Designation by Standards
| Steel No. | DIN | EN | AISI | JIS | ГОСТ |
| 1.3355 | S18-0-1 † | HS18-0-1 | T1 | SKH2 | R18 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.75 | max. 0.45 | max. 0.45 | 4.10 | - | - | 1.10 | 18.00 | - |
Description
T1 is tungsten type tool steel. Very high resistance to wear and to softening. Good toughness and cutting capability. Deep hardening response.
Applications
Turning, planing and slotting tools, tapes, twist drills, threading dies, profile cutting tools, broaching tools, reamers.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 217
Density [g/cm3]: 8.70
Thermal conductivity [W/m.K]: 19.0
Electric resistivity [Ohm mm2/m]: 0.50
Specific heat capacity[J/g.K]: 0.46
Coefficient of Linear Thermal Expansion 10-6 oC-1
| 20-100oC | 20-200oC | 20-300oC | 20-400oC | 20-500oC | 20-600oC | 20-700oC | 20-800oC |
| 9.8 | 11.1 | 11.4 | 11.7 | 11.8 | 12.0 | 12.3 | 12.3 |
Soft Annealing
Heat to 820-880oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 230-300.
Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 650oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening
Heat up to 450-600oC, then preheat to 850oC, and to 1050oC. Harden from a temperature of 1250-1290oC followed by oil, air quenching or warm bath 550oC. Hardness after quenching is 64-66 HRC.
Transformation temperatures: Ac1=824oC , Ac3=858oC.
Tempering
Tempering temperature: 3 x 1 hour at 550-570oC
Tempering Temperature (oC) vs. Hardness (HRC)
| 200oC | 300oC | 400oC | 500oC | 525oC | 550oC | 575oC | 600oC | 650oC | 700oC |
| 64 | 62 | 62 | 64 | 65 | 65.5 | 64.5 | 63 | 56 | 47 |
Forging
Hot forming temperature: 1050-900oC.
Machinability
No data.
Corrosion Resistance
Corrosion resistance of this alloy is better than that of plain carbon steels. However it will rust unless given protective treatment.
Remark
All technical information is for reference only.