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GB/T 7659-2025 PDF English

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GB/T 7659-2025: Steel castings for welding structures
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Status: Valid

GB/T 7659: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 7659-2025275 Add to Cart Auto, 9 seconds. Steel castings for welding structures Valid
GB/T 7659-2010135 Add to Cart Auto, 9 seconds. Steel casting suitable for welded structure Valid
GB/T 7659-1987279 Add to Cart 3 days Carbon steel castings suitable for welded structure Obsolete

Similar standards

GB/T 7233.1   GB/T 7216   GB/T 7143   GB/T 5612   

GB/T 7659-2025: Steel castings for welding structures

---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/GBT7659-2025
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.80 CCS J 31 Replacing GB/T 7659-2010 Steel Castings for Welding Structures Issued on: JUNE 30, 2025 Implemented on: JANUARY 1, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 7 4 Designation... 7 5 Manufacturing... 7 6 Technical Requirements... 8 7 Test Methods... 10 8 Inspection Rules... 11 9 Marking, Certificate of Quality, Packaging, Transportation and Storage... 14 Appendix A (Normative) Carbon Equivalent Provisions... 16 Steel Castings for Welding Structures

1 Scope

This Document specifies the designation, manufacturing, technical requirements, test methods, inspection rules, marking, packaging, storage, and transportation requirements for steel castings for welding structures. This Document applies to the manufacture of steel castings for welding structures (hereinafter referred to as "castings").

2 Normative References

The provisions in following documents become the essential provisions of this Document through reference in 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) is 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 223.11 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 determining vanadium content GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodometric method for the determination of copper 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 40800 Specification and qualification of welding procedures for production welding of steel castings GB/T 40805 Steel castings - General technical delivery requirements

3 Terms and Definitions

For the purposes of this Document, the terms and definitions given in GB/T 5611 apply.

4 Designation

The designation representation method for casting shall comply with the provisions of GB/T 5613; and based on the performance level of the material, it is divided into five material designations. ZGH200-380, ZGH240-450, ZGH270-480, ZGH300-500, and ZGH340-550.

5 Manufacturing

5.1 Casting and heat treatment 5.1.1 Unless otherwise specified by the purchaser, the smelting method and casting process shall be determined by the supplier. 5.1.2 Core supports and internal chills shall not be used without the written permission of the purchaser. 5.1.3 Unless otherwise specified, castings shall undergo heat treatment; and the heat treatment process shall be determined by the supplier. It shall implement according to the provisions of GB/T 16923 and GB/T 16924. 5.1.4 If castings occur deformation, correction is permissible; after correction, the castings shall undergo stress relief treatment. 5.2 Welding repair 5.2.1 Unless otherwise specified, defects in castings may be repaired by welding. 5.2.2 Welders shall be qualified and certified according to the provisions of GB/T 15169. 5.2.3 The supplier may perform welding repairs on casting defects; the welding repair conditions shall be determined by the supplier. If the purchaser has specific requirements regarding the location, size, and number of welding repairs, a supplementary technical agreement between the supplier and purchaser shall be established. 5.2.4 Prior to welding repair, a welding procedure qualification test shall be performed according to the provisions of GB/T 40800.The supplier shall prepare a welding repair procedure specification to weld based on the welding procedure qualification report. 5.2.5 Before welding repair, the defective area of the casting shall be cleaned and the edges smoothly transitioned. 5.2.6 Welding repairs are considered significant if the depth of the groove (bevel) prepared for welding repair exceeds 20% of the casting wall thickness or 25 mm (whichever is smaller); or if the cross-sectional area of the welding repair cavity is greater than 65 cm²; or if there is leakage during the pressure test of pressure-bearing castings. 5.2.7 The welding repair procedure specification shall be confirmed by the purchaser before implementation. The procedure specification for significant welding repairs must be confirmed by the purchaser before implementation; and a record of the location, extent, and process of the significant welding repair must be kept. 5.2.8 Stress relief heat treatment shall be performed after significant welding repairs. 5.2.9 After welding repairs are completed on the casting, the repaired area must be re-inspected according to the casting inspection requirements.

6 Technical Requirements

6.1 Chemical composition 6.1.1 The designation and chemical composition of the casting shall comply with the provisions of Table 1. 6.1.2 The carbon equivalent values and calculation methods for different designations of castings are specified in Appendix A.

7 Test Methods

7.1 Chemical composition 7.1.1 The sampling and sample preparation methods for chemical composition analysis shall comply with the provisions of GB/T 20066. 7.1.2 The chemical analysis methods shall be implemented according to the provisions of GB/T 223.5, GB/T 223.11, GB/T 223.13, GB/T 223.18, GB/T 223.23, GB/T 223.26, GB/T 223.59, GB/T 223.69, and GB/T 223.72. 7.1.3 The spectroscopic analysis method shall be implemented according to the provisions of GB/T 4336 or GB/T 20125. 7.1.4 In case of dispute over the analysis results, the results of chemical analysis shall prevail. 7.2 Mechanical properties 7.2.1 Tensile test shall be performed according to the provisions of GB/T 228.1. 7.2.2 Impact test shall be performed according to the provisions of GB/T 229. 7.3 Surface quality 7.3.1 The surface quality inspection of the castings shall in accordance with the provisions of GB/T 39428. 7.3.2 Penetrant test of castings shall be performed in accordance with the provisions of GB/T 9443. 7.3.3 Magnetic particle test of castings shall be performed in accordance with the provisions of GB/T 9444. 7.3.4 The surface roughness of castings shall be implemented in accordance with the provisions of GB/T 15056.Alternatively, visual inspection using comparison photographs may be used; the comparison photographs shall comply with the that for surface roughness specified in Appendix C of GB/T 39428-2020. 7.4 Internal quality 7.4.1 Ultrasonic test of castings shall be performed in accordance with the provisions of GB/T 7233.1. 7.4.2 Radiographic test of castings shall be performed in accordance with the provisions of GB/T 5677.Alternatively, X-ray digital imaging test method of castings may be used, which shall be performed in accordance with the provisions of GB/T 39638. 7.5 Geometric and dimensional tolerances The geometric and dimensional tolerances of castings shall be inspected using appropriate precision measuring tools, gauge blocks, templates, or scribing tools. 7.6 Weight The weight tolerance of castings shall be performed according to the provisions of GB/T 11351.

8 Inspection Rules

8.1 Inspection and acceptance Unless otherwise specified, the supplier shall be responsible for the inspection and acceptance of the castings. The purchaser has the right to conduct re-inspection according to the provisions of this Document or the contract. 8.2 Batching The batching of castings for inspection shall be carried out as follows; specific requirements shall be agreed upon by both parties and stipulated in the order contract. If the purchaser does not have specific requirements, the supplier may choose any one of the following methods. a) By furnace. Castings poured from the same melting furnace and subjected to the same heat treatment batch constitute one batch. b) By weight. Under stable melting process conditions, castings of the same material designation, poured from multiple melting furnaces and subjected to multiple heat treatments with the same process in multiple furances, constitute one batch based on a certain weight. c) By quantity. For certain castings with special requirements, one or several pieces may constitute one batch. 8.3 Test blocks 8.3.1 Unless the purchaser has special requirements, the size, shape, position, casting conditions ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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