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SAE-AISI O7 Steel vs. SAE-AISI M7 Steel

Both SAE-AISI O7 steel and SAE-AISI M7 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 (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O7 steel and the bottom bar is SAE-AISI M7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
760 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1480
1560
Melting Onset (Solidus), °C 1430
1510
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 41
28
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 6.0
18
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 2.3
8.9
Embodied Energy, MJ/kg 33
130
Embodied Water, L/kg 52
100

Common Calculations

PREN (Pitting Resistance) 3.6
35
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 74
26 to 76
Strength to Weight: Bending, points 22 to 46
23 to 47
Thermal Diffusivity, mm2/s 11
7.8
Thermal Shock Resistance, points 23 to 70
24 to 69

Alloy Composition

Carbon (C), % 1.1 to 1.3
1.0 to 1.1
Chromium (Cr), % 0.35 to 0.85
3.5 to 4.0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 92.9 to 97.6
79.8 to 83.8
Manganese (Mn), % 0 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 0 to 0.3
8.2 to 9.2
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.6
0.2 to 0.55
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 2.0
1.4 to 2.1
Vanadium (V), % 0 to 0.4
1.8 to 2.3

Comparable Variants