15CrMo

Alloy Steel

15CrMo

Cr-Mo heat-resistant steel. (GB/T 3077; equiv ASTM A387 Gr.12 / DIN 15CrMo5). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.12
SI0.17
MN0.4
CR0.8
MO0.4
P0.035
S0.035

Mechanical Properties

Tensile:≥440 MPa;Yield:≥295 MPa;Elong:≥22%

Chinese Standard

T 3077 15CrMo

Equivalent Standards

ASTM A387 Gr.12

Equivalent Grades

Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating). Machine the core stock before surface hardening; leave grinding allowance for the hardened case.

Applications

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Available Forms

Plate

Uses

Bar"

Heat Treatment

Carburizing (case-hardening) steel with low carbon core for toughness and a hard, wear-resistant surface after carburizing. Used for gears, camshafts, pinions, spline shafts, bushings and transmission parts subjected to fatigue and surface wear.

Precautions

Typically normalized (880–920 °C, air cool) or carburized (900–930 °C) for case-hardening grades, then quenched and tempered at 150–200 °C. Carburize 900–930 °C, direct/intake quench, temper 150–200 °C; useful case depth 0.5–1.5 mm.

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