Description of H11 Tool Steel Plate
H11 tool steel is a hot‐work tool steel containing 5% chromium. It contains less vanadium than the widely used H13 hot‐work tool steel. Consequently, it exhibits an increased toughness while the measured wear resistance and temper resistance are slightly lower. H11 tool steel is formulated as a deep‐hardenable, air‐hardening steel and undergoes minimal dimensional change during heat treatment. It demonstrates resistance to thermal fatigue cracking (as verified by thermal testing) and maintains stability against coarse crack formation and thermal shock when water cooled in service. H11 tool steel is recommended for hot tool applications where crack resistance is critical. These applications include hot stamping, die‐casting tools, forging dies, hot shear knives, hot gripper dies and extrusion tools.

Specifications for H11 Tool Steel Plates
Element
|
Content (%)
|
Carbon
|
0.33 - 0.43
|
Chromium
|
4.75 - 5.5
|
Iron (balance)
|
Balance
|
Manganese
|
0.2 - 0.5
|
Molybdenum
|
1.1 - 1.6
|
Phosphorus
|
0.03 maximum
|
Silicon
|
0.8 - 1.2
|
Sulphur
|
0.03 max.
|
Vanadium
|
0.3 - 0.6
|
Properties
|
Metric
|
Imperial
|
Hardness, Rockwell C (air‐cooled from 982°C, 45 min.)
|
52.5
|
52.5
|
Hardness, Rockwell C (air‐cooled from 1010°C, 45 min.)
|
56
|
56
|
Hardness, Rockwell C (air‐cooled from 1038°C, 45 min.)
|
57
|
57
|
Elastic modulus
|
207 GPa
|
30 000 ksi
|
Elastic modulus (@538°C/1000°F)
|
159 GPa
|
23 000 ksi
|
Elastic modulus (@204°C/400°F)
|
190 GPa
|
27 500 ksi
|
Charpy impact energy (V‐notch; air‐cooled from 1010°C; 650°C temper temperature)
|
27.1 J
|
20.0 ft-lb
|
Charpy impact energy (V‐notch; air‐cooled from 1010°C; 370°C temper temperature)
|
33.9 J
|
25.0 ft-lb
|
Machinability (1% carbon steel)
|
75.0 - 80.0%
|
75.0 - 80.0%
|
Poisson's ratio
|
0.27-0.30
|
0.27-0.30
|
Applications of H11 Tool Steel Plates
- Hot stamping
- Die-casting tools
- Forging dies
- Hot shear knives
- Hot gripper dies
- Extrusion tools