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Standard Type : Main
Document No : ISO 5954:2014
Document Year : 2014
Pages : 8
Edition : 4
Section Volume : Continuous mill flat rolled products (ISO/TC 17/SC 12.)
The following are common hardness ranges (see 6.6): CRH-50: Rockwell B 50 to 70; CRH-60: Rockwell B 60 to 80; CRH-70: Rockwell B 70 to 90; CRH-NN: Any Rockwell B range of 20 points up to and including HRB 90 maximum (designated minimum of specified range will be shown).