Standard No.:	GB/T 223.6-1994
Chinese Name:	钢铁及合金化学分析方法 中和滴定法测定硼量
English Name:	Methods for chemical analysis of iron,steel and alloy The neutralization titrimetric method for the determination of boron content
Professional Classification:	H11 Steel and iron alloy analysis method
Professional Classification:	GB National Standard
ICS Classification:	77.080
Issued by:
Issued on:	1994-09-26
Implemented on:	1995-06-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:
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1 Subject and Applicability
This standard specifies a neutralization titrimetric method for the determination of boron content.
This standard is applicable to the determination of the boron content in high-boron stainless steels. Boron determination range: 0.50%~2.00%.
2 Principle
Dissolution of the sample with hydrochloric acid. Separation of elements such as ferrum, chromium and nickel. Using mononitrophenol as an indicator, regulation of the solution to acidic. Decarbonation by boiling. Re-regulation of the solution to pH 7. With the presence of mannite, using phenolphthalein as an indicator, titration with sodium hydroxide standard solution.
A tungsten content larger than 15 mg and a molybdenum content larger than 15 mg both interfere the determination.