| C 0.30-0.40 | Si 0.80-1.25 | Cr 4.75-5.50 | Mo 1.25-1.75 | V 0.20-0.50 |
AISI H12 hot work Tool Steel could be a five-hitter Cr, general hot work steel that is characterized by glorious impact toughness. It contains less vanadium than the widely-used AISI H13 hot work tool steel, and also the tungsten content provides higher temper resistance. it has smart resistance to thermal fatigue cracking (heat checking) and excellent resistance to gross cracking and thermal shock once water cooled in commission.TLS H12 hot work tool steel is usually recommended for warm tooling applications wherever most resistance to cracking is needed. Such applications embrace hot punches, die casting dies, shaping dies, hot shear blades, hot gripper dies, and extrusion tooling.
Excellent Resistance to Wear, High Strength at Elevated Temperature with good Homogenizing with High Toughness. Extra- Fine- Structure without Grain-Boundary Carbide.
| Coefficient of thermal expansionat °C | 20-100 | 20-250 | 20-500 |
| 10-6 m/(m*K) | 11.7 | 12.4 | 12.9 |
| Thermal Conductivity at °C | 20 | 250 | 500 |
| W/(m*K) | 24.2 | 25.6 | 28.0 |
This steel use for Forming dies, Press dies, Hot Shear, Immediate Roller for Cold Rolling.
| Soft annealing °C | Cooling | Hardness HB |
|---|---|---|
| 820 | Furnace | max. 240 |
| Hardening °C | Quenching | Hardness after quenching HRC |
|---|---|---|
| 1030 – 1130 | Oil or hot bath, 500 – 550 °C | 57 |
| Tempering °C after Quenching | 100 | 200 | 300 | 400 | 500 | 600 | |||
| HRC | 55 | 54 | 54.3 | 54.8 | 53 | 51 | 48 | 41 | 34 |