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Latrobe Viscount 20® Free Machining Tool Steel (ASTM H13S)
| Category | Metal , Ferrous Metal , Alloy Steel , Tool Steel |
| Manufacturer | Latrobe Steel |
| Trade Name | Viscount |
| Port | Ningbo port,China |
| Trade Terms | FOB, CFR, CIF |
| Payment Terms | L/C, T/T, Western Union |
| Download PDF | Latrobe Viscount 20® Free Machining Tool Steel (ASTM H13S).pdf  |
| Price | EMAIL US sales@lookpolymers.com |
Material Notes:
Viscount 20 tool steel is a resulfurized H13 tool steel. The distribution of alloy sulfide particles in the microstructure enhances the machinability of the steel in the annealed condition. In addition, the alloy sulfides improve grindability in the hardened condition and make the steel machinable by conventional chip-cutting techniques if the hardness is kept below about 46 HRC. A steel having the same chemical composition, but which is prehardened to 42 to 46 HRC is sold as Viscount 44. Both Viscount 20 and Viscount 44 are excellent selections for numerous hot work and cold work tooling applications where machinability is of primary importance.Information Provided by Timken Latrobe Steel.Timken sold Latrobe in December 2006. They are now Latrobe Specialty Steels Co.
| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Specific Gravity | 7.75 g/cc | 7.75 g/cc | |
| Density | 7.75 g/cc | 0.280 lb/in³ |
| Mechanical Properties | Metric | English | Comments |
|---|---|---|---|
| Hardness, Rockwell C | 50 | 50 | Air Cooled from 982°C, 30 minutes |
| 52.5 | 52.5 | Air Cooled from 1010°C, 30 minutes | |
| 54 | 54 | Air Cooled from 1032°C, 30 minutes | |
| Modulus of Elasticity | 207 GPa | 30000 ksi | |
| 159 GPa @Temperature 538 °C |
23000 ksi @Temperature 1000 °F |
||
| 186 GPa @Temperature 204 °C |
27000 ksi @Temperature 400 °F |
||
| Machinability | 110 % | 110 % | 1% Carbon Steel |
| Thermal Properties | Metric | English | Comments |
|---|---|---|---|
| CTE, linear | 11.3 µm/m-°C @Temperature 21.0 - 204 °C |
6.28 µin/in-°F @Temperature 69.8 - 399 °F |
|
| 13.5 µm/m-°C @Temperature 21.0 - 538 °C |
7.50 µin/in-°F @Temperature 69.8 - 1000 °F |
||
| Thermal Conductivity | 17.6 W/m-K @Temperature 27.0 °C |
122 BTU-in/hr-ft²-°F @Temperature 80.6 °F |
|
| 23.4 W/m-K @Temperature 204 °C |
162 BTU-in/hr-ft²-°F @Temperature 399 °F |
||
| 26.8 W/m-K @Temperature 649 °C |
186 BTU-in/hr-ft²-°F @Temperature 1200 °F |
| Component Elements Properties | Metric | English | Comments |
|---|---|---|---|
| Carbon, C | 0.40 % | 0.40 % | |
| Chromium, Cr | 5.25 % | 5.25 % | |
| Iron, Fe | 90.08 % | 90.08 % | |
| Manganese, Mn | 0.80 % | 0.80 % | |
| Molybdenum, Mo | 1.35 % | 1.35 % | |
| Silicon, Si | 1.0 % | 1.0 % | |
| Sulfur, S | 0.12 % | 0.12 % | |
| Vanadium, V | 1.0 % | 1.0 % |
| Chemical Properties | Metric | English | Comments |
|---|---|---|---|
| Critical Temperature | 802 °C | 1480 °F | Ar1 |
| 826 °C | 1520 °F | Ar3 | |
| 840 °C | 1540 °F | Ac1 | |
| 890 °C | 1630 °F | Ac3 |
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