Tool steels are high quality steels developed with controlled chemical composition to form properties essential for working and shaping of other materials. They are normally delivered to the suppliers in the soft annealed condition, which makes it easy for the manufacturer to machine the material with cutting tool for different applications.AISI T8 tool steel is a tungsten-cobalt-vanadium high-speed tool steel. The following datasheet will provide an overview of grade T8 tool steels.
The chemical composition of T8 tool steels is outlined in the following table.
| Element | Content (%) |
|---|---|
| Tungsten, W | 13.25-14.75 |
| Cobalt, Co | 4.25-5.75 |
| Chromium, Cr | 3.75-4.5 |
| Vanadium, V | 1.80-2.40 |
| Carbon, C | 0.75-0.85 |
| Molybdenum, Mo | 0.4-1 |
| Nickel, Ni | 0.3 |
| Copper, Cu | 0.25 |
| Manganese, Mn | 0.2-0.4 |
| Silicon, Si | 0.2-0.4 |
| Phosphorus, P | 0.03 |
| Sulfur, S | 0.03 |
The following table shows the physical properties of T8 tool steels.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.43 g/cm3 | 0.267 lb/in3 |
The mechanical properties of T8 tool steels are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 1158 MPa | 167.95 ksi |
| Elongation | 15% | 15% |
| Modulus of elasticity | 190-210 GPa | 27557- 30457 ksi |
| Poisson’s ratio | 0.27-0.3 | 0.27-0.3 |
The thermal properties of T8 tool steels are given in the following table
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient | 16-17 µm/m°C | 8.8-9.4 µin/in°F |
| Thermal conductivity | 16 W/mK | 110 BTU.in/hrft².°F |
| Product type | Products | Dimension | Processes | Deliver Status |
|---|---|---|---|---|
| Plates / Sheets | Plates / Sheets | 0.08-200mm(T)*W*L | Forging, hot rolling and cold rolling | Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting |
| Steel Bar | Round Bar, Flat Bar, Square Bar | Φ8-1200mm*L | Forging, hot rolling and cold rolling, Cast | Black, Rough Turning, Shot Blasting, |
| Coil / Strip | Steel Coil /Steel Strip | 0.03-16.0x1200mm | Cold-Rolled & Hot-Rolled | Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting |
| Pipes / Tubes | Seamless Pipes/Tubes, Welded Pipes/Tubes | OD:6-219mm x WT:0.5-20.0mm | Hot extrusion, Cold Drawn, Welded | Annealed, Solution and Aging, Q+T, ACID-WASHED |
| Grade | Standard | Country | Application |
|---|---|---|---|
| T8 | ASTM | USA | High-Speed Tool Steel |
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