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SAE-AISI M2 Steel vs. AISI 420 Stainless Steel

Both SAE-AISI M2 steel and AISI 420 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 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
76
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
690 to 1720

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
27
Thermal Expansion, µm/m-K 10
10

Otherwise Unclassified Properties

Base Metal Price, % relative 24
7.5
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.8
2.0
Embodied Energy, MJ/kg 130
28
Embodied Water, L/kg 98
100

Common Calculations

PREN (Pitting Resistance) 31
14
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 25 to 71
25 to 62
Strength to Weight: Bending, points 22 to 44
22 to 41
Thermal Diffusivity, mm2/s 5.9
7.3
Thermal Shock Resistance, points 27 to 76
25 to 62

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.15 to 0.4
Chromium (Cr), % 3.8 to 4.5
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78.5 to 83.4
82.3 to 87.9
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 4.5 to 5.5
0 to 0.5
Nickel (Ni), % 0 to 0.3
0 to 0.75
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