Toolman Special Steels is proud to produce and offer T1 (1.3355) - one of the original tungsten high speed steels, although all tungsten steel grades are used to a limited extent because of the cost and questionable availability of tungsten. T1 high speed steel is an air or oil hardening tool steel which has good comprehensive performance. The material exhibits excellent wear resistance and resistance to softening. It also offers good toughness, effective cutting performance, and a strong response to deep hardening.
Steel Properties
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Tungsten high - speed tool steel
Very high resistance to wear and to softening
Good toughness and cutting capability
Deep hardening response
Chemical Composition
| Element | Value |
|---|---|
| C | 0.75 |
| Cr | 4.10 |
| Mo | - |
| W | 18.00 |
| Co | - |
| V | 1.10 |
Mechanical Properties
| Property | Value |
|---|---|
| Hardness (HBW) | 230 - 300 (Annealed) |
| Quenching and Tempering Hardness (HRC) | 62-66 |
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 | 11.8 |
| 600 | 12 |
Thermal Conductivity
| Temperature (℃) | Thermal Conductivity (W/m•K) |
|---|---|
| 20 | 19 |
HEAT TREATMENT AND PROCESSES
Heat treatment
| Process | Temperature (°C) | Procedure Details | Cooling Method |
|---|---|---|---|
| Soft Annealing | 850-900 | Heat to 850 - 900°C | Cool slowly in furnace to about 700°C, then air cool |
| Stress Relieving | 600-700 | Heat to 600-700°C, hold for 2 hours | Cool in still air |
| Hardening | 2nd Step: 850-900 | Heat to 1210-1240°C for high hardness, 1190-1210°C for toughness | |
| Tempering | 540-620 | Heat to 540-620°C, hold for at least 2 hours per 25 mm thickness, usually triple tempering | Cool in still air |
Applications
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Turning
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Planing and Slotting Tools
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Taps
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Spiral Drills
Threading Dies
Profile Cutting Tools
Broaching tools
Reamers
Quality Assurance
Our T1 1.3355 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 T1 1.3355 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 |
Frequently Asked Questions
T1 / DIN 1.3355 / AISI T1 is a tungsten-based high speed tool steel. Toolman describes it as offering very high resistance to wear and softening, good toughness, effective cutting capability and a deep-hardening response. These properties support its use in cutting and machining tools exposed to heat and repeated wear.
Toolman lists T1 for turning tools, planing and slotting tools, taps, spiral drills, threading dies, profile-cutting tools, broaching tools and reamers. These applications make the grade relevant to manufacturers of cutting, drilling and precision machining tools.
Toolman publishes an annealed hardness range of 230–300 HBW and a quenching-and-tempering hardness range of 62–66 HRC for T1 steel.
Toolman specifies soft annealing at 850–900°C, stress relieving at 600–700°C, hardening at 1210–1240°C for higher hardness or 1190–1210°C for toughness, and tempering at 540–620°C. Triple tempering is usually recommended in its published procedure.
Toolman publishes T1 with 0.75% carbon, 4.10% chromium, 18.00% tungsten and 1.10% vanadium. Molybdenum and cobalt are shown as not added in the published composition table.
Toolman lists T1 rounds from 6–405 mm, depending on condition. Squares include listed HRA dimensions from 7.2–40 mm and forged-annealed squares from 52–305 mm. Flats range from 5–105 mm thickness and 21–205 mm width, depending on condition.
Yes. Toolman states that its T1 / 1.3355 steel undergoes testing and quality control and that certificates and test reports are available upon request. Its enquiry form also allows buyers to specify grade, size, quantity and company details when requesting material.
