GB/T 16923-2026Normalizing and annealing of steel parts (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

This document replaces GB/T 16923-2008 "Normalizing and Annealing of Steel Parts". Compared with GB/T 16923-2008, except for structural adjustments and... Aside from editorial changes, the main technical changes are as follows.

a) The term "aberration" has been removed (see 3.1 in the 2008 edition);

b) A "vacuum annealing" process has been added (see Table 1);

c) Requirements for the material grade and chemical composition of steel components have been added (see 5.1);

d) Requirements for measuring the temperature uniformity of gas-fired heating furnaces have been added (see 6.1.1);

e) The requirements for temperature uniformity of the heating furnace have been changed (see Table 4, 2008 edition);

f) The relevant provisions for hot bath heating furnaces and fluidized particle furnaces have been deleted (see 6.1.5 and 6.1.7 of the 2008 edition);

g) The requirements for vacuum furnaces have been changed (see 6.1.5, 6.1.6 in the 2008 edition);

h) The requirements for temperature measurement and temperature control have been changed (see 6.2, 2008 version 6.2);

i) The specifications for hardness tolerance have been changed (see Table 5, Table 5 in the 2008 edition);

j) Increased requirements for process records (see 7.6);

l) Increased energy consumption requirements (see Chapter 10).

1 Scope

This document specifies the materials and processing conditions for normalized and annealed steel parts, as well as the equipment, processes, quality inspection, safety and hygiene, and energy efficiency requirements for normalized and annealed steel parts. Source consumption and product reporting requirements.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 224 Method for Determination of Decarburized Layer Depth in Steel

GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method

GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method

GB/T 699 High-quality carbon structural steel

GB/T 1220 Stainless Steel Bars

GB/T 1221 Heat-resistant steel bars

GB/T 1222 Spring Steel

GB/T 1299 Tool and Die Steel

GB/T 3077 Alloy Structural Steel

GB/T 3086 High-carbon chromium stainless bearing steel

GB/T 3203 Carburized Bearing Steel

GB/T 3279 Hot-rolled spring steel plates and strips

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

GB/T 4341.1 Metallic materials - Shore hardness test - Part 1: Test method

GB/T 6394 Method for Determination of Average Grain Size of Metals

GB/T 9452 Method for determining the effective heating zone of a heat treatment furnace

GB/T 9943 High-speed tool steel

GB/T 12603 Classification and Codes of Metal Heat Treatment Processes

GB/T 13298 Examination Methods for Metallic Microstructure

GB/T 13324 Terminology for Heat Treatment Equipment

GB 15735 Safety and hygiene requirements for metal heat treatment processes

GB/T 17358 Methods for Calculation and Determination of Electricity Consumption in Heat Treatment Production

GB/T 18254 High Carbon Chromium Bearing Steel

GB/T 19944 Methods for Calculation and Determination of Fuel Consumption in Heat Treatment Production

GB/T 22561 Vacuum heat treatment

GB/T 30824 Test method for temperature uniformity of gas-fired heat treatment furnace