... strength strip 1:hardness :43-48 stainless steel ,carbon steel ,50#65 Mn hardened steel belt2: widely applied in auto clutch ... ,hardware ,electrical appliances3: bright blade ,hardened steel belt 4:grade:50#,65Mn,T8,T9,T10,Sk5,sk95:used for making parts ... your attentions. hot rolled stainless ,bright,mild,hardened steel belt 50#65Mn