A10
OtherA10
Air-hardening cold-work tool steel. (ASTM A681; equiv ASTM A681 / DIN 1.2363 / JIS SKD12). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 1.25 |
|---|---|
| NI | 1.55 |
| MN | 1.6 |
| MO | 1.25 |
| SI | 1 |
| P | 0.03 |
| S | 0.08 |
Mechanical Properties
Hardness(annealed):≤269 HB;Hardness(hardened):58-63 HRC
Chinese Standard
ASTM A681 A10
Equivalent Standards
ASTM A681
Equivalent Grades
DIN 1.2363 / JIS SKD12
Applications
空淬冷作模具钢。,"Bar
Available Forms
Block"
Uses
Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Molybdenum (≈1.5%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈1.8%) increases toughness and impact strength at low temperature. 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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