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SAE-AISI O2 Steel vs. ASTM A372 Grade M Steel

Both SAE-AISI O2 steel and ASTM A372 grade M steel are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O2 steel and the bottom bar is ASTM A372 grade M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
810 to 910

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 43
46
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
2.0
Embodied Energy, MJ/kg 26
27
Embodied Water, L/kg 50
61

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 73
29 to 32
Strength to Weight: Bending, points 21 to 46
24 to 27
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 22 to 70
24 to 27

Alloy Composition

Carbon (C), % 0.85 to 1.0
0 to 0.23
Chromium (Cr), % 0 to 0.5
1.5 to 2.0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95 to 97.8
92.5 to 95.1
Manganese (Mn), % 1.4 to 1.8
0.2 to 0.4
Molybdenum (Mo), % 0 to 0.3
0.4 to 0.6
Nickel (Ni), % 0 to 0.3
2.8 to 3.9
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 0.3
Sulfur (S), % 0 to 0.030
0 to 0.010
Vanadium (V), % 0 to 0.3
0 to 0.080

Comparable Variants