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SAE-AISI H24 (T20824) Tungsten Hot-Work Steel

SAE-AISI H24 steel is a tool steel. H24 is the designation in both the SAE and AISI systems for this material. T20824 is the UNS number.

The properties of SAE-AISI H24 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare SAE-AISI H24 steel to: tool steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Poisson's Ratio


Shear Modulus

78 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

720 to 1990 MPa 110 to 290 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Melting Completion (Liquidus)

1750 °C 3180 °F

Melting Onset (Solidus)

1700 °C 3080 °F

Specific Heat Capacity

420 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

27 W/m-K 15 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

37 % relative


9.1 g/cm3 570 lb/ft3

Embodied Carbon

6.1 kg CO2/kg material

Embodied Energy

93 MJ/kg 40 x 103 BTU/lb

Embodied Water

78 L/kg 9.3 gal/lb

Common Calculations

PREN (Pitting Resistance)


Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

22 points

Strength to Weight: Axial

22 to 61 points

Strength to Weight: Bending

20 to 39 points

Thermal Diffusivity

6.9 mm2/s

Thermal Shock Resistance

22 to 61 points

Alloy Composition

Iron (Fe)Fe 78 to 82.4
Tungsten (W)W 14 to 16
Chromium (Cr)Cr 2.5 to 3.5
Vanadium (V)V 0.4 to 0.6
Carbon (C)C 0.42 to 0.53
Manganese (Mn)Mn 0.15 to 0.4
Silicon (Si)Si 0.15 to 0.4
Nickel (Ni)Ni 0 to 0.3
Copper (Cu)Cu 0 to 0.25
Phosphorus (P)P 0 to 0.030
Sulfur (S)S 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A681: Standard Specification for Tool Steels Alloy

Tool Steels, 5th ed., George Roberts et al., 1998

Tool Steels: Properties and Performance, Rafael A. Mesquita (editor), 2016

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015