GB/T 222-1984 specifies the sampling method for the chemical analysis of steel and the permissible deviations for chemical composition of finished products.
The purpose of this standard is to provide technical requirements for the sample method of chemical analysis of steel, and the permissible deviations of finished products chemical composition in accordance with the characteristics of the material.
The scope of this standard applies to the sample taking and chemical analysis of the following steels:
(1) Carbon structural steels and low alloy structural steels;
(2) Special purpose alloy structural steels;
(3) Carbon tool steels;
(4) Special purpose alloy tool steels;
(5) High-speed tool steels;
(6) Alloy die-casting steels;
(7) Non-aging stainless steels;
(8) Age-hardening stainless steels;
(9) Plastic mold steels;
(10) Heat-resistant steels;
(11) Wear-resistant steels;
(12) Bearing steels;
(13) High-temperature alloys;
(14) Nickel-based alloys;
(15) Cobalt-based alloys.
This standard is divided into six chapters, including the General Principles, Sampling Procedure, Sample Size, Chemical Composition Allowable Deviations, Quality Evaluation and Quality Review.
General Principles: This chapter contains basic definitions, scope, general requirements and other relevant provisions.
Sampling Procedure: This chapter provides a detailed explanation of the sampling steps, including the correct sample taking, division and packaging.
Sample Size: This chapter provides instructions on the type and size of the required sample.
Chemical Composition Allowable Deviations: This chapter provides an explanation of the allowable deviations for steel chemical composition.
Quality Evaluation: This chapter covers the principles of evaluating the quality of steel samples.
Quality Review: This chapter provides quality control requirements that must be met in the production and supply of steel products.
This standard is applicable to the manufacturers and suppliers of steel materials, as well as to the manufacturers and suppliers of related products. Therefore, its implementation is of great importance to the quality of steel products.
