CALMAX
OtherCALMAX / UDDEHOLM
Cold work tool steel with excellent toughness. Bridge between D2 and PM grades.
Chemical Composition (%)
| C | 0.5 |
|---|---|
| SI | 0.2 |
| MN | 0.3 |
| CR | 4 |
| MO | 2 |
| V | 0.2 |
| P | 0.025 |
| S | 0.005 |
Mechanical Properties
Hardness(annealed):≤240 HB;Hardness(hardened):56-62 HRC
Equivalent Grades
Uddeholm CALMAX / Calmax
Applications
Thin blanking, fineblanking, heavy punching
Available Forms
Block,Plate
Uses
Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈4.5%) improves hardenability, wear and corrosion resistance. Molybdenum (≈2.25%) raises high-temperature strength and prevents temper embrittlement. Vanadium (≈0.3%) refines grain and strengthens the tempered structure. 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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