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SAE-AISI M2 Steel vs. AISI 431 Stainless Steel

Both SAE-AISI M2 steel and AISI 431 stainless steel are iron alloys. They have 86% 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 SAE-AISI M2 steel and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
890 to 1380

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1610
1510
Melting Onset (Solidus), °C 1570
1450
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 22
26
Thermal Expansion, µm/m-K 10
12

Otherwise Unclassified Properties

Base Metal Price, % relative 24
9.0
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.8
2.2
Embodied Energy, MJ/kg 130
31
Embodied Water, L/kg 98
120

Common Calculations

PREN (Pitting Resistance) 31
16
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 25 to 71
32 to 50
Strength to Weight: Bending, points 22 to 44
27 to 36
Thermal Diffusivity, mm2/s 5.9
7.0
Thermal Shock Resistance, points 27 to 76
28 to 43

Alloy Composition

Carbon (C), % 0.78 to 1.1
0 to 0.2
Chromium (Cr), % 3.8 to 4.5
15 to 17
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78.5 to 83.4
78.2 to 83.8
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 4.5 to 5.5
0
Nickel (Ni), % 0 to 0.3
1.3 to 2.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.5 to 6.8
0
Vanadium (V), % 1.8 to 2.2
0

Comparable Variants