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SAE-AISI M2 Steel vs. AISI 309 Stainless Steel

Both SAE-AISI M2 steel and AISI 309 stainless steel are iron alloys. They have 67% 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 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
600 to 710

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1610
1450
Melting Onset (Solidus), °C 1570
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 22
16
Thermal Expansion, µm/m-K 10
15

Otherwise Unclassified Properties

Base Metal Price, % relative 24
19
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.8
3.6
Embodied Energy, MJ/kg 130
51
Embodied Water, L/kg 98
170

Common Calculations

PREN (Pitting Resistance) 31
23
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 25 to 71
21 to 25
Strength to Weight: Bending, points 22 to 44
20 to 23
Thermal Diffusivity, mm2/s 5.9
4.3
Thermal Shock Resistance, points 27 to 76
14 to 16

Alloy Composition

Carbon (C), % 0.78 to 1.1
0 to 0.2
Chromium (Cr), % 3.8 to 4.5
22 to 24
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78.5 to 83.4
58 to 66
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 4.5 to 5.5
0
Nickel (Ni), % 0 to 0.3
12 to 15
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.45
0 to 0.75
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