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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
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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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