Toolman Special Steels is proud to produce and offer A8 M / AISI A8 MOD Steel. AISI A8 is premium medium carbon high Cr, Mo, V alloy tool steel. When compared to D2 with a high carbon and chromium content, A8 has higher toughness. It also has better wear resistance than shock-resisting steel, such as S7 so that it is the best choice for the applications that require high strength and high mold.
Steel Properties
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Good cutting ability
-
High hardenability
-
High surface strength
-
Easy to repair and weld
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High cutting power, high wear resistance as well as excellent tempering resistance.
Chemical Composition
| Element | C (%) | Si (%) | Mn (%) | Cr (%) | Mo (%) | V (%) |
|---|---|---|---|---|---|---|
| Value | 0.52 | 0.95 | 0.40 | 8.00 | 1.40 | 0.45 |
Mechanical Properties
| Property | Value |
|---|---|
| Annealing Hardness (HBW) | 250 max |
| Quenching and Tempering Hardness (HRC) | 56 min |
| Tensile strength Rm (as received condition) | 123.2 KSI |
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.75 |
Modulus of Elasticity
| Temperature (°C) | GPa |
|---|---|
| 20 | 200 |
Thermal Properties
| Temperature (℃) | Thermal Expansion Coefficient (10^-6/℃) |
|---|---|
| 20-200 | 11.6 |
Thermal Conductivity
| Temperature (℃) | Thermal Conductivity (W/m•K) |
|---|---|
| 20 | 26.1 |
HEAT TREATMENT AND PROCESSES
Heat treatment
| Soft annealing °F | Cooling | Hardness HB |
|---|---|---|
| 1526 - 1580°F | Furnace | Max 250 |
| Stress-relief annealing °F | Cooling |
|---|---|
| approx. 1202°F | Furnace |
| Hardening °F | Quenching | Hardness after quenching HRC |
|---|---|---|
| 1886 - 1958°F | Air, oil, hot basin (1022°F) | 56 min |
| Tempering °C | HRC |
|---|---|
| 100 | 61 |
| 200 | 60 |
| 300 | 58 |
| 400 | 58 |
| 500 | 60 |
| 500 | 57 |
| 600 | 53 |
Applications
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Applications severely stressed machine blades for cellulose and paper industries
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Woodworking milling cutters, flat and circular blades for cutting 5 to 15 mm thick sheet/plate.
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Blanking tools, stamping tools, embossing tools, forming dies, press dies, die inserts
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Extrusion dies, reinforcements, cold extrusion tools, tube tools, cutting tools, industrial knives, wood chipping knives, veneer knives
Quality Assurance
Our A8 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 A8 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 A8M / AISI A8 MOD as a medium-carbon, high-chromium, molybdenum and vanadium alloy tool steel. Compared with D2, it offers higher toughness, while also providing better wear resistance than shock-resisting grades such as S7.
Our A8M steel offers:
- Good cutting ability
- High hardenability
- High surface strength
- Good weldability and repairability
- High wear resistance
- Strong cutting performance
- Good tempering resistance
We supply A8M for:
- Machine blades for cellulose and paper industries
- Woodworking milling cutters
- Flat and circular blades for 5–15 mm sheet or plate
- Blanking and stamping tools
- Embossing and forming dies
- Press dies and die inserts
- Extrusion dies
- Cold-extrusion and tube tooling
- Industrial, wood-chipping and veneer knives
Our A8M steel has:
- Maximum annealed hardness: 250 HBW
- Minimum quenching and tempering hardness: 56 HRC
- Tensile strength in as-received condition: 123.2 KSI
- Density: 7.75 g/cm³
Our A8M composition includes:
- Carbon: 0.52%
- Silicon: 0.95%
- Manganese: 0.40%
- Chromium: 8.00%
- Molybdenum: 1.40%
- Vanadium: 0.45%
Our published heat-treatment data includes:
- Soft annealing: 1526–1580°F
- Stress relieving: approximately 1202°F
- Hardening: 1886–1958°F
- Quenching: air, oil or hot basin at 1022°F
- Minimum hardness after hardening: 56 HRC
Our tempering data shows hardness varying with temperature, including approximately 61 HRC at 100°C and 53 HRC at 600°C.
We manufacture:
- Hot-rolled bars: 8–65 mm
- Forged and turned bars: 65.2–500 mm
- Forged square bars: 50–500 mm
- Flats: 6–410 mm thickness
- Flat widths: 20–700 mm
Certificates and test reports are available on request.
