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Designation by Standards

Steel No. DIN EN AISI JIS ГОСТ
1.2343 X38CrMoV5-1 † X37CrMoV5-1 H11 SKD6 4Ch5MFS


Chemical Composition (in weight %)

C Si Mn Cr Mo Ni V W Others
0.38 1.0 0.40 5.10 1.25 - 0.40 - -


Description
H11 steel is one of the Hot Work, Chromium type tool steels. It is relatively low in carbon content and has good toughness and deep hardens by air quench from heat treatment. Good combination of toughness, hardness and wear resistance in hot. Resistance to softening and to cracking.

Applications
H11 is often used for highly stressed structural parts such as aircraft landing gear. It resists softening at temperatures up to 537oC while retaining good ductility and toughness even at strength levels on the order of 275 ksi. Tools for hot forging of light metal. Pressure die casting tools. Dies, mandrels, punchers, knives, moulds. This grade can be water cooled. For most highest requirements we recommended UTOPMO1 EFS.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 215, 176 (at 500oC), 165 (at 600oC)
Density [g/cm3]: 7.80, 7.64 (at 500oC), 7.60 (at 600oC)
Thermal conductivity [W/m.K]: 25, 28.5 (at 500oC), 29.3 (at 600oC)
Electric resistivity [Ohm mm2/m]: 0.52, 0.86 (at 500oC), 0.96 (at 600oC)
Specific heat capacity[J/g.K]: 0.46, 0.55 (at 500oC), 0.59 (at 600oC)

Coefficient of Linear Thermal Expansion 10-6 oC-1

20-100oC 20-200oC 20-300oC 20-400oC 20-500oC 20-600oC 20-700oC 20-700oC
9.8 12.5 13.0 13.2 13.5 13.7 13.8 14.0


Soft Annealing
Heat to 800-840oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 229.

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
Harden from a temperature of 1000-1040oC followed by air, oil quenching or warm bath quenching 500-550oC. Hardness after quenching is 50-56 HRC.

Tempering
Tempering temperature: See the data bellow.

Tempering Temperature (oC) vs. Hardness (HRC)

100oC 200oC 300oC 400oC 500oC 550oC 600oC 650oC 700oC
53 52 52 52 54 52 48 38 30
1845 1790 1790 1790 1910 1790 1570 1200 970


Forging
Hot forming temperature: 1100-900oC.

Cold Working
Cold working may readily be accomplished on H11 by conventional methods.

Machinability
Machinability is reasonably good, approximately 75% that of the W group water hardening low alloy tool steels.

Corrosion Resistance
This is a steel alloy and not corrosion resistant. It will rust unless protected.

Welding
H11 is a readily weldable alloy by conventional methods.

Remark
All technical information is for reference only.