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SAE-AISI M2 Steel vs. AISI 439 Stainless Steel

Both SAE-AISI M2 steel and AISI 439 stainless steel are iron alloys. They have 85% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (14, 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 439 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
490

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1610
1510
Melting Onset (Solidus), °C 1570
1430
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 22
25
Thermal Expansion, µm/m-K 10
11

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
2.3
Embodied Energy, MJ/kg 130
34
Embodied Water, L/kg 98
120

Common Calculations

PREN (Pitting Resistance) 31
18
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 25 to 71
18
Strength to Weight: Bending, points 22 to 44
18
Thermal Diffusivity, mm2/s 5.9
6.7
Thermal Shock Resistance, points 27 to 76
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0.78 to 1.1
0 to 0.030
Chromium (Cr), % 3.8 to 4.5
17 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78.5 to 83.4
77.1 to 82.8
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
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
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
Titanium (Ti), % 0
0.2 to 1.1
Tungsten (W), % 5.5 to 6.8
0
Vanadium (V), % 1.8 to 2.2
0