R05255 Alloy vs. SAE-AISI H21 Steel

R05255 alloy belongs to the otherwise unclassified metals classification, while SAE-AISI H21 steel belongs to the iron alloys. There are 16 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 R05255 alloy and the bottom bar is SAE-AISI H21 steel.

UNS R05255 Tantalum-Tungsten Alloy SAE-AISI H21 (T20821) Tungsten Hot-Work Steel

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.34
Poisson's Ratio		0.29

Shear Modulus, GPa		70
Shear Modulus, GPa		76

Tensile Strength: Ultimate (UTS), MPa		540
Tensile Strength: Ultimate (UTS), MPa		720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		250

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		440

Thermal Conductivity, W/m-K		59
Thermal Conductivity, W/m-K		27

Thermal Expansion, µm/m-K		6.6
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Density, g/cm³		17
Density, g/cm³		8.5

Embodied Water, L/kg		630
Embodied Water, L/kg		72

Common Calculations

Stiffness to Weight: Axial, points		6.3
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		11
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		9.1
Strength to Weight: Axial, points		23 to 58

Strength to Weight: Bending, points		8.9
Strength to Weight: Bending, points		21 to 38

Thermal Diffusivity, mm²/s		25
Thermal Diffusivity, mm²/s		7.1

Thermal Shock Resistance, points		31
Thermal Shock Resistance, points		24 to 59

Alloy Composition

Carbon (C), %		0 to 0.010
Carbon (C), %		0.28 to 0.36

Chromium (Cr), %		0
Chromium (Cr), %		3.0 to 3.8

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

Hydrogen (H), %		0 to 0.0015
Hydrogen (H), %		0

Iron (Fe), %		0 to 0.010
Iron (Fe), %		87.6 to 93.8

Manganese (Mn), %		0
Manganese (Mn), %		0.15 to 0.4

Molybdenum (Mo), %		0 to 0.020
Molybdenum (Mo), %		0

Nickel (Ni), %		0 to 0.010
Nickel (Ni), %		0 to 0.3

Niobium (Nb), %		0 to 0.5
Niobium (Nb), %		0

Nitrogen (N), %		0 to 0.010
Nitrogen (N), %		0

Oxygen (O), %		0 to 0.015
Oxygen (O), %		0

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

Silicon (Si), %		0 to 0.0050
Silicon (Si), %		0.15 to 0.5

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

Tantalum (Ta), %		95.9 to 98
Tantalum (Ta), %		0

Titanium (Ti), %		0 to 0.010
Titanium (Ti), %		0

Tungsten (W), %		2.0 to 3.5
Tungsten (W), %		8.5 to 10

Vanadium (V), %		0
Vanadium (V), %		0.3 to 0.6