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SAE-AISI H26 (T20826) Tungsten Hot-Work Steel

SAE-AISI H26 steel is a tool steel. H26 is the designation in both the SAE and AISI systems for this material. T20826 is the UNS number.

The properties of SAE-AISI H26 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 H26 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

210 GPa 30 x 106 psi

Poisson's Ratio

0.29

Shear Modulus

80 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

720 to 2100 MPa 110 to 310 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Melting Completion (Liquidus)

1810 °C 3290 °F

Melting Onset (Solidus)

1760 °C 3190 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

22 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

45 % relative

Density

9.3 g/cm3 580 lb/ft3

Embodied Carbon

8.1 kg CO2/kg material

Embodied Energy

120 MJ/kg 53 x 103 BTU/lb

Embodied Water

90 L/kg 11 gal/lb

Common Calculations

PREN (Pitting Resistance)

34

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

21 points

Strength to Weight: Axial

22 to 63 points

Strength to Weight: Bending

19 to 39 points

Thermal Diffusivity

5.6 mm2/s

Thermal Shock Resistance

22 to 63 points

Alloy Composition

Iron (Fe) 73.3 to 77.5
Tungsten (W) 17.3 to 19
Chromium (Cr) 3.8 to 4.5
Vanadium (V) 0.75 to 1.3
Carbon (C) 0.45 to 0.55
Manganese (Mn) 0.15 to 0.4
Silicon (Si) 0.15 to 0.4
Nickel (Ni) 0 to 0.3
Copper (Cu) 0 to 0.25
Phosphorus (P) 0 to 0.030
Sulfur (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