After heat treatment and cold drawing hardening, the strength of 65Mn steel is relatively high, and it has certain flexibility and plasticity; Under the same surface state and complete quenching, the fatigue limit of 65Mn spring steel is equivalent to that of multicolor alloy spring. But the hardenability is poor. Manganese (Mn) improves the hardenability, so the strength, hardness, elasticity and hardenability are higher than that of 65# steel.
65Mn steel properties:
Tensile strength Rb (MPA): 735
Yield strength RS (MPA): 430
Elongation δ 10 (%): 14 ~ 21.5
Reduction of area ψ (%): ≥10
Hot rolling hardness: 240 ~ 270HB
Cold rolling soft hardness: 190 ~ 220HB
Cold rolled hard hardness: 300 ~ 340HB
Heat treatment hardness: 38 ~ 60HRC
Equivalent Of 65Mn alloy Spring Steel:
| GB | AISI/SAE/ASTM/UNS | BS | DIN,WNr |
| 65Mn | 1066 | 080A67 | – |
