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GB/T 38749-2020Technical requirements of controlled atmosphere heat treatment (English PDF)

可控气氛热处理技术要求

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

April 28, 2020

Implementation date

November 1, 2020

Scope

GB/T 38749-2020 is the English-translated version of 可控气氛热处理技术要求.

GB/T 38749-2020 is the Chinese standard "Technical requirements of controlled atmosphere heat treatment".

Its scope clause reads: This standard specifies the controllable atmosphere category and application, equipment requirements, process material requirements, heat treatment process, quality inspection, and safety and health Technical requirements such as hygiene, environmental protection and energy saving.

This standard applies to protective heat treatment, carburization, carbonitriding, nitriding and nitrocarburizing of controlled atmospheres.

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Document preview — GB/T 38749-2020

National Standard of the People's Republic of China

ICS: 25.200
Classification: J 36

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

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Controllable atmosphere categories and applications
5 Equipment requirements
6 Process material requirements
7 Heat treatment process
8 Quality Inspection
9 Safety and health requirements
10 Environmental protection and energy saving requirements
Appendix A (Normative Appendix) Carburizing atmosphere uniformity test method
Appendix B (Normative Appendix) Effective Hardness Depth Uniformity Test Method
Appendix C (Normative Appendix) Test Method for Surface Carbon Content Stripping
Appendix D (Normative Appendix) Thin decarburization layer, carbon increase layer measurement method

1 Scope

This standard specifies the controllable atmosphere category and application, equipment requirements, process material requirements, heat treatment process, quality inspection, and safety and health

Technical requirements such as hygiene, environmental protection and energy saving.

This standard applies to protective heat treatment, carburization, carbonitriding, nitriding and nitrocarburizing of controlled atmospheres.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article

Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.

GB/T 224 Decarburization Depth Determination of Steel

GB/T 230.1 Rockwell hardness test of metallic materials Part 1.Test method

GB/T 338 Industrial methanol

GB/T 536 Liquid anhydrous ammonia

GB/T 3634.2 Hydrogen Part 2.Pure hydrogen, high purity hydrogen and ultra pure hydrogen

GB/T 4340.1 Metallic materials Vickers hardness test Part 1.Test method

GB/T 4341.1 Shore hardness test of metallic materials Part 1.Test method

GB/T 4842 Argon

GB/T 5959.1 Safety of electrothermal and electromagnetic treatment devices Part 1.General requirements

GB 5959.4 Safety of electric heating devices Part 4.Special requirements for resistance heating devices

GB/T 6026 Industrial acetone

GB/T 6052 Industrial liquid carbon dioxide

GB/T 6820 Industrial ethanol

GB/T 7232 Terminology of metal heat treatment process

GB/T 8121 Terminology of heat treatment process materials

GB/T 8979 Pure nitrogen, high purity nitrogen and ultra pure nitrogen

GB/T 9450 Determination and verification of the depth of carburizing and hardening layer of steel

GB/T 9451 Determination of total hardened layer depth or effective hardened layer depth on thin surface of steel parts

GB/T 9452 Determination method of effective heating zone of heat treatment furnace

GB/T 10067.1 Basic technical requirements for electrothermal and electromagnetic treatment devices Part 1.General part

GB/T 10067.4 Basic technical conditions of electric heating devices Part 4.Indirect resistance furnace

GB/T 10201 Guidelines for reasonable use of heat treatment

GB/T 11354 Depth determination and metallographic examination of steel parts

GB/T 13324 Terminology of heat treatment equipment

GB/T 15318 Energy-saving monitoring of heat treatment electric furnace

GB 15735 Safety and health requirements for metal heat treatment production process

GB 16297 Comprehensive emission standard of atmospheric pollutants

GB/T 17394.1 Metallic materials Leeb hardness test Part 1.Test method […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 22 pages — is available in the English PDF.

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