Toolman Special Steels is proud to produce and offer T4 (1.3255) - AISI T4 tool steel is one of tungsten type high speed tool steel, which belongs to ASTM A600 specification, the standard for high speed tool steel materials. ASTM T4 tool steel is similar to T1 Tool Steel materials, but with 4.25~5.75% cobalt added to increase heat resistance. The red hardness of T4 steel and the high temperature hardness is a little higher than T1 tool steel. AISI T4 tool steel is a deep hardening alloy capable of Rockwell C 64 hardness.
Steel Properties
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High duty High-Speed-Steel on tungsten base.
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Deep hardening response
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Good toughness and cutting capability
Chemical Composition
| Element | Value |
|---|---|
| C | 0.81 |
| Cr | 4.30 |
| Mo | 0.65 |
| W | 18.00 |
| Co | 4.80 |
| V | 1.50 |
Mechanical Properties
| Property | Value |
|---|---|
| Hardness (HB) | 265 max (Annealed) |
| Quenching and Tempering Hardness (HRC) | 64 - 65 |
| Poisson’s ratio | 0.27 - 0.30 |
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 8.7 |
Modulus of Elasticity
| Temperature (°C) | kN/mm² |
|---|---|
| 20 | 217 |
Thermal Properties
| Temperature (℃) | Thermal Expansion Coefficient (10^-6/°C) |
|---|---|
| 500 | 11.3 |
| 600 | 11.4 |
Thermal Conductivity
| Temperature (℃) | Thermal Conductivity (W/m•K) |
|---|---|
| 20 | 19 |
HEAT TREATMENT AND PROCESSES
Heat treatment
| Process | Temperature (°C) | Details |
|---|---|---|
| Soft Annealing | Heat to 820-850°C, slow cool to 550°C, then air cool | Maximum Brinell hardness of 265 |
| Stress Relieving | HHeat to 600-650°C, hold for 1 hour, then air cool | Removes machining stresses to reduce distortion during heat treatment |
| Hardening | Heat to 1260-1290°C, quench in oil, air, or warm bath at 550°C | Hardness after quenching: 63-66 HRC |
| Tempering | 2x at 560-580°C | Hardness after tempering: 64-65 HRC |
| Tempering °C | HRC |
|---|---|
| 100 | 65 |
| 200 | 63 |
| 250 | 62 |
| 300 | 61.5 |
| 400 | 62.5 |
| 500 | 65 |
| 550 | 65.5 |
| 600 | 63 |
| 650 | 55 |
Applications
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Cutting tools
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Broaches and Cold extrusion punches
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Turning
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Planing and Milling cutters for roughing work
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Grey cast iron
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Chill castings NF metals & non-metal material
Quality Assurance
Our T4 1.3255 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 T4 1.3255 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
| ROUNDS | SQUARES | ||
|---|---|---|---|
| SIZE (MM) | CONDITION | SIZE (MM) | CONDITION |
| 6.00 - 14.00 | CG | 7.2, 8.8, 10.5, 11 | HRA |
| 15.00 - 50.00 | HRAP | 13.5, 14, 17.5, 21 | HRA |
| 52.00 - 405.00 | FAT | 27, 32, 40 | HRA |
| 52.00 - 305.00 | FA |
Flats
| THICKNESS | WIDTH | CONDITION |
|---|---|---|
| 5.00 - 32.00 | 21.00 - 105.00 | HRA |
| 32.00 - 105.00 | 40.00 - 205.00 | FA |