Chromium 33 vs. SAE-AISI 4320 Steel

Chromium 33 belongs to the otherwise unclassified metals classification, while SAE-AISI 4320 steel belongs to the iron alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 chromium 33 and the bottom bar is SAE-AISI 4320 steel.

Chromium Alloy 33 (R20033)SAE-AISI 4320 (SNCM420, G43200) Ni-Cr-Mo Steel

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		45
Elongation at Break, %		21 to 29

Poisson's Ratio		0.27
Poisson's Ratio		0.29

Shear Modulus, GPa		81
Shear Modulus, GPa		73

Tensile Strength: Ultimate (UTS), MPa		850
Tensile Strength: Ultimate (UTS), MPa		570 to 790

Tensile Strength: Yield (Proof), MPa		430
Tensile Strength: Yield (Proof), MPa		430 to 460

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		250

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		11

Otherwise Unclassified Properties

Base Metal Price, % relative		36
Base Metal Price, % relative		3.4

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

Embodied Carbon, kg CO₂/kg material		6.0
Embodied Carbon, kg CO₂/kg material		1.7

Embodied Energy, MJ/kg		84
Embodied Energy, MJ/kg		22

Embodied Water, L/kg		250
Embodied Water, L/kg		52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		320
Resilience: Ultimate (Unit Rupture Work), MJ/m³		140 to 150

Resilience: Unit (Modulus of Resilience), kJ/m³		450
Resilience: Unit (Modulus of Resilience), kJ/m³		480 to 560

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		13

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

Strength to Weight: Axial, points		30
Strength to Weight: Axial, points		20 to 28

Strength to Weight: Bending, points		25
Strength to Weight: Bending, points		19 to 24

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		19 to 27

Alloy Composition

Carbon (C), %		0 to 0.015
Carbon (C), %		0.17 to 0.22

Chromium (Cr), %		31 to 35
Chromium (Cr), %		0.4 to 0.6

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

Iron (Fe), %		25.7 to 37.9
Iron (Fe), %		95.8 to 97

Manganese (Mn), %		0 to 2.0
Manganese (Mn), %		0.45 to 0.65

Molybdenum (Mo), %		0.5 to 2.0
Molybdenum (Mo), %		0.2 to 0.3

Nickel (Ni), %		30 to 33
Nickel (Ni), %		1.7 to 2.0

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

Phosphorus (P), %		0 to 0.020
Phosphorus (P), %		0 to 0.035

Silicon (Si), %		0 to 0.5
Silicon (Si), %		0.15 to 0.35

Sulfur (S), %		0 to 0.010
Sulfur (S), %		0 to 0.040