welding crack susceptibility
index (Pcm) values of Q460GJ.
— Clearly EXPRESS the yield strength as lower yield strength Rel.
— DECREASE the thickness effect for the yield strength of the steel plates
with the thicknesses of not greater than 100mm from 20MPa to 10MPa.
— Respectively ADJUST the yield ratios of Q345GJ, Q390GJ, Q420GJ and
Q460GJ from not greater than 0.83, 0.85, 0.85 and 0.85 to not greater
than 0.80, 0.83, 0.83 and 0.83.
— REDUCE the yield strength range of Q235GJ and Q345GJ from 120MPa
to 110MPa.
— INCREASE the percentage elongation after fracture of Q420GJ from not
less than 19% to not less than 20%. INCREASE the percentage
elongation after fracture of Q460GJ from not less than 17% to not less
than 18%.
— INCREASE the minimum impact energy absorption value of Q235GJ,
Q345GJ, Q390GJ, Q420GJ and Q460GJ from 34J to 47J.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Technical
Committee for Standardization of Steels (SAC/TC 183).
Steel plate for building structure
1 Scope
This Standard specifies the grade representation, order contents, dimension,
shape, weight, tolerance, technical requirements, test methods, inspection
rules, packaging, symbols and quality certificate of the steel plates for building
structure.
This Standard is applicable to the Q345GJ hot-rolled steel plates within the
thickness range of 6mm to 200mm, Q235GJ, Q390GJ, Q420GJ and Q460GJ
hot-rolled steel plates within the thickness range of 6mm to 150mm, Q500GJ,
Q550GJ, Q620GJ and Q690GJ hot-rolled steel plates within the thickness
range of 12mm to 40mm for manufacturing high-rise building structure, long-
span structure and other important building structures (hereinafter referred to
as “steel plates”).
Hot-rolled steel plates can also make reference to this Standard.
2 Normative references
The following documents are essential to the application of this document. For
dated references, only the editions with the dates indicated are applicable to
this document. For undated references, only the latest editions (including all the
amendments) are applicable to this document.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total
silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron, steel and alloy - Determination of aluminium content -
Chrom azurol S photometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content -
Visual titration or potentiometric titration method
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-
benzoyl-N-phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.19 Methods f......
Related standard:   GB/T 19855-2015  GB/T 30645-2014
   
 
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