SAE-AISI H43 (T20843) Molybdenum Hot-Work Steel

SAE-AISI H43 steel is a tool steel. H43 is the designation in both the SAE and AISI systems for this material. T20843 is the UNS number.

The properties of SAE-AISI H43 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 H43 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 H43 Tool Steel Hardened H43 Tool Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 10⁶ psi

Poisson's Ratio

0.29

Shear Modulus

77 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

710 to 2140 MPa 100 to 310 x 10³ psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Melting Completion (Liquidus)

1530 °C 2780 °F

Melting Onset (Solidus)

1480 °C 2700 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

30 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

14 % relative

Density

7.9 g/cm³ 500 lb/ft³

Embodied Carbon

8.2 kg CO₂/kg material

Embodied Energy

120 MJ/kg 52 x 10³ BTU/lb

Embodied Water

100 L/kg 12 gal/lb

Common Calculations

PREN (Pitting Resistance)

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

25 to 75 points

Strength to Weight: Bending

22 to 46 points

Thermal Diffusivity

8.3 mm²/s

Thermal Shock Resistance

21 to 62 points

Alloy Composition

Iron (Fe)Fe		83.2 to 85.9
Molybdenum (Mo)Mo		7.8 to 8.5
Chromium (Cr)Cr		3.8 to 4.5
Vanadium (V)V		1.8 to 2.2
Carbon (C)C		0.5 to 0.65
Silicon (Si)Si		0.2 to 0.45
Manganese (Mn)Mn		0.15 to 0.4
Phosphorus (P)P		0 to 0.030
Sulfur (S)S		0 to 0.030