GB/T 42537-2023Specification of heat treatment for super-scale steel forgings (English PDF)

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 technical requirements and process methods for the heat treatment of extra-large steel forgings forged from steel ingots of more than 250 tons.

This document is applicable to steel ingots with a weight greater than or equal to 250t, forgings made of Ni2, Ni3, Ni4 series rotor materials, Cr2, Cr3, Cr4 A series of backup roller materials, 12Cr2Mo1, 12Cr2Mo1V container materials, 20MnNiMo nuclear power materials, etc. are typical representatives of energy, metallurgy, Heat treatment of extra-large steel forgings for heavy equipment in petrochemical and other industries, see Appendix A for the chemical composition of commonly used materials for extra-large steel forgings, and other Refer to this document for heat treatment of oversized forgings.

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 7232 Metal Heat Treatment Process Terminology

GB/T 13324 Terminology of heat treatment equipment

GB 15735 Metal Heat Treatment Production Process Safety and Sanitation Requirements

GB/T 16924 Quenching and Tempering of Steel Parts

GB/T 27946 Limits of Hazardous Substances in the Air of Heat Treatment Workplaces

GB/T 30822 Environmental Protection Technical Requirements for Heat Treatment

GB/T 32541 Heat Treatment Quality Control System

GB/T 37559-2019 Normalizing and annealing of large steel forgings

3 Terms and Definitions

The following terms and definitions defined in GB/T 7232, GB/T 13324 and GB/T 37559-2019 apply to this document.

4 Basic requirements

4.1 The manufacturer should have a complete quality assurance system, and should have the performance of producing forgings of similar materials and sizes or have passed the review. Experience like forging.

4.2 Process plan should be evaluated before heat treatment. The process plan includes the process method, hoisting method, process equipment used and necessary Assistive devices, necessary technical measures, safety measures and process parameters, etc. The process plan should generally adopt mature process parameters, allowing The actual situation is slightly adjusted.

4.3 In order to ensure the controllability of the quality of forgings, the manufacturer should have the ability to smelt, forge and heat treat extra-large steel forgings.