H21 steel | 3Cr2W8V | Extraordinary hot work tool steel | hot Die Steel India
- Description
Description
H21 steel ( 3Cr2W8V ) an Extraordinary hot work tool steel.
AISI H21 tool steel is a high-quality Hot work tool steel, h21 belongs to the high-quality high carbon alloy tool steel.
Oil Quenched & Tempered Hardness is 28-35 HRC.
AISI H21 steel Annealing delivery hardness less than 251HB.
| Details | Value/Range | |
|---|---|---|
| Carbon | 0.26 - 0.36 | |
| Chromium | 3 - 3.75 | |
| Iron | Balance | |
| Manganese | 0.15 - 0.4 |
|
| Tungsten | 8.5 - 10 | |
| Silicon | 0.15 - 0.5 |
|
| Phosphorus | 0.03 max | |
| Sulphur | 0.03 max |
|
| Vanadium | 0.3 - 0.6 |
H21 steel Heat treatment.
Hardening
H21 tool steels should be heated uniformly to 1050-1100°C until completely heated through. If needed, the steels can be preheated at 300-500°C.
About 30 min/per 25 mm of the ruling section is to be provided and then the steels should be immediately quenched in the air.
Annealing
Slowly heated to 800~851 ℃ and allow enough times, let the steel be thoroughly heated, Then cool slowly at a Maximum of 4°C per hours.
The H21 tool steel will get MAX 235 HB.
Tempering
Tempering of H21 steels is performed at 600-650°C, Soak well at the selected temperature and soak for at least one hour per 25mm of the total thickness.
Get Rockwell C hardness of 50 MAX.
Forging
Heat to 900-1100 °C forged temperature, not below 843°.
