SUH11A

Other

SUH11A

Hot-work tool steel. (JIS G4901; equiv ASTM A681 / DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.32
SI0.8
MN0.2
CR4.75
MO1.1
V0.8

Mechanical Properties

Hardness (Q&T):44-52 HRC

Chinese Standard

JIS G4901 SUH11A

Equivalent Standards

ASTM A681

Equivalent Grades

DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1

Applications

热作模具钢。,"Bar

Available Forms

Block"

Uses

Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈0%/1.425%) give hot hardness and red-hardness for high-speed and hot-work tools. High chromium (≈5.125%) provides wear resistance and secondary hardening. Applied to blanks, punches, extrusion dies, shear blades, plastic-mold and cold-work tooling.

Heat Treatment

Hot-work: preheat 800 °C, austenitize 1020–1080 °C, quench, temper 540–620 °C (multiple) for hot hardness and thermal fatigue resistance.

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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