ASTM Grade HP Steel vs. SAE-AISI H12 Steel

Both ASTM grade HP steel and SAE-AISI H12 steel are iron alloys. They have 43% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HP steel and the bottom bar is SAE-AISI H12 steel.

ASTM Grade HP (26Cr-35Ni, N08705) Cast Stainless Steel SAE-AISI H12 (T20812) Chromium Hot-Work Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		200
Elastic (Young's, Tensile) Modulus, GPa		190

Poisson's Ratio		0.28
Poisson's Ratio		0.29

Shear Modulus, GPa		78
Shear Modulus, GPa		75

Tensile Strength: Ultimate (UTS), MPa		490
Tensile Strength: Ultimate (UTS), MPa		690 to 1850

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		270

Melting Completion (Liquidus), °C		1370
Melting Completion (Liquidus), °C		1480

Melting Onset (Solidus), °C		1330
Melting Onset (Solidus), °C		1440

Specific Heat Capacity, J/kg-K		480
Specific Heat Capacity, J/kg-K		470

Thermal Conductivity, W/m-K		12
Thermal Conductivity, W/m-K		36

Thermal Expansion, µm/m-K		16
Thermal Expansion, µm/m-K		12

Otherwise Unclassified Properties

Base Metal Price, % relative		34
Base Metal Price, % relative		9.0

Density, g/cm³		7.9
Density, g/cm³		7.9

Embodied Carbon, kg CO₂/kg material		5.8
Embodied Carbon, kg CO₂/kg material		2.9

Embodied Energy, MJ/kg		82
Embodied Energy, MJ/kg		41

Embodied Water, L/kg		220
Embodied Water, L/kg		76

Common Calculations

PREN (Pitting Resistance)		27
PREN (Pitting Resistance)		12

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		17
Strength to Weight: Axial, points		24 to 65

Strength to Weight: Bending, points		17
Strength to Weight: Bending, points		22 to 42

Thermal Diffusivity, mm²/s		3.2
Thermal Diffusivity, mm²/s		9.8

Thermal Shock Resistance, points		11
Thermal Shock Resistance, points		22 to 60

Alloy Composition

Carbon (C), %		0.35 to 0.75
Carbon (C), %		0.3 to 0.4

Chromium (Cr), %		24 to 28
Chromium (Cr), %		4.8 to 5.5

Copper (Cu), %		0
Copper (Cu), %		0 to 0.25

Iron (Fe), %		29.2 to 42.7
Iron (Fe), %		87.8 to 91.7

Manganese (Mn), %		0 to 2.0
Manganese (Mn), %		0.2 to 0.5

Molybdenum (Mo), %		0 to 0.5
Molybdenum (Mo), %		1.3 to 1.8

Nickel (Ni), %		33 to 37
Nickel (Ni), %		0 to 0.3

Phosphorus (P), %		0 to 0.040
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0 to 2.5
Silicon (Si), %		0.8 to 1.2

Sulfur (S), %		0 to 0.040
Sulfur (S), %		0 to 0.030

Tungsten (W), %		0
Tungsten (W), %		1.0 to 1.7

Vanadium (V), %		0
Vanadium (V), %		0 to 0.5