6W6Mo5Cr4V

Other

6W6Mo5Cr4V

High-C high-Cr cold-work tool steel. (GB/T 1299; equiv GB Cr12 / DIN 1.2080 / JIS SKD1). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.55
W6
MO4.5
CR3.7
V0.7
P0.03
S0.03

Mechanical Properties

Hardness(annealed):≤269 HB;Hardness(hardened):59-63 HRC

Chinese Standard

T 1299 6W6Mo5Cr4V

Equivalent Grades

GB Cr12 / DIN 1.2080 / JIS SKD1

Applications

高碳高铬冷作模具钢。,"Bar

Available Forms

Block"

Uses

Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈6.5%/5%) 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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