GB/T 37786-2019Gear steel for numerical control machine tool (English PDF)

1 Scope

This standard specifies the ordering content, classification and code, size, shape, weight, technical requirements and test methods of the steel bars for CNC machine tools.

Law, inspection rules, packaging, signs and quality certificates.

This standard is applicable to the manufacture of hot-rolled or hot-forged alloy structural steel round steel and square steel (hereinafter referred to as "steel") for CNC machine tools.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

Permissible deviation of chemical composition of finished products of GB/T 222 steel

GB/T 223.3 Methods for chemical analysis of steels and alloys - Determination of phosphorus content by diantipyrine methane phosphomolybdate gravimetric method

GB/T 223.11 Determination of chromium content in steels and alloys - either titration or potentiometric titration

GB/T 223.19 Methods for chemical analysis of steels and alloys - s.

GB/T 223.23 Determination of nickel content in steels and alloys - succinimide spectrophotometric method

GB/T 223.26 Determination of molybdenum content of steels and alloys - thiocyanate spectrophotometric method

GB/T 223.60 Steel and alloys - Determination of silicon content by perchloric acid dehydration gravimetric method

GB/T 223.64 Determination of manganese content in steels and alloys - Flame atomic absorption spectrometry

GB/T 223.68 Steel and alloy chemical analysis method - Determination of sulfur content by potassium iodate titration after combustion in tubular furnace

GB/T 223.69 Determination of carbon content of steel and alloys

GB/T 223.79 Determination of multi-element content of iron and steel by X-ray fluorescence spectrometry (conventional method)

End quenching test method for hardenability of GB/T 225 steel (Jominy test)

Low-magnification structure and defect acid etching test method for GB/T 226 steel

GB/T 228.1 tensile testing of metallic materials - Part 1

GB/T 229 metal material Charpy pendulum impact test method

GB/T 231.1 Brinell hardness test for metallic materials - Part 1. Test methods

GB/T 702 hot rolled steel bar size, shape, weight and tolerance

GB/T 908 forged steel bar size, shape, weight and tolerance

GB/T 1979 structural steel low-fold tissue defect rating map

General provisions for GB/T 2101 steel acceptance, packaging, marking and quality certificates

GB/T 2975-2018 Steel and steel products, mechanical properties test sampling position and sample preparation

GB/T 4162 forging steel bar ultrasonic testing method

GB/T 4336 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method)

GB/T 5216 guarantees hardenable structural steel

GB/T 6394 method for determination of average grain size of metals

Low-defect ultrasonic inspection method for GB/T 7736 steel […]