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AISI 431 Stainless Steel vs. SAE-AISI M3 Class 2 Steel

Both AISI 431 stainless steel and SAE-AISI M3 class 2 steel are iron alloys. They have 84% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is AISI 431 stainless steel and the bottom bar is SAE-AISI M3 class 2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
770 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1510
1620
Melting Onset (Solidus), °C 1450
1570
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 26
26
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
25
Density, g/cm3 7.7
8.3
Embodied Carbon, kg CO2/kg material 2.2
12
Embodied Energy, MJ/kg 31
180
Embodied Water, L/kg 120
110

Common Calculations

PREN (Pitting Resistance) 16
33
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 32 to 50
26 to 74
Strength to Weight: Bending, points 27 to 36
22 to 45
Thermal Diffusivity, mm2/s 7.0
7.2
Thermal Shock Resistance, points 28 to 43
24 to 69

Alloy Composition

Carbon (C), % 0 to 0.2
1.2 to 1.3
Chromium (Cr), % 15 to 17
3.8 to 4.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 78.2 to 83.8
75.8 to 82.3
Manganese (Mn), % 0 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 0
4.8 to 6.5
Nickel (Ni), % 1.3 to 2.5
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
5.0 to 6.8
Vanadium (V), % 0
2.8 to 3.8

Comparable Variants