20Cr4

Alloy Steel

20Cr4

Carburizing gear steel. (DIN 17200; equiv EN 10084 / DIN 16MnCr5 / 1.7131). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.14
MN1
CR0.8

Mechanical Properties

Tensile:780-1080 MPa;Yield:≥590 MPa

Chinese Standard

DIN 17200 20Cr4

Equivalent Standards

EN 10084

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

DIN 16MnCr5 / 1.7131

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