HSS steel:2.2mm-160mm,HSS steel,cold drawing ,rolled ,black surface & bright finished surface treatment HSS steel:2.2mm-160mm,HSS steel,cold drawing ,rolled ,black surface & bright finished surface treatment .raw material grade:M42,M35,M7,M2AL,M2( 1.3343),9341,4341,4241.Have the advantage of strong intensity and excellent toughness.