Toolman Special Steels is proud to produce and offer D2 (1.2379) - a high-carbon, high-chromium tool steel known for its excellent wear resistance and stability. It is commonly used for tools requiring high resistance to abrasive and adhesive wear. It is characterised by high wear resistance, superior ductility, extremely low deformation, and hardening crack tendency. It has very high hardenability and significant dimensional stability during the quenching process.
Steel Properties
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Wear resistance.
-
Impact resistance.
-
Fine grain size.
-
Uniform distribution of carbide.
-
High toughness.
Extremely low gas content
Good cleanliness
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| C | 1.4 | 1.6 |
| Si | 0.10 | 0.6 |
| Mn | 0.1 | 0.6 |
| P | - | 0.030 |
| S | - | 0.030 |
| Cr | 11 | 13 |
| Mo | 0.7 | 1.2 |
| V | 0.5 | 1.1 |
Mechanical Properties
| Property | Value |
|---|---|
| Hardness (HBW) | 255 max (Annealed) |
| Quenching and Tempering Hardness (HRC) | 59 min (Annealed) |
| Poisson’s Ratio | 0.27-0.30 |
| Impact Toughness | 77 J/cm2 |
| Tensile Strength | 1860-2060 MPa |
| Yield Strength | 1600-1800 MPa |
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.7 |
Modulus of Elasticity
| Temperature (°C) | GPa |
|---|---|
| 20 | 210 |
Thermal Properties
| Temperature (℃) | Thermal Expansion Coefficient (10^-6/℃) |
|---|---|
| 400 | 13.8 |
| 500 | 14.1 |
Thermal Conductivity
| Temperature (℃) | Thermal Conductivity (W/m•K) |
|---|---|
| 20 | 20 |
HEAT TREATMENT AND PROCESSES
Heat treatment
| Process | Temperature | Duration | Cooling Method |
|---|---|---|---|
| Soft Annealing | 820 - 850 | 2-5 hours | Furnace |
| Stress-relief Annealing | 600 - 650 | min 4 hrs | Furnace |
| Hardening | 1000 - 1050 | Group III | oil, air, WB 500°C |
| Tempering | 480 - 580 see tempering curve | min 2 hrs Depending on cross section | still air |
| Tempering °C | HRC |
|---|---|
| 100 | 63 |
| 200 | 61 |
| 300 | 58 |
| 400 | 58 |
| 500 | 59 |
| 525 | 58 |
| 550 | 56 |
| 600 | 51 |
Applications
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Punches and dies
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Shear blades
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Tooling for plastics
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Tyre Shredders
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Cold forming tools
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Rollers and knives for industrial cutting applications
High performance cutting tools, stamping, woodworking, drawing, deep drawing and pressing tools
for ceramics and pharmaceutical industries, rolls, measuring tools, plastic moulds, shear blades
Quality Assurance
Our D2 1.2379 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 D2 1.2379 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 |
Frequently Asked Questions
We manufacture D2 / DIN 1.2379 / AISI D2 as a high-carbon, high-chromium cold work tool steel. It offers:
- High wear resistance
- Good dimensional stability
- High toughness
- Fine grain size
- Uniform carbide distribution
- Very high hardenability
Its resistance to abrasive and adhesive wear makes it suitable for demanding cutting, forming and stamping applications.
We supply D2 for a wide range of industrial tooling, including:
- Punches and dies
- Shear blades
- Cold-forming tools
- Industrial rollers and knives
- Tyre shredders
- Stamping tools
- Drawing and deep-drawing tools
- Pressing tools
- Measuring tools
- Plastic moulds
It is also used in tooling for ceramics, pharmaceutical manufacturing and woodworking applications.
Our D2 steel has:
- Maximum annealed hardness: 255 HBW
- Minimum quenching and tempering hardness: 59 HRC
Our tempering data shows approximately 63 HRC at 100°C, 59 HRC at 500°C and 51 HRC at 600°C.
Our heat-treatment guidance includes:
- Soft annealing: 820–850°C
- Stress-relief annealing: 600–650°C
- Hardening: 1000–1050°C
- Tempering: 480–580°C
Hardening may be followed by oil, air or a warm bath at 500°C, depending on the process requirement.
Our D2 composition includes:
- Carbon: 1.40–1.60%
- Chromium: 11.00–13.00%
- Molybdenum: 0.70–1.20%
- Vanadium: 0.50–1.10%
- Silicon: 0.10–0.60%
- Manganese: 0.10–0.60%
Phosphorus and sulphur are limited to a maximum of 0.030% each.
Our D2 manufacturing range includes:
- Hot-rolled bars: 8–65 mm diameter
- Forged and turned bars: 65.2–500 mm diameter
- Forged square bars: 50–500 mm
- Flats: 6–410 mm thickness
- Flat widths: 20–700 mm
Exact size, condition and availability should be confirmed at the enquiry stage.
Yes. We subject our D2 / DIN 1.2379 steel to testing and quality control and provide certificates and test reports on request. Manufacturers can also share their required dimensions, quantity, application and supply conditions with us before ordering.
