Toolman Special Steels is proud to produce and offer O1 (1.2510) - This alloy is one of the cold work, oil hardening type tool steels. It is relatively inexpensive containing small amounts of manganese, tungsten and chromium. Thanks to its tungsten and higher chromium content, the O1 tool steel has good wear resistance and polishing performance. O1 has good durability, wear resistance, and fine grain size. After heat treatment, it has very small dimensional variation. It is suitable for measurement tools and drills.
Steel Properties
-
High wear resistance
-
Fine grain size
-
Good toughness.
-
Good durability
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High machinability,
Medium toughness and resistance to wear.
Dimensional stability during heat treatment.
Good cutting edge retention
Chemical Composition
| C | Si | Mn | P | S | Cr | V | W |
|---|---|---|---|---|---|---|---|
| 0.85 - 1.00 | 0.10 - 0.50 | 1.00 - 1.40 | 0.03 | 0.03 | 0.4 - 0.7 | 0.15 - 0.30 | 0.40 - 0.60 |
Mechanical Properties
| Property | Value |
|---|---|
| Annealing Hardness (HBW) | 212 max |
| Quenching and Tempering Hardness (HRC) | 59 min |
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.7 |
Modulus of Elasticity
| Temperature (°C) | GPa |
|---|---|
| 20 | 193 |
Thermal Properties
| Temperature (℃) | Thermal Expansion Coefficient (10^-6/℃) |
|---|---|
| 20 -260 | 10.6 |
Thermal Conductivity
| Temperature (℃) | Thermal Conductivity (W/m•K) |
|---|---|
| 20 | 33.4 |
HEAT TREATMENT AND PROCESSES
Heat treatment
| Heat Treatment | Temperature | Duration | Cooling |
|---|---|---|---|
| Stress Relieving | Approx. 650 °C in the annealed state | 1 hour per 50 mm wall thickness | Furnace |
| Soft Annealing | 750 °C | 1 hour per 25 mm wall thickness | Furnace |
| Hardening | 830 °C | 1 minute per mm wall thickness | - |
| Quenching Hardness | Max. 64 HRC | - | in oil, hot bath or vacuum |
| Tempering | See tempering curve | 1 hour per 25 mm wall thickness | Air |
| Working Hardness | 58–62 HRC | - | - |
| Tempering °C after Quenching | HRC |
|---|---|
| 100 | 64 |
| 200 | 62 |
| 300 | 57 |
| 400 | 53 |
Applications
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Blanking and stamping dies for cutting sheets up to 6 mm thickness
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Threading tools
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Drills
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Broaches
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Gauges, Measuring tools
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Plastic moulds
Shear blades
Guide rails
Quality Assurance
Our O1 1.2510 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 O1 1.2510 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 O1 / DIN 1.2510 / AISI O1 as an oil-hardening cold work tool steel. It contains manganese, tungsten and chromium and offers:
- Good wear resistance
- Fine grain size
- Good toughness
- High machinability
- Dimensional stability during heat treatment
- Good cutting-edge retention
- Good polishing performance
It is particularly useful where manufacturers require predictable heat-treatment behaviour and good machinability.
We supply O1 for:
- Blanking and stamping dies for sheets up to 6 mm thick
- Threading tools
- Drills
- Broaches
- Gauges
- Measuring tools
- Plastic moulds
- Shear blades
- Guide rails
Its dimensional stability and cutting-edge retention make it useful for precision tooling and measuring applications.
Our O1 steel has:
- Maximum annealed hardness: 212 HBW
- Minimum quenching and tempering hardness: 59 HRC
- Maximum quenching hardness: 64 HRC
- Working hardness: 58–62 HRC
These values allow manufacturers to select the working condition according to the tooling requirement.
Our heat-treatment guidance specifies:
- Stress relieving: approximately 650°C
- Soft annealing: 750°C
- Hardening: 830°C
- Quenching: oil, hot bath or vacuum
- Working hardness: 58–62 HRC
Our published tempering data shows approximately 64 HRC at 100°C, 62 HRC at 200°C, 57 HRC at 300°C and 53 HRC at 400°C.
Our O1 composition includes:
- Carbon: 0.85–1.00%
- Manganese: 1.00–1.40%
- Chromium: 0.40–0.70%
- Tungsten: 0.40–0.60%
- Vanadium: 0.15–0.30%
- Silicon: 0.10–0.50%
Phosphorus and sulphur are specified at 0.03%.
Our 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
Manufacturers can confirm exact size and supply-condition requirements with us during enquiry.
Yes. We subject our O1 / DIN 1.2510 steel to testing and quality control and provide certificates and test reports on request. Manufacturers can also discuss application, dimensions and required condition with our team before procurement.
