GB/T 222-2006 in English

SUPERSEDED

Permissible Tolerances for Chemical Composition of Steel Products

Issued on:2006-02-05
Implemented on:2006-08-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $40.00
$39.00

Standard No:	GB/T 222-2006
Document status:	SUPERSEDED
Superseded by:	GB/T 222-2025 Steels and alloys—Permissible deviations of product analyzed chemical composition
Superseded on:	2025-12-01
Title in English:	Permissible Tolerances for Chemical Composition of Steel Products
Title in Chinese:	钢的成品化学成分允许偏差
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2006-02-05
Implemented on:	2006-08-01
ICS Classification:	77.080.20-Steels
Chinese Classification:	H40-Steel and iron products in general
Professional Classification:	GB-National Standard
Related Keywords:	steel composition chemical composition melted chemical composition permissible tolerances steel products
Related Topics:	Detection of chemical composition chemical composition δ phase chemical composition detection of chemical components finished product Detection of chemical composition Chemical Composition Testing Basis Chemical Composition of Plastics Composition test Composition test chemical standard deviation The role of chemical composition The chemical composition of hydrazine din chemical composition Calcium ingredients Permissible range of relative deviation GB/t+222 en allows 1/10,000 allowable error Allowable deviation of chemical composition of steel Deviation management Steel chemical composition deviation Analysis of chemical composition of steel plate finished product ingredients chemical composition Allow relative deviation Permissible relative deviation range Allow relative deviation pretty 1/1000 tolerance Chemical Composition of Steel gb/t.222 Chemical composition of caustic soda Chemical composition of caustic soda total allowable error relative tolerance hj/t 222 total tolerance The chemical composition of cadmium deviation standard Composition Standard chemical constituents in food For detection of chemical composition allow chemical composition of plastic Allowable deviation finished steel Allowable Deviation of Chemical Composition of Steel Finished Products Chemical Composition Permissible Deviation GB/T222 GB/T222-2006 GBT222 GBT222-1984 GBT 222-2006 gb/t222-1984 Element gb 222 GB/T222 Laboratory comparison allowable deviation gb222 Chemical composition of Zhaoshan White Ste ms4462 A Chemical composition of materials gbt222 latest HCY’s allowable total error Stone allowable deviation specification gbt18601_2009 Electronic scale allowable error Chemical composition testing Allowable deviation of standard leak holes Antimony assay tolerance Chemical testing methods allow relative deviations Chemical composition of electrical steel Test tolerance Hydrogen chloride allowable concentration Spectral component allowable deviation Deviation relative deviation absolute deviation standard deviation Testing methods for chemical composition of steel plates Allowable error and standard deviation of the balance gbt222-2006 Chemical composition detection deviation Analytical Chemistry Standard Deviation Range of standard deviation in analytical chemistry Relative deviation allowable range gb/t 222-1984 gb/t 222-2016

《GB/T 222-2006钢的成品化学成分允许偏差》由TC183（全国钢标准化技术委员会）归口，TC183SC2（全国钢标准化技术委员会基础分会）执行，主管部门为中国钢铁工业协会。
本标准规定了非合金钢(沸腾钢除外)、低合金钢、合金钢的成品钢材(包括钢坯)的化学成分相对于规定熔炼化学成分界限值的允许偏新式，并给出了相关术语的定义。
本标准适用于钢的产品标准、技术规范对成品化学成分允许偏差的规定。

1 Scope
This standard prescribes permissible tolerances of chemical composition of finished unalloy steel (excluding boiling steel), low alloy steel and alloy steel products versus threshold value of melted chemical composition, as well as relevant terms and definitions.
2 Terms and Definitions
This following terms and definitions are applicable to this standard.

2.1 Heat (or cast/ladle) analysis
It refers to a procedure that taking ingot sample during molten steel casting to make test sample and then carrying out chemical analysis. The analytic result refers to average chemical composition of molten steel of the same batch.
2.2 Product analysis
Product analysis refers to take sample from processed finished steel product (including steel feed) and then to analyze its chemical composition. Product analysis is mainly used to check chemical composition, and it is also called check analysis. Due to the fact that molten steel is distributed unevenly (segregation) during crystallization, composition value of product analysis is different from composition value of heat analysis sometimes.
2.3 Permissible tolerances for product analysis
It refers to that although composition value of heat analysis is within the exceed composition threshold value specified in standards due to segregation of steel composition. A permissible value is specified for the degree exceeding the threshold value, and the permissible value is the permissible tolerance for product analysis.

3 Sampling and Sample-making Methods for Product Analysis
Sampling and sample fabrication used to measure chemical composition of finished steel product shall comply with methods specified in applicable national standards and industry standards, or other methods may be adopted through negotiations between both parties.

Foreword II
1 Scope
2 Terms and Definitions
3 Sampling and Sample-making Methods for Product Analysis
4 Chemical Analysis Method
5 Permissible Tolerance for Product Analysis

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