1994GB/T 223.6-1994 Methods for chemical analysis of iron,steel and alloy. The neutralization titrimetric method for the determination of boron content
1981GB 223.6-1981 Determination of boron content in iron,steel and alloy
GB 223.6-1981 Determination of boron content in iron,steel and alloy was changed to GB/T 223.6-1994 Methods for chemical analysis of iron,steel and alloy. The neutralization titrimetric method for the determination of boron content.