O6

Other

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

Chemical Composition (%)

C	1.3
SI	0.9
MN	0.55
MO	0.25
P	0.03
S	0.06

Mechanical Properties

Hardness(annealed):≤212 HB;Hardness(hardened):58-63 HRC

Chinese Standard

ASTM A681 O6

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. Molybdenum (≈0.35%) raises high-temperature strength and prevents temper embrittlement. 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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O6