Standard No.:	GB/T 223.71-1997
English Name:	Methods for Chemical Analysis of Iron, Steel and Alloy the Gravimetric Method after Combustion in the Pipe Furnace for the Determination of Carbon Content
Chinese Name:	钢铁及合金化学分析方法管式炉内燃烧后重量法测定碳含量
Chinese Classification:	H11    Steel and iron alloy analysis method
Professional Classification:	GB    National Standard
Issued by:	SBTS
Issued on:	1997-03-17
Implemented on:	1997-9-1
Status:	valid
Superseding:	GB 223.71-1991
Language:	English
File Format:	PDF
Word Count:	3500 words
Price(USD):	70.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the gravimetric method after combustion in the pipe furnace for the determination of carbon content. This standard is applicable to determination of 0.10% (m/m) ~5.00 % (m/m) carbon content in iron, steel, high temperature alloy and precious alloy. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. When this standard is published, the editions indicated are valid. All standards are subject to revision, and Parties concerned are encouraged to discuss the possibility of applying the latest edition of the following standards.

Contents Foreword I 1 Scope 2 Normative References 3 Method Summary 4 Reagents and Materials 5 Instruments and Equipments 6 Sampling and Sample Preparation 7 Analysis Procedures 8 Analysis Results and Expression 9 Precision 10 Test Report Appendix A (Informative) Samples for the Gravimetric Method Precision Test after Combustion in the Pipe Furnace Appendix B (Informative) Source Data of Gravimetric Method Precision Test after Combustion in the Pipe Furnace

*GB 222-1984 Method of sampling steel for determination of chemical composition and permissible variations for product analysis
*GB 6379-1986 Precision of test methods; Determination of repeatability and reproducibility for a standard test method by interlaboratory tests