Cr4Mo4V

Other

Cr4Mo4V

High-temperature bearing steel, AISI M50 equivalent. Good hot hardness to 320°C.

Chemical Composition (%)

C0.77
SI0.4
MN0.35
CR3.75
MO4
V0.9
P0.015
S0.01

Mechanical Properties

Hardness(annealed):≤241 HB;Hardness(hardened):60-63 HRC

Chinese Standard

T 30892 Cr4Mo4V / AISI M50

Equivalent Standards

M50 / AMS 6491

Applications

Aerospace bearings, engine main bearings, high-temp gears

Available Forms

Bar,Forging

Uses

Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈0%/4.25%) give hot hardness and red-hardness for high-speed and hot-work tools. High chromium (≈4%) provides wear resistance and secondary hardening. Applied to blanks, punches, extrusion dies, shear blades, plastic-mold and cold-work tooling.

Heat Treatment

Powder/HSS: preheat 800–850 °C, austenitize 1180–1230 °C (salt or vacuum), quench, triple temper 540–570 °C to ≈64–66 HRC.

Precautions

Risk of quench cracking and distortion — use graded preheating, controlled cooling and multiple tempers. Avoid overheating the austenitizing temperature. Machine in the soft annealed condition; allow for dimensional change after heat treatment. Grind with coolant to prevent rehardening cracks.

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