Standard No.:	GB/T 223.40-2007
English Name:	Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method
Chinese Name:	钢铁及合金 铌含量的测定 氯磺酚S分光光度法
Chinese Classification:	H11    Steel and iron alloy analysis method
Professional Classification:	GB    National Standard
ICS Classification:	77.040.30 77.040.30    Chemical analysis of metals 77.040.30
Issued by:	AQSIQ; SAC
Issued on:	2007-03-09
Implemented on:	2007-10-1
Status:	valid
Superseding:	GB/T 223.40-1985 Methods for chemical analysis of iron,steel and alloy; The anion-exchange separation-sulphochlorophenol S photometric method for the determination of niobium content GB/T 223.39-1994 Methods for chemical analysis iron,steel and alloy The sulphochlorophenol S photometric method for the determination of niobium content
Language:	English
File Format:	PDF
Word Count:	2500 words
Price(USD):	50.0
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This Part of GB/T 223 specifies the determination of niobium content by the sulphochlorophenol S spectrophotometric method. This Part is applicable to determination of niobium content in carbon steel and low alloy steel with a mass fraction of 0.010%~0.50 %.

Foreword I 1 Scope 2 Normative References 3 Principles 4 Reagents 5 Instruments 6 Sampling and Sample Preparation 7 Analytical Procedure 8 Result Calculations 9 Precision 10 Test Report Appendix A (Informative) Additional Information on Common Precision Test