| Grade | IS 4367:1991 (Reaffirmed 2001) 20C15 / IS 4367 20C15 |
| Standard | IS 4367:1991 (Reaffirmed 2001) |
| Description | Low carbon manganese alloy steel used for case hardening applications. Good toughness and moderate hardenability, suitable for gears, shafts and fasteners. |
| Applications | Low-carbon case-hardening (carburizing) steel; used for lightly stressed components such as pins, bushes, and small shafts requiring a hard wear-resistant surface with a tough core |