Chemical Composition of Tool Steel H11
Element Min (%) Max (%) Carbon, C 0.38 0.43 Manganese, Mn 0.20 0.40 Silicon, Si 0.80 1.00 Sulfur, S – 0.015 Phosphorus, P – 0.015 Chromium, Cr 4.75 5.25 Molybdenum, Mo 1.20 1.40 Vanadium, V 0.40 0.60 Nickel, Ni – 0.25 Copper, Cu – 0.35 Iron, Fe – *Balance *Not exclusively to the element mentioned, but that one predominates other elements that are used only in minimal quantities.
Fabrication and Working Instructions
Tool Steel H11 can be easily formed using conventional methods for machining and forging. For forging the preferred temperature is 2050° F (1121° C), with 1650° F (899° C) being the lowest recommended point. H11 can also be cold-worked and welded with conventional methods for steels in this group. That said, machinability of H11 is 75% to that of steels in the “W” group.
Mechanical and Physical Properties of Tool Steel H11
Property Imperial Metric Density 0.282 lb/in³ 7.81 g/cc Melting Point 2600°F 1427°C Tensile Strength 260 ksi 1792 MPa Tensile Strength, Yield 215 ksi 1482 MPa Elongation in 4D 8 % 8 % Reduction of Area 30 % 30 % Hardness, Rockwell C
Air cooled from 1800°F (982°C) for 45 minutes)52.5 52.5 Hardness, Rockwell C
Air cooled from 1850°F (1010°C) for 45 minutes)56 56 Hardness, Rockwell C
Air cooled from 1900°F (1038°C) for 45 minutes)57 57 Charpy impact
V-notch; air-cooled from 1850°F (1010°C) and then tempered at 535°C10.0 ft-lb 13.6 J Charpy impact
V-notch; air-cooled from 1850°F (1010°C) and then tempered at 1200°F (650°C)20.0 ft-lb 27.1 J Charpy impact
V-notch; air-cooled from 1850°F (1010°C) and then tempered at 700°F (370°C)25.0 ft-lb 33.9 J Poisson’s Ration 0.27 – 0.30 0.27 – 0.30 Machinability (relative rating for 1% Carbon Steel) 75-80 % 75-80 % Transverse Tensile Properties
Property Imperial Metric Tensile Strength 260 ksi 1792 MPa Tensile Strength, Yield (0.2% Offset) 215 ksi 1482 MPa Individual Value 6 % 6 % Average Value 15 % 15 % Thermal Properties of Tool Steel H11
| Property | Imperial | Metric |
|
Thermal Expansion (at the temperature range of 68-112° F / 20-100° C) |
6.63 µin/in°F | 11.9 x 10-6/ºC |
| Thermal Conductivity(at 212° F / 100° C) | 292.9 in/hr.ft².°F | 42.2 W/mK |
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