Hot Work Tool Steels Mat.No. 1.2343, DIN X38CrMoV5-1, AISI H11 block

Designation by Standards

Chemical Composition (in weight %)

Description:

H11 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 537°C 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. 

Physical properties (average values) at ambient temperature

Modulus of elasticity [103 x N/mm2]: 215, 176 (at 500°C), 165 (at 600°C) 

Density [g/cm3]: 7.80, 7.64 (at 500°C), 7.60 (at 600°C)

Thermal conductivity [W/m.K]: 25, 28.5 (at 500°C), 29.3 (at 600°C) 

Electric resistivity [Ohm mm2/m]: 0.52, 0.86 (at 500°C), 0.96 (at 600°C)

Specific heat capacity[J/g.K]: 0.46, 0.55 (at 500°C), 0.59 (at 600°C)

Coefficient of Linear Thermal Expansion 10ˉ6 °C-1

Soft Annealing

Heat to 800-840°C, 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 650°C, 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 1000-1040°C followed by air, oil quenching or warm bath quenching 500-550°C. Hardness after quenching is 50-56 HRC.

Tempering

Tempering temperature: See the data bellow.

Tempering Temperature (°C) vs. Hardness (HRC)

Forging

Hot forming temperature: 1100-900°C. 

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.

Forms manufactured: Please see the  Dimensional Sales Program.