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GB/T 7659-2010 English PDF (GBT7659-2010)

GB/T 7659-2010 English PDF (GBT7659-2010)

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GB/T 7659-2010: Steel casting suitable for welded structure

This Standard specifies the designation, technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage requirements of steel casting suitable for welded structure. This Standard is applicable to steel casting with good weldability for general engineering structures.
GB/T 7659-2010
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.80
J 31
Replacing GB/T 7659-1987
Steel casting suitable for welded structure
ISSUED ON: DECEMBER 23, 2010
IMPLEMENTED ON: JUNE 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Designation ... 6
4 Technical requirements ... 6
5 Test methods ... 8
6 Inspection rules ... 9
7 Marking, packaging, transportation, storage ... 11
Appendix A (Normative) Provisions on carbon equivalent ... 13
Steel casting suitable for welded structure
1 Scope
This Standard specifies the designation, technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage requirements of steel casting suitable for welded structure.
This Standard is applicable to steel casting with good weldability (hereinafter referred to as casting) for general engineering structures.
2 Normative references
The following documents contain the provisions which, through reference in this Standard, become the provisions of this Standard. For the dated references, their subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest editions of these documents are applicable. For undated reference documents, the latest
editions apply to this Standard.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel
Products
GB/T 223.4 Iron, steel and alloy - Determination of manganese content - Potentiometric or visual titration method
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
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 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper 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 223.59 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 contents - Gas- volumetric method after combustion in the pipe furnace
GB/T 223.72 Iron, Steel and Alloy - Determination of Sulfur Content -
Gravimetric Method
GB/T 228 Metallic materials - Tensile testing at ambient 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 method (routine method)
GB/T 5613 Designation for cast steels
GB/T 5677 Castings - Radiographic testing
GB/T 6060.1 Surface roughness comparison specimen - Part 1: Casting
surface
GB/T 6414 Castings - Dimensional tolerances and geometrical tolerances
and machining allowances
GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes
GB/T 9443 Penetrant testing for steel castings
GB/T 9444 Magnetic particle testing for steel castings
GB/T 11351 Mass tolerances of casting
GB/T 11352 Carbon steel castings for general engineering purpose
GB/T 15056 Casting surface roughness - Appraising method
GB/T 16923 Normalizing and annealing of steel parts
5.2.1.2 Unless otherwise specified, the test bar is heat treated in the same furnace as the casting it represents.
5.2.2 When it is necessary to sample from the casting body, the sampling position and performance index are agreed upon by the supplier and the
purchaser.
5.2.3 The tensile test shall be carried out in accordance with the provisions of GB/T 228.
5.2.4 The impact test shall be carried out in accordance with the provisions of GB/T 229.
5.3 Surface inspection
5.3.1 The method for inspecting the surface roughness of castings shall be carried out in accordance with the provisions of GB/T 15056.
5.3.2 For the dimensional inspection of castings, the measuring tools, samples, etc. of the corresponding precision shall be selected.
5.4 Non-destructive testing
When the purchaser requests non-destructive testing of castings, the positions, methods, and standards for testing shall be agreed upon by the supplier and the purchaser; and shall be indicated on the drawings or the contract.
5.4.1 Ultrasonic examination shall be carried out in accordance with the provisions of GB/T 7233.1.
5.4.2 Radiographic testing shall be carried out in accordance with the provisions of GB/T 5677.
5.4.3 Penetrant testing shall be carried out in accordance with the provisions of GB/T 9443.
5.4.4 Magnetic particle testing shall be carried out in accordance with the provisions of GB/T 9444.
6 Inspection rules
6.1 Inspection and acceptance
The inspection and acceptance of castings shall be carried out by the supplier. The purchaser has the right to, in accordance with the provisions of this Standard or the contract, conduct a re-inspection.
d) There are casting defects in the sample.
6.5 Re-inspection
When the test results of mechanical properties do not meet the requirements, and not due to the reasons of 6.4.3, the inspection may be repeated according to 5.2.
6.5.1 For the tensile property re-inspection, from the same batch of test bars, two other samples shall be taken. The test results of each sample shall conform to the provisions of 4.3; then the tensile properties of the batch of castings are qualified. If the test result of one of the samples in the re-inspection is still unqualified, the supplier may process according to 6.6.
6.5.2 For the retest of the impact test, from the same batch of test bars, three other samples shall be taken. The test results shall comply with the provisions of 4.3; and the average of the test results of the six samples including the initial inspection shall comply with the requirements of Table 2. Then the impact absorbing energy of the batch of castings is qualified. If the re-inspection result is still unqualified, the supplier may process according to 6.6.
6.6 Re-heat treatment
When the re-inspection of mechanical properties is unqualified, the batch of castings and test bars is allowed to be re-heat treated; and then inspected according to 6.3.2 and 6.4.2. Without the consent of the purchaser, re-heat treatment shall not exceed two times (no limit on the number of tempers). 6.7 Surface quality
The surface quality of the casting shall be inspected according to 4.4.1. 6.8 Casting?€?s geometry, dimensions, dimensional tolerances, and
machining allowances
Casting?€?s geometry, dimensions, dimensional tolerances, and machining
allowances shall be inspected in accordance with 4.4.2.
7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 The casting shall be cast or marked with a mark. The mark may be the following or part of it:
a) Casting number;

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