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SAE-AISI M4 Steel vs. SAE-AISI O2 Steel

Both SAE-AISI M4 steel and SAE-AISI O2 steel are iron alloys. They have 81% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M4 steel and the bottom bar is SAE-AISI O2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
72
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
640 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1610
1450
Melting Onset (Solidus), °C 1560
1410
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 25
43
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 25
2.4
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 14
1.8
Embodied Energy, MJ/kg 210
26
Embodied Water, L/kg 110
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
23 to 73
Strength to Weight: Bending, points 23 to 45
21 to 46
Thermal Diffusivity, mm2/s 6.9
12
Thermal Shock Resistance, points 24 to 68
22 to 70

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.85 to 1.0
Chromium (Cr), % 3.8 to 4.8
0 to 0.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 75.9 to 81.4
95 to 97.8
Manganese (Mn), % 0.15 to 0.4
1.4 to 1.8
Molybdenum (Mo), % 4.3 to 5.5
0 to 0.3
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0 to 0.3

Comparable Variants