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Tool Steel H11

H-11 tool steel is widely used in the aerospace industry. Photo © infomatique / Flickr

H-11 tool steel is widely used in the aerospace industry. Photo © infomatique / Flickr

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  
AMS 6437 Plate H11 Tool Steel T20811 - Plate AMS 6437 Plate
AMS 6437 Sheet H11 Tool Steel T20811 - Sheet AMS 6437 Sheet
AMS 6437 Strip H11 Tool Steel T20811 - Strip AMS 6437 Strip
AMS 6485 H11 Tool Steel T20811  
AMS 6485 Bar H11 Tool Steel T20811 QQ-T-750 Bar AMS 6485 Bar
AMS 6485 Forging H11 Tool Steel T20811 QQ-T-750 Forging AMS 6485 Forging
AMS 6487 H11 Tool Steel T20811  
AMS 6487 Bar H11 Tool Steel T20811 - Bar AMS 6487 Bar
AMS 6487 Forging H11 Tool Steel T20811 - Forging AMS 6487 Forging
AMS 6488 H11 Tool Steel T20811  
AMS 6488 Bar H11 Tool Steel T20811 - Bar AMS 6488 Bar
AMS 6488 Forging H11 Tool Steel T20811 - Forging AMS 6488 Forging