W6Mo5Cr4V2Al
OtherW6Mo5Cr4V2Al
Specialty steel grade. (M2 class). (GB/T 1299; equiv GB W6Mo5Cr4V2 / ASTM M2 / JIS SKH51). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 1.05 |
|---|---|
| W | 5.5 |
| MO | 4.5 |
| CR | 3.8 |
| V | 1.75 |
| AL | 0.8 |
| P | 0.03 |
| S | 0.03 |
Mechanical Properties
Hardness(annealed):≤269 HB;Hardness(hardened):65-67 HRC
Chinese Standard
T 1299 W6Mo5Cr4V2Al
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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