SKH40

Other

SKH40

General-purpose high-speed steel. (JIS G4404; equiv ASTM A600 / DIN 1.3343 / JIS SKH51 / GB W6Mo5Cr4V2). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.78
W5.5
MO4.5
CR3.75
V1.75

Mechanical Properties

Hardness:≥63 HRC

Chinese Standard

JIS G4404 SKH40

Equivalent Standards

ASTM A600

Applications

通用高速钢。,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 (≈4.125%) 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

DIN 1.3343 / JIS SKH51 / GB W6Mo5Cr4V2

Request a Quote Back to category

Comments 0