20X3MWFA

Alloy Steel

20X3MWFA

Specialty steel grade. eat-resistant steel. (GOST 4543; equiv GB 12Cr1MoV / DIN 13CrMoV4.2). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.08
CR0.9
MO0.25
V0.15

Mechanical Properties

Tensile:≥470 MPa;Yield:≥255 MPa

Chinese Standard

GOST 4543 20X3MWFA

Equivalent Grades

GB 12Cr1MoV / DIN 13CrMoV4.2

Applications

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Available Forms

Bar"

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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