GB/T 28909-2012 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 28909-2012 | English | 70 |
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Extra-high strength structural steel plates in the heat-treatment condition
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GB/T 28909-2012: Extra-high strength structural steel plates in the heat-treatment condition---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT28909-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Extra-high strength structural steel plates
in the heat-treatment condition
Issued on. NOVEMBER 05, 2012
Implemented on. MAY 01, 2013
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Order content... 7
4 Representation of designation... 7
5 Size, shape, weight and allowable deviation... 8
6 Technical requirements... 8
7 Test methods... 11
8 Inspection rules... 12
9 Numerical round-off... 12
10 Packaging, marking and quality certificate... 12
Appendix A (Informative) Reference values of carbon equivalent... 13
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
Drafting organizations of this standard. Jinan Iron & Steel Group Co., Ltd.,
Anshan Iron & Steel Co., Ltd., Hunan Hualing Xiangtan Iron & Steel Co., Ltd.,
Metallurgical Industry Information Standards Institute, Shougang Corporation.
The main drafters of this standard. Sun Weihua, Zhang Dianying, Gao Ling,
Wang Xiaohu, Liu Xuyuan, Li Xiaoli, Shi Li, Wang Jiangwei, Hu Shue, Chao
Feiyan, Feng Yong.
Extra-high strength structural steel plates
in the heat-treatment condition
1 Scope
This standard specifies the ordering content, designation indication method,
size, shape, weight and allowable deviation, technical requirements, test
methods, inspection rules, packaging, marking and quality certificate of extra-
high strength structural steel plates in the heat-treatment condition.
This standard is applicable to steel plates with a thickness of not more than 50
mm for construction machinery such as mines, buildings and agriculture.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of steels and alloys -
Determination of phosphorus content by diantipyryl methane
phosphomolybdate gravimetric method
GB/T 223.9 Iron steel and alloy - Determination of aluminum 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 223.12 Methods for chemical analysis of iron, steel and alloy - The
sodium carbonate separation-diphenyl carbazide photometric method for the
determination of chromium content
GB/T 223.13 Methods for chemical analysis of iron, steel and alloy - The
ammonium ferrous sulfate titration method for the determination of vanadium
content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-
Benzoy-N-Phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.17 Methods for chemical analysis of steels and alloy - The
diantipyrylmethane photometric method for the determination of titanium
content
3 Order content
The purchaser shall provide at least the following information when ordering.
4 Representation of designation
The steel designation consists of three parts. the Chinese pinyin letters
representing the yield strength, the lower limit value of the specified yield
strength, the quality grade symbol. For example. Q1200D, wherein.
5 Size, shape, weight and allowable deviation
5.1 Unevenness
5.1.1 The unevenness of the steel plate shall comply with the requirements of
Class N in Table 1.Through negotiation between the supplier and the purchaser
and as indicated in the contract, the unevenness may also be in accordance
with the provisions of the Class S in Table 1.
5.1.3 When the waveform spacing (the distance between the ruler and the
contact point of the steel plate) is 300 mm ~ 1000 mm, for the Class N
unevenness, the maximum allowable value of the unevenness is 1.5% of the
waveform spacing, and does not exceed the value specified in Table 1; for the
Class S unevenness, the maximum allowable value of the unevenness is 1%
of the waveform spacing, and does not exceed the value specified in Table 1.
5.3 Through negotiation between the supplier and the purchaser, it may also
supply the steel plates of other sizes, shapes, weights and allowable deviations.
6 Technical requirements
6.1 Designation and chemical composition
6.1.1 The designation and chemical composition of the steel (melting analysis)
6.1.1.4 According to the user’s requirements, through negotiation between the
supplier and the purchaser, it may specify the carbon equivalent of each
designation. The carbon equivalent is calculated according to formula (1)
(Appendix A lists the reference value of carbon equivalent).
6.1.2 The allowable deviation of the chemical composition of the finished steel
plate shall comply with the provisions of GB/T 222.
6.2 Smelting method
The steel is smelted by a converter or an electric furnace, refined outside the
furnace.
6.4 Mechanical properties
6.4.1 The mechanical properties of the steel plate shall comply with the
requirements of Table 3.
6.5 Surface quality
6.5.1 The surface of steel plates shall be free from cracks, air bubbles, crusting,
folding, inclusions, or other defects. The steel plate shall not be delaminated. If
the above surface defects present, they are allowed to be removed, the depth
6.5.2 The surface of the steel plate is allowed to have a thin-layer of iron oxide
scale, rust, surface roughness caused by the falling of the iron oxide scale,
scratches, indentations or other local defects, that do not hinder the inspection
of surface defects, but the depth shall not exceed half of the thickness tolerance,
meanwhile it shall ensure the minimum thickness of the steel plate.
6.5.3 Steel plates are not allowed to weld-repair.
6.6 Ultrasonic testing
If required by the manufacturer, the steel plate can be ultrasonically tested piece
by piece, the test method shall follow the provisions of GB/T 2970.Through
negotiation between the supplier and the purchaser, it may also use other
testing criteria, the specific testing criteria and qualification grade shall be
indicated in the contract.
7 Test methods
The inspection items, sampling quantities, sampling methods and test methods
of the steel plates shall comply with the requirements of Table 4.
8 Inspection rules
8.1 The acceptance of the steel plate shall be carried out by the technical
supervision department of the supplier.
8.2 Steel plates shall be accepted in batches. Each batch shall consist of steel
plates of the same designation, the same heat number, the same thickness, the
same heat treatment system. The weight of each batch shall not exceed 40 t.
9 Numeric round-off
The numeric round-off shall comply with the provisions of YB/T 081.
10 Packaging, marking and quality certificate
The packaging, marking and quality certificate of the steel plate shall comply
with the provisions of GB/T 247.
Appendix A
(Informative)
Reference values of carbon equivalent
The reference values of carbon equivalent are as shown in Table A.1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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