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SAE-AISI M7 Steel vs. SAE-AISI A2 Steel

Both SAE-AISI M7 steel and SAE-AISI A2 steel are iron alloys. They have 89% 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 M7 steel and the bottom bar is SAE-AISI A2 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 77
74
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
710 to 2040

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1560
1450
Melting Onset (Solidus), °C 1510
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 28
38
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 18
5.5
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.9
2.7
Embodied Energy, MJ/kg 130
38
Embodied Water, L/kg 100
73

Common Calculations

PREN (Pitting Resistance) 35
8.9
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
25 to 73
Strength to Weight: Bending, points 23 to 47
23 to 46
Thermal Diffusivity, mm2/s 7.8
10
Thermal Shock Resistance, points 24 to 69
25 to 71

Alloy Composition

Carbon (C), % 1.0 to 1.1
1.0 to 1.1
Chromium (Cr), % 3.5 to 4.0
4.8 to 5.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 79.8 to 83.8
89.4 to 93.3
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 8.2 to 9.2
0.9 to 1.4
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 0.55
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0.15 to 0.5

Comparable Variants