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GB/T 28909-2012 English PDF (GBT28909-2012)

GB/T 28909-2012 English PDF (GBT28909-2012)

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GB/T 28909-2012: Extra-high strength structural steel plates in the heat-treatment condition

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 extrahigh 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.
GB/T 28909-2012
GB
NATIONAL STANDARD OF THE
PEOPLE 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 and Steel Group Co., Ltd., Anshan Iron and Steel Co., Ltd., Hunan Hualing Xiangtan Iron and 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
sulfur content
GB/T 223.69 Iron, steel and alloy - Determination of carbon contents - Gas- volumetric method after combustion in the pipe furnace
GB/T 223.71 Methods for chemical analysis of iron, steel and alloy - The gravimetric method after combustion in the pipe furnace for the
determination of carbon content
GB/T 223.72 Iron, steel and alloy - Determination of sulfur content -
Gravimetric method
GB/T 223.75 Iron steel and alloy - Determination of boron content - Methanol distillation-curcumin photometric method
GB/T 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of
vanadium content
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy -
Curcumin spectrophotometric method for the determination of boron content GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 247 General rule of package mark and certification for steel plates (sheets) and strips
GB/T 709 Dimension, shape, weight and tolerances for hot rolled sheets and strips
GB/T 2970 Thicker steel plates - Method for ultrasonic inspection
GB/T 2975 Steel and steel products - Location and preparation of test pieces for mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 14977 General requirement for surface condition of hot-rolled steel plates
GB/T 17505 Steel and steel products - General technical delivery
requirements
GB/T 20066 Steel and iron - Sampling and preparation of samples for the of removal shall be calculated from the actual size of the steel plate, it shall not exceed half of the thickness tolerance of the steel plate, meanwhile it shall ensure the minimum thickness of the steel plate. The defect removal area shall be smooth and free of edges and corners.
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.
6.5.4 Except for the provisions on weld-repair, through negotiation between the supplier and the purchaser and as indicated in the contract, the surface quality shall comply with the provisions of GB/T 14977.
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.
6.7 Through negotiation between the supplier and the purchaser, it may put forward to other special requirements for the steel plate.
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.
Table 4
No. Inspection item Sampling quantity/piece
Sampling
method Test methods
1 Chemical composition 1/furnace GB/T 20066 GB/T 223, GB/T 4336, GB/T 20123, GB/T 20125, GB/T 20126 2 Tension 1/batch GB/T 2975 GB/T 228.1
3 Impact 3/batch GB/T 2975 GB/T 229
4 Size, shape Piece by piece - Measuring tool complying with accuracy requirements 5 Surface Piece by piece - Visual inspection
6 Ultrasonic testing Piece by piece - GB/T 2970

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