H21, / DIN 1.2581 , / AISI 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. These steels have similar characteristics to that of high-speed steels. The primary alloying elements in tungsten hot-work steels include tungsten, chromium, carbon, and vanadium. This alloy produced by Toolman is one of the hot work, tungsten containing tool steels. The tungsten content is beneficial for hot strength at red heat, although toughness is somewhat reduced. This is mostly utilised as hot work devices, instruments for manufacture of hollows, screws, rivets, nuts and bolts. Die casting tools, forming dies, die inserts, hot shear blades.
Steel Properties
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Tungsten containing hot work tool steel beneficial for hot strength at red heat, although toughness is somewhat reduced
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High resistance to the hot tempering and good toughness.
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Very high firmness during the heat and resistance to the tempering
Chemical Composition (Typical Analysis in %)
| Element | C (%) | Si (%) | Mn (%) | P (≤ %) | S (≤ %) | Cr (%) | W (%) | V (%) |
|---|---|---|---|---|---|---|---|---|
| % | 0.26-0.36 | 0.15-0.40 | 0.15-0.40 | 0.030 max | 0.030 max | 3.00-3.75 | 8.50-10.00 | 0.30-0.60 |
Mechanical Properties
| ITEMS | Value |
|---|---|
| Hardness | 40.0 – 55.0 HRC |
| Bulk modulus | 140 GPa |
| Poisson’s ratio | 0.27-0.30 |
| Elastic modulus | 190-210 GPa |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Thermal Conductivity | 27.0 W/m•K |
| Electric Resistivity | 0.52 Ohm•mm²/m |
| Specific Heat Capacity | 0.46 J/g•K |
Modulus of Elasticity
| Property | Value |
|---|---|
| Modulus of Elasticity | 190-210 GPa |
Coefficient of Linear Thermal Expansion
| Temperature Range (°C) | Expansion Coefficient (10⁻⁶ /°C) |
|---|---|
| 20-100 | 11.5 |
| 20-200 | 12.0 |
| 20-300 | 12.2 |
| 20-400 | 12.5 |
| 20-500 | 12.9 |
| 20-600 | 13.0 |
| 20-700 | 13.5 |
Mechanical Properties
| Property | Value |
|---|---|
| Hardness (Annealed) | Max 240 HB |
| Hardness (Quenched) | 47-53 HRC |
HEAT TREATMENT AND PROCESSES
| 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 | 47 -53 |
Tempering
| Tempering °C | HRC |
|---|---|
| 400 | 49 |
| 500 | 49 |
| 550 | 51 |
| 600 | 50 |
| 650 | 46 |
| 700 | 36 |
Applications
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Hot working dies and tooling
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Die casting
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Extrusion
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Hot forming of parts
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Moulds for copper and copper alloys
Quality Assurance
Our H21, / DIN 1.2581 , / AISI H21 steel undergoes rigorous testing and quality control to meet international standards, ensuring consistent performance and reliability. Certificates and test reports are available upon request. Feel free to reach out to us for more information on our H21 steel products or to discuss your specific requirements. We're dedicated to providing top-quality steel solutions that meet your needs and exceed your expectations.
Manufacturing Range
| Products | Diameter (mm) |
|---|---|
| Hot Rolled bar | 8 - 65 |
| Forged and Turned bars | 65.2 - 500 |
| Forged Square Bars | 50 - 500 |
Flats
| THICKNESS | WIDTH |
|---|---|
| 6.00 mm - 410.00 mm | 20.00 mm - 700.00 mm |