Tech Steel & Materials
Tool Steel H11
H-11 tool steel is a 5% chromium hot work steel that is characterized by excellent impact toughness. It contains less vanadium than the widely-used H13 tool steel. This provides for the higher toughness, with some reduction in wear resistance and temper resistance. H11 tool steel is a deep-hardening, air-hardening steel that exhibits minimal size change during heat treatment. The steels are subjected to minimal distortion during hardening due to their balanced alloy content. It has good resistance to thermal fatigue cracking (heat checking) and excellent resistance to gross cracking and thermal shock when water cooled in service. H11 tool steel is recommended for hot tooling applications where maximum resistance to cracking is required. Such applications include hot punches, die casting dies, forging dies, hot shear blades, hot gripper dies, and extrusion tooling. The tools produced from chromium hot-work steels can be cooled using water without damage as these steels have low carbon and alloy contents.
The forming characteristics of H-11 H11 AMS 6487 Tool Steel are good by conventional methods. It also may be formed by forging and machining. Welding H-11 AMS 6487 Tool Steel is a readily wieldable alloy by conventional methods. Cold working may readily be accomplished on H11 by conventional methods. Tool steel refers to a variety of carbon and alloy steels that are particularly well-suited to be made into tools. Their suitability comes from their distinct toughness, resistance to abrasion, their ability to hold a cutting edge and/or their resistance to deformation at elevated temperature.
Chemical Properties
| Element |
min |
max |
| Carbon |
0.38 |
0.43 |
| Manganese |
0.20 |
0.40 |
| Silicon |
0.80 |
1.00 |
| Phosphorus |
– |
0.015 |
| Sulfur |
– |
0.015 |
| Chromium |
4.75 |
5.25 |
| Molybdenum |
1.20 |
1.40 |
| Vanadium |
0.40 |
0.60 |
| Nickel |
– |
0.25 |
| Copper |
– |
0.35 |
Mechanical Properties
Longitudinal Tensile Properties
| Property |
Value |
| Tensile Strength |
260 ksi |
| Yield Strength at 0.2% Offset |
215 ksi |
| Elongation in 4D |
8% |
| Reduction of Area |
30% |
Transverse Tensile Properties
Property Value Tensile Strength 260 ksi Yield Strength at 0.2% Offset 215 ksi Reduction of Area Individual Value 6% Average Value 15%
Select AMS Number:
| AMS Number |
Alloy |
Type |
UNS |
Cross Ref. Spec |
Misc./Shape |
| AMS 6437 |
H11 |
Tool Steel |
T20811 |
- |
Plate |
| AMS 6437 |
H11 |
Tool Steel |
T20811 |
- |
Sheet |
| AMS 6437 |
H11 |
Tool Steel |
T20811 |
- |
Strip |
| AMS 6485 |
H11 |
Tool Steel |
T20811 |
QQ-T-750 |
Bar |
| AMS 6485 |
H11 |
Tool Steel |
T20811 |
QQ-T-750 |
Forging |
| AMS 6487 |
H11 |
Tool Steel |
T20811 |
- |
Bar |
| AMS 6487 |
H11 |
Tool Steel |
T20811 |
- |
Forging |
| AMS 6488 |
H11 |
Tool Steel |
T20811 |
- |
Bar |
| AMS 6488 |
H11 |
Tool Steel |
T20811 |
- |
Forging |
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