| C 0.26-036 | Mn 0.15-0.40 | Si 0.15-0.50 | Cr 3.00-3.75 | V 0.30-0.60 |
V.K Steel Traders
is the
largest Supplier & Stockiest of H21 Steel.
H21 Steel is a hot work tool steel for oil or air solidifying to grow high
hot quality, maintenance of hardness, and warmth checking resistance.
This is mostly utilized as hot work devices, instruments for manufacture of
hollows, screws, rivets, nuts and bolts. Die casting tools, forming dies,
die inserts, hot shear blades.
Hot work steel with good toughness include tungsten Chromium Carbon Vanadium usually is working hardness is 40.0 to 55.0 HRC size available in round, flat and square.
| Coefficient of thermal expansionat °C | 20-100 | 20-200 | 20-300 | 20-400 | 20-500 | 20-600 | 20-700 |
| 10-6 m/(m*K) | 11.2 | 11.9 | 12.2 | 12.5 | 12.8 | 13.0 | 13.2 |
| Thermal Conductivity at °C | 100 | 400 | 675 |
| W/(m*K) | 27.0 | 29.8 | 29.1 |
The H21 tungsten hot-work tool steels are mainly used for hot-working dies and tooling, e.g., die casting, extrusion and hot-forming of parts.
| Soft annealing °C | Cooling | Hardness HB |
|---|---|---|
| 780 – 810 | Slowly | max. 240 |
| Hardening °C | Quenching | Hardness after quenching HRC |
|---|---|---|
| 1000 – 1130 | Oil or hot bath, 600 – 650 °C | 53 |
| Tempering °C after Quenching | 100 | 200 | 300 | 400 | 500 | 550 | 600 | 650 | 700 |
| HRC | 49 | 49 | 49 | 49 | 51 | 51 | 50 | 46 | 36 |