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GB/T 42602-2023: Specification of forging of heavy steel forgings
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| GB/T 42602-2023 | English | 339 |
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Specification of forging of heavy steel forgings
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GB/T 42602-2023
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Basic data | Standard ID | GB/T 42602-2023 (GB/T42602-2023) | | Description (Translated English) | Specification of forging of heavy steel forgings | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J32 | | Classification of International Standard | 77.140.85 | | Word Count Estimation | 16,168 | | Date of Issue | 2023-05-23 | | Date of Implementation | 2023-05-23 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 42602-2023: Specification of forging of heavy steel forgings---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
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---
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