G20Cr2Ni4A

Other

G20Cr2Ni4A

Carburizing bearing steel, high core toughness for heavy impact loads.

Chemical Composition (%)

C0.17
SI0.17
MN0.4
CR1.25
NI3.25
P0.025
S0.025

Mechanical Properties

Tensile(case):≥1180 MPa;Core Hardness:25-45 HRC;Akv:≥78 J

Chinese Standard

T 3203 G20Cr2Ni4A

Equivalent Standards

G20CrNi2MoA

Equivalent Grades

SAE 4320 / 8620

Applications

Heavy-duty bearings, auto gears, pinions

Available Forms

Bar,Forging

Uses

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.

Heat Treatment

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.

Precautions

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.

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