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GB/T 42602-2023Specification of forging of heavy steel forgings (English PDF)

大型锻钢件的锻造规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 23, 2023

Implementation date

May 23, 2023

Scope

GB/T 42602-2023 is the English-translated version of 大型锻钢件的锻造规范.

This document specifies the forging of heavy steel forgings: the use of the forging equipment and its accessories, the making of the ingot, the forging process and the forging operation, the control of the risks that arise during it, and the records and inspection required.

The document applies to the forging of heavy steel forgings made from ingots of 150 tonnes and above where a single forging weighs 90 tonnes or more, typically rotor steels of the Ni2, Ni3 and Ni4 series, back-up roll steels of the Cr2, Cr3 and Cr4 series, 12Cr2Mo1 and 12Cr2Mo1V vessel steels and 20MnNiMo nuclear power steel, whose chemical compositions are given in Annex A. Heavy forgings in other grades may be forged following this document as a reference.

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Document preview — GB/T 42602-2023

National Standard of the People's Republic of China

ICS: 77.140.85
Classification: J 32

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Requirements for forging equipment and accessories
5 Steel Ingot Requirements
6 Forging process
6.1 Formulation of forging process
6.2 Process flow
6.3 Utilization rate of steel ingot
6.4 Removal of upper and lower ends of steel ingot
6.5 Total forging ratio requirements
6.6 Forging temperature range and heating
7 Operational Requirements
7.1 Operation of forging equipment and accessories
7.2 Forging operation
8 Forging process risk control
9 records
10 Check
10.1 Forging process inspection
10.2 Inspection of forged products
Appendix A (Informative) Chemical Composition of Typical Large Steel Forgings
Appendix B (Informative) Forging Temperature Range
Appendix C (informative) Heating time of large forged steel ingots and hot billets returned to the furnace after forging
Reference

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.

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

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 Manipulator

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 ratio

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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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

Referenced standards

Normative references

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