SKS42

Other

SKS42

Oil-hardening cold-work tool steel. (JIS G4404; equiv ASTM A681 / DIN 1.2510 / JIS SKS3). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.85
MN1
CR0.4
W0.4

Mechanical Properties

Hardness (Q&T):58-62 HRC

Chinese Standard

JIS G4404 SKS42

Equivalent Standards

ASTM A681

Equivalent Grades

DIN 1.2510 / JIS SKS3

Applications

油淬冷作模具钢。,"Bar

Available Forms

Block"

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.5%) improves hardenability, wear and corrosion resistance. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Heat Treatment

Austenitize at 760–820 °C and quench (oil/water) then temper at 150–400 °C for high hardness; spheroidize anneal (680–720 °C) improves machinability of the as-rolled bar.

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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