GB/T 20123-2006 in English

《GB/T 20123-2006钢铁 总碳硫含量的测定 高频感应炉燃烧后红外吸收法（常规方法）》由TC183（全国钢标准化技术委员会）归口，TC183SC5（全国钢标准化技术委员会钢铁及合金化学成份测定分会）执行，主管部门为中国钢铁工业协会。
本标准规定了高频感应炉燃烧后红外吸收法测定钢铁中产叫碳硫含量的方法。本方法适用于质量分数为0.005%～4.3%的碳含量及0.000 5%～0.33%的硫含量的测定。本方法能适用于常规的生产控制分析工作，并符合公认的实验室认可机构对分析方法的要求，这种方法是被广泛接受的、好的实验室分析方法。本标准采用校准过的商业仪器，并以钢铁有证参考物质验证校准，同时其仪器性能由常规统计过程控制方法(SPC)进行控制。本方法采用单素测定方式，即单独测定碳或硫；或者采用同时测定方式，即同时测定碳和硫。

1 Scope

This Standard specifies an infrared absorption method after combustion in an induction furnace for the determination of the total carbon and sulfur content in steel and iron.
The method is applicable to carbon contents of mass fraction between 0.005 % and 4.3 % and to sulfur contents of mass fraction between 0.000 5 % and 0.33 %.
This method is intended to be used in normal production operations and is intended to meet all generally accepted good laboratory practices of the type expected by recognized laboratory accreditation agencies. It uses commercially available equipment which is calibrated and calibration verified using steel and iron certified reference materials and its performance is controlled using normal statistical process control (SPC) practices.
This method can be used in the single element mode i.e determination of carbon and sulfur independently or in the simultaneous mode i.e determination of carbon and sulfur concurrently.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments or revisions of any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

1 Scope 1
2 Normative References 1
3 Principle 2
4 Reagents 2
5 Apparatus 3
6 Test Method 3
7 Sampling 5
8 Procedure 5
9 Expression of Results 10
10 Test Report 12
Appendix A (Informative) Examples of Diagram for Analytical Principles 13
Appendix B (Informative) Example for Calculation of a Linearity Check 17
Appendix C (Informative) Additional Information on International Cooperative Tests 18
Appendix D (Informative) Graphical Representation of Precision Data 23