Chromium 33 vs. SAE-AISI 4340 Steel

Chromium 33 belongs to the otherwise unclassified metals classification, while SAE-AISI 4340 steel belongs to the iron alloys. They have a modest 36% 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 4340 steel.

Chromium Alloy 33 (R20033)SAE-AISI 4340 (SNCM439, G43400) 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, %		12 to 22

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		690 to 1280

Tensile Strength: Yield (Proof), MPa		430
Tensile Strength: Yield (Proof), MPa		470 to 1150

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		13

Otherwise Unclassified Properties

Base Metal Price, % relative		36
Base Metal Price, % relative		3.5

Density, g/cm³		7.9
Density, g/cm³		7.8

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		53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		320
Resilience: Ultimate (Unit Rupture Work), MJ/m³		79 to 170

Resilience: Unit (Modulus of Resilience), kJ/m³		450
Resilience: Unit (Modulus of Resilience), kJ/m³		590 to 3490

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		24 to 45

Strength to Weight: Bending, points		25
Strength to Weight: Bending, points		22 to 33

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		20 to 38

Alloy Composition

Carbon (C), %		0 to 0.015
Carbon (C), %		0.38 to 0.43

Chromium (Cr), %		31 to 35
Chromium (Cr), %		0.7 to 0.9

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

Iron (Fe), %		25.7 to 37.9
Iron (Fe), %		95.1 to 96.3

Manganese (Mn), %		0 to 2.0
Manganese (Mn), %		0.6 to 0.8

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