O1
OtherO1
Hot-work tool steel. (YB/T 5301; equiv ASTM A681 / DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.85 |
|---|---|
| MN | 1 |
| CR | 0.4 |
| W | 0.4 |
| SI | 0.5 |
| P | 0.03 |
| S | 0.03 |
Mechanical Properties
Hardness(annealed):≤212 HB;Hardness(hardened):57-62 HRC
Chinese Standard
T 5301 O1
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 (≈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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