SKD12

Other

SKD12

Specialty steel grade. ie steel. (JIS G4404; equiv ASTM A681 / DIN 1.2379 / JIS SKD11 / GB Cr12MoV). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.95
CR4.75
MO0.9
V0.15
P0.03
S0.03

Mechanical Properties

Hardness(annealed):≤241 HB;Hardness(hardened):57-62 HRC

Chinese Standard

JIS G4404 SKD12

Equivalent Standards

ASTM A681

Equivalent Grades

DIN 1.2379 / JIS SKD11 / GB Cr12MoV

Applications

高铬冷作模具钢。,"Bar

Available Forms

Block"

Uses

High-carbon chromium bearing steel for rolling-element bearings, races and precision balls/rollers. Combines high hardness, fatigue life and dimensional stability; also used for gauges, needles and wear parts.

Heat Treatment

Spheroidize anneal (760–780 °C), austenitize 830–860 °C oil quench, temper 150–180 °C to 60–66 HRC; stabilising treatments improve dimensional stability.

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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