20CrMnTi

Alloy Steel

20CrMnTi

Carburizing gear steel. (GB/T 3077; equiv GB 20CrMnTi). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.17
SI0.17
MN0.8
CR1
TI0.04
P0.035
S0.035

Mechanical Properties

Tensile:≥1080 MPa;Yield:≥835 MPa;Elong:≥10%;RA:≥45%;Akv:≥55 J

Chinese Standard

T 3077 20CrMnTi

Applications

渗碳齿轮钢。,Bar

Available Forms

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.

Uses

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.

Heat Treatment

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.

Precautions

GB 20CrMnTi

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