SKD61

Other

SKD61

Hot-work tool steel. (JIS G4902; equiv ASTM A681 / DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.32
CR4.5
MO1
V0.8
SI0.8
MN0.25
P0.03
S0.03

Mechanical Properties

Hardness(annealed):≤229 HB;Hardness(hardened):48-55 HRC

Chinese Standard

JIS G4902 SKD61

Equivalent Standards

ASTM A681

Equivalent Grades

DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1

Applications

热作模具钢。,"Bar

Available Forms

Block"

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈5%) improves hardenability, wear and corrosion resistance. Molybdenum (≈1.25%) raises high-temperature strength and prevents temper embrittlement. Vanadium (≈0.975%) refines grain and strengthens the tempered structure. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Heat Treatment

Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.

Precautions

Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating).

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