R6M5

Other

R6M5

Tungsten-type high-speed steel (T1 class). (GOST 1435; equiv GB W18Cr4V / ASTM T1 / JIS SKH2). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.7
W17.5
CR3.8
V1

Mechanical Properties

Hardness:≥63 HRC

Chinese Standard

GOST 1435 R6M5

Equivalent Standards

ASTM T1

Applications

钨系高速钢（同T1）。,Bar

Available Forms

Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈18.25%/0%) 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 W18Cr4V / JIS SKH2

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