SAE-AISI H23 (T20823) Tungsten Hot-Work Steel

SAE-AISI H23 steel is a tool steel. H23 is the designation in both the SAE and AISI systems for this material. T20823 is the UNS number.

The properties of SAE-AISI H23 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 H23 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.

Annealed H23 Tool Steel Hardened H23 Tool Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 30 x 10⁶ psi

Poisson's Ratio

0.28

Shear Modulus

80 GPa 12 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

760 to 1550 MPa 110 to 220 x 10³ psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Melting Completion (Liquidus)

1680 °C 3060 °F

Melting Onset (Solidus)

1630 °C 2960 °F

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

20 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

34 % relative

Density

8.7 g/cm³ 540 lb/ft³

Embodied Carbon

6.9 kg CO₂/kg material

Embodied Energy

110 MJ/kg 46 x 10³ BTU/lb

Embodied Water

120 L/kg 14 gal/lb

Common Calculations

PREN (Pitting Resistance)

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

22 points

Strength to Weight: Axial

24 to 49 points

Strength to Weight: Bending

21 to 34 points

Thermal Diffusivity

5.2 mm²/s

Thermal Shock Resistance

23 to 47 points

Alloy Composition

Iron (Fe)Fe		71.3 to 76.7
Chromium (Cr)Cr		11 to 12.8
Tungsten (W)W		11 to 12.8
Vanadium (V)V		0.75 to 1.3
Silicon (Si)Si		0.15 to 0.6
Carbon (C)C		0.25 to 0.35
Manganese (Mn)Mn		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