W7Mo4Cr4V2Co5

Other

W7Mo4Cr4V2Co5

Specialty steel grade. (M2 class). (GB/T 1299; equiv GB W6Mo5Cr4V2 / ASTM M2 / JIS SKH51). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.8
W5.5
MO4.5
CR3.8
V1.75

Mechanical Properties

Hardness:≥64 HRC

Chinese Standard

T 1299 W7Mo4Cr4V2Co5

Equivalent Standards

ASTM M2

Applications

钼系高速钢（同M2）。,Bar

Available Forms

Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈6.125%/5%) give hot hardness and red-hardness for high-speed and hot-work tools. High chromium (≈4.1%) provides wear resistance and secondary hardening. Applied to blanks, punches, extrusion dies, shear blades, plastic-mold and cold-work tooling.

Uses

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

Heat Treatment

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.

Precautions

GB W6Mo5Cr4V2 / JIS SKH51

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