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GB/T 42602-2023: Specification of forging of heavy steel forgings
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GB/T 42602-2023: Specification of forging of heavy steel forgings

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ICS 77:140:85 CCSJ32 National Standards of People's Republic of China Forging specification for large steel forgings Released on 2023-05-23 2023-05-23 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Requirements for forging equipment and accessories 2 5 Steel Ingot Requirements 2 6 Forging process 2 6:1 Formulation of forging process 2 6:2 Process flow 2 6:3 Utilization rate of steel ingot 4 6:4 Removal of upper and lower ends of steel ingot 4 6:5 Total forging ratio requirements 4 6:6 Forging temperature range and heating 4 7 Operational Requirements 5 7:1 Operation of forging equipment and accessories 5 7:2 Forging operation 6 8 Forging process risk control 7 9 records 7 10 Check 7 10:1 Forging process inspection 7 10:2 Inspection of forged products 7 Appendix A (Informative) Chemical Composition of Typical Large Steel Forgings 8 Appendix B (Informative) Forging Temperature Range 9 Appendix C (informative) Heating time of large forged steel ingots and hot billets returned to the furnace after forging 10 Reference 12 Table 1 Steel Ingot Utilization Rate 4 Table 2 Total forging ratio requirements 4 Table A:1 Chemical composition of typical large steel forgings 8 Table B:1 Forging temperature range of large steel forgings of different material grades9 Table C:1 Heating time of steel ingots with different cross-sections10 Table C:2 Heating time of hot blanks returned to the furnace after forging with different cross-sections 11

foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting: Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by China Machinery Industry Federation: This document is under the jurisdiction of the National Standardization Technical Committee for Large Castings and Forgings (SAC/TC506): This document was drafted by: Erzhong (Deyang) Heavy Equipment Co:, Ltd:, China First Heavy Machinery Co:, Ltd:, Shanghai Electric Heavy Casting & Forging Co:, Ltd: Co:, Ltd:, CITIC Heavy Industry Machinery Co:, Ltd:, and China Heavy Machinery Research Institute Co:, Ltd: The main drafters of this document: Jiang Xinliang, Sun Lei, Meng Xiangli, Deng Zhenghua, Cai Jing, Liu Kaiquan, Tao Zhiyong, Wang Xinchang, Chen Xinzhuo, Wu Liang, Cao Zhiyuan, Dong Kai, Li Changyi: Forging specification for large steel forgings

1 Scope

This document specifies the use of forging equipment and accessories for forging large steel forgings, ingot manufacturing, forging process, forging operation, forging process Risk control, record and inspection requirements: This document is applicable to steel ingots with a weight greater than or equal to 150t, and a single forging with a weight greater than or equal to 90t, in Ni2, Ni3, Ni4 series Rotor materials, Cr2, Cr3, Cr4 series support roller materials, 12Cr2Mo1, 12Cr2Mo1V container materials, 20MnNiMo nuclear power materials, etc: The forging of the representative large steel forgings (see Appendix A for the relevant chemical composition of material grades), other material grades of large forgings can refer to this document Implement forging:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document: GB/T 8541 Forging Terminology GB/T 9452 Determination method of effective heating zone of heat treatment furnace GB 13318 Forging Production Safety and Environmental Protection General Rules GB/T 36484 Forging Machinery Terminology GB/T 37775 General Technical Specifications for Large Steel Free Forgings

3 Terms and Definitions

GB/T 8541, GB/T 36484, GB/T 37775 and the following terms and definitions apply to this document: 3:1 hydraulic press hydraulic press A general term for presses that use hydraulic transmission to drive slides or working parts: Note: Divided into hydraulic presses and hydraulic presses according to different media: [Source: GB/T 36484-2018, 3:1:3, modified] 3:2 Mechanical equipment used to hold steel ingots or blanks for forging operations and auxiliary operations: Note: This equipment can advance and retreat, rotate, lift and swing the clamped blank: Manipulators are divided into tracked and trackless, with mechanical transmission, hydraulic transmission and hybrid transmission: moveable: [Source: GB/T 8541-2012, 16:7:19, modified] 3:3 forging than forgingratio A method of expressing the degree of deformation during forging: It is usually expressed by the section ratio, length ratio or height ratio (y) before and after deformation: Note: For example, when elongating, y=F0/F=L/L0; when upsetting, y=F/F0=H0/H (where: F0, F---the cross-sectional area of the forging billet before and after deformation; L0, L--- ...