Chromium 33 vs. SAE-AISI A8 Steel

Chromium 33 belongs to the otherwise unclassified metals classification, while SAE-AISI A8 steel belongs to the iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 17 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is chromium 33 and the bottom bar is SAE-AISI A8 steel.

Chromium Alloy 33 (R20033)SAE-AISI A8 (T30108) Air-Hardening Steel

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.27
Poisson's Ratio		0.29

Shear Modulus, GPa		81
Shear Modulus, GPa		74

Tensile Strength: Ultimate (UTS), MPa		850
Tensile Strength: Ultimate (UTS), MPa		700 to 1920

Thermal Properties

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

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

Thermal Expansion, µm/m-K		14
Thermal Expansion, µm/m-K		12

Otherwise Unclassified Properties

Base Metal Price, % relative		36
Base Metal Price, % relative		8.5

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

Embodied Carbon, kg CO₂/kg material		6.0
Embodied Carbon, kg CO₂/kg material		2.3

Embodied Energy, MJ/kg		84
Embodied Energy, MJ/kg		31

Embodied Water, L/kg		250
Embodied Water, L/kg		73

Common Calculations

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		30
Strength to Weight: Axial, points		25 to 68

Strength to Weight: Bending, points		25
Strength to Weight: Bending, points		22 to 44

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		22 to 62

Alloy Composition

Carbon (C), %		0 to 0.015
Carbon (C), %		0.5 to 0.6

Chromium (Cr), %		31 to 35
Chromium (Cr), %		4.8 to 5.5

Copper (Cu), %		0.3 to 1.2
Copper (Cu), %		0 to 0.25

Iron (Fe), %		25.7 to 37.9
Iron (Fe), %		88.5 to 91.9

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

Molybdenum (Mo), %		0.5 to 2.0
Molybdenum (Mo), %		1.2 to 1.7

Nickel (Ni), %		30 to 33
Nickel (Ni), %		0 to 0.3

Nitrogen (N), %		0.35 to 0.6
Nitrogen (N), %		0

Phosphorus (P), %		0 to 0.020
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0 to 0.5
Silicon (Si), %		0.75 to 1.1

Sulfur (S), %		0 to 0.010
Sulfur (S), %		0 to 0.030

Tungsten (W), %		0
Tungsten (W), %		1.0 to 1.5