21MnNiMo

Alloy Steel

21MnNiMo — alloy steel (GB/T 3077). Shafts, gears, axles, connecting rods, bolts, machinery structural parts, automotive and engineering components.

Mechanical Properties

QT: Rm ≥900 MPa, Rp0.2 ≥750 MPa, A ≥14%

Chinese Standard

GB/T 3077

Equivalent Standards

21MnNiMo

Applications

Missiles, rocket

Available Forms

Bar

Uses

Shafts, gears, axles, connecting rods, bolts, machinery structural parts, automotive and engineering components.

Heat Treatment

Normalized at 850-900°C, air cooled. Quenched + tempered at 550-650°C for improved strength. Specific treatment per grade standard (GB/T 3077, ASTM A29).

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