Ph: 810 - 227 - 3251 Fax: 810 - 227 - 9266 sales@cor-met.com AISI LOW ALLOY ALLOY DESCRIPTION CLASSIFICATION PHYSICALS DATA SHEETS 4130 FC Responds to 4130 quench and temper. Also used as a flame-hardening alloy. AISI 4130 type Dependent on heat treatment, flame hardens to 52 Rc 4140 FC Responds to ...