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SAE-AISI H19 (T20819) Chromium Hot-Work Steel

SAE-AISI H19 steel is a tool steel. H19 is the designation in both the SAE and AISI systems for this material. T20819 is the UNS number.

The properties of SAE-AISI H19 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 H19 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

190 GPa 28 x 106 psi

Poisson's Ratio


Shear Modulus

75 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

720 to 1990 MPa 100 to 290 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Melting Completion (Liquidus)

1540 °C 2800 °F

Melting Onset (Solidus)

1490 °C 2720 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

29 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

22 % relative


8.2 g/cm3 510 lb/ft3

Embodied Carbon

7.5 kg CO2/kg material

Embodied Energy

110 MJ/kg 49 x 103 BTU/lb

Embodied Water

110 L/kg 13 gal/lb

Common Calculations

PREN (Pitting Resistance)


Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

24 to 68 points

Strength to Weight: Bending

22 to 43 points

Thermal Diffusivity

7.9 mm2/s

Thermal Shock Resistance

21 to 59 points

Alloy Composition

Iron (Fe)Fe 81.4 to 85.5
Chromium (Cr)Cr 4.0 to 4.8
Cobalt (Co)Co 4.0 to 4.5
Tungsten (W)W 3.8 to 4.5
Vanadium (V)V 1.8 to 2.2
Molybdenum (Mo)Mo 0.3 to 0.55
Carbon (C)C 0.32 to 0.45
Manganese (Mn)Mn 0.2 to 0.5
Silicon (Si)Si 0.2 to 0.5
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