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GB/T 32255-2015 English PDF (GBT32255-2015)

GB/T 32255-2015 English PDF (GBT32255-2015)

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GB/T 32255-2015: General martensitic stainless steel and alloy steel castings suitable for high temperature and high pressure service

This standard specifies the technical requirements, test methods, inspection rules, marking, storage, packing and transportation requirements for General martensitic stainless steel and alloy steel castings suitable for high temperature and high pressure service.
GB/T 32255-2015
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 77.140.80
J 31
General martensitic stainless steel and
alloy steel castings suitable for
high temperature and high pressure service
ISSUED ON. DECEMBER 10, 2015
IMPLEMENTED ON. JULY 01, 2016
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 Technical requirements ... 6
4 Test methods ... 10
5 Inspection rules ... 11
6 Marking, storage, packaging and transportation... 14
Appendix A (Informative) Comparison between the casting steel designation of this standard and BSEN 10213.2007, ASTM A217-2012 ... 15
APPENDIX B (Informative) Strength of general martensitic stainless steel and alloy steel castings suitable for high temperature and high pressure service at different temperatures ... 16
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by AND shall be under the jurisdiction of National Foundry Standardization Technical Committee (SAC/TC 54).
The drafting organizations of this standard. China Nuclear Valve Factory Hengdian Machinery Co., Ltd., Shanghai Honggang Power Equipment Casting and Forging Co., Ltd., Chinese Academy of Sciences Institute of Metal
Research, Anhui Yingliu Group Huoshan Casting Co., Ltd., KOCEL Cast Steel Co., Ltd. Shenyang Casting Research Institute.
The main drafters of this standard. Liu Xiaodong, Wu Tieming, Hu Xiaoqiang, Du Yingliu, Tang Zhongxue, Gu Lili, Ma Jin, Yu Bo.
General martensitic stainless steel and
alloy steel castings suitable for
high temperature and high pressure service
1 Scope
This standard specifies the technical requirements, test methods, inspection rules, marking, storage, packing and transportation requirements for General martensitic stainless steel and alloy steel castings suitable for high temperature and high pressure service.
This standard is applicable to cast valves, flanges, and pipe fittings used at working temperature not higher than 600 ??C; AND other castings for high temperature and high pressure service may refer to this standard.
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 223.4 Alloyed steel - Determination of manganese content -
Potentiometric or visual titration method
GB/T 223.5 Method for chemical analysis of iron, steel and alloy - The
reduced molybdosilicate spectrophotometric method for the determination of acid-soluble silicon content
GB/T 223.9 Iron, steel and alloy - Determination of aluminum content ?€?
Chrom azurol S spectrophotometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visible titration or potentiometric titration method
GB/T 223.14 Method for chemical analysis of iron, steel and alloy - The N- Benzoy-N-Phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.36 Method for chemical analysis of iron, steel and alloy ?€? The neutral titration method for the determination of nitrogen content after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the Chlorosulfonol S spectrophotometric method
GB/T 223.43 Iron, steel and alloy - Determination of tungsten content - Gravimetric method and spectrophotometric method
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.67 Iron, steel and alloy - Determination of sulfur content -
Methylene blue spectrophotometric method
GB/T 223.69 Iron, steel and alloy - Determination of carbon - Gas-volumetric method after combustion in pipe furnaces
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 4336 Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric (Routine method) GB/T 5677 Radiographic testing for steel castings
GB/T 6060.1 Roughness comparison specimens - Cast surfaces
GB/T 6414 Castings - System of dimensional tolerance and machining
allowances
GB/T 7233.2 Steel castings - Ultrasonic examination - Part 2. Steel castings for highly stressed components
3.7.3 The welders undertaking welding repair work shall have corresponding qualifications.
3.7.4 Unless otherwise agreed by the supplier and the buyer, if the depth of the welding groove (pit) exceeds 40% of the wall thickness OR 25 mm (whichever is the less), it belongs to major welding repair, which shall be agreed in advance by the buyer, AND be with such records as welding conditions, welding repair location, scope and so on.
3.7.5 It shall select suitable welding consumables AND finish the welding procedure assessment, before welding. As for the casting to be subjected to major welding repair, it shall be subjected to post-weld heat treatment. 3.7.6 After welding repair, the castings shall be inspected in accordance with the same standard for castings inspection.
3.8 Correction
If the castings have deformation, it is allowed to correct it; AND the corrected castings shall be subjected to stress relief treatment.
4 Test methods
4.1 Chemical analysis
4.1.1 Chemical composition arbitration analysis method shall be in accordance with GB/T 223.4, GB/T 223.5, GB/T 223.9, GB/T 223.11, GB/T 223.14, GB/T 223.23, GB/T 223.26 , GB/T 223.36, GB/T 223.40, GB/T 223.43, GB/T 223.59, GB/T 223.67, and GB/T 223.69.
4.1.2 Spectral analysis shall be conducted in accordance with the provisions of GB/T 4336.
4.2 Mechanical properties test
4.2.1 Tensile test shall be conducted in accordance with GB/T 228.1.
4.2.2 The impact test shall be conducted in accordance with the provisions of GB/T 229.
4.3 Non-destructive testing
4.3.1 Unless otherwise specified, the casting surface magnetic particle testing shall be conducted in accordance with the provisions of GB/T 9444.
sample?€?s impact value to be below the value as specified in Table 2, BUT it shall not be less than 2/3 of the specified value.
5.2.6 The test results of mechanical properties that do not meet the specified requirements are considered to be invalid for the following reasons.
a) The sample is not properly installed OR the test machine is not functioning properly;
b) The tensile test sample breaks apart beyond the gauge length;
c) Improper sample preparation;
d) There is an abnormality in the sample.
In the case of one of the above cases, it shall take sample from the same test block (casting) or another test block (casting) of same batch to conduct test again, AND the test results can replace the bad test results.
5.2.7 Where the results of the mechanical properties test are not satisfactory AND are not due to the reasons listed in 5.2.6, it is allowed to use the standby sample from the same furnace to conduct re-test. As for the tensile test, TAKE 2 samples for re-test; if the test results of the both samples are qualified, this tensile test can be judged as qualified; otherwise it is not qualified. As for the impact test, TAKE 3 samples for re-test; if the test results of the 3 samples are qualified, AND the arithmetic mean value of the 6 samples (3 for initial test and 3 for re-test) is also qualified, the impact test results can be judged as qualified; otherwise it is not qualified.
5.2.8 When the results of the mechanical properties re-test still do not meet the requirements in Table 2, it is allowed to make the castings and test pieces be subjected to heat treatment again, AND then conduct re-test in accordance with 5.2.4 or 5.2.5. Unless otherwise agreed by the buyer, the number of re-heat treatment shall not exceed 2 (except for tempering).
5.3 Appearance quality
The appearance quality of the castings shall be inspected in accordance with 3.5 one by one.
5.4 Non-destructive testing
In accordance with the ordering requirements of the buyer, the casting can be subjected to penetration, magnetic particle, ultrasonic or radiographic testing. The required testing methods, location and acceptance criteria shall be agreed upon between the supplier and the buyer.

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