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SAE-AISI A9 Steel vs. SAE-AISI M7 Steel

Both SAE-AISI A9 steel and SAE-AISI M7 steel are iron alloys. They have 90% 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 A9 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 74
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
760 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1460
1560
Melting Onset (Solidus), °C 1410
1510
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 35
28
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
18
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 4.7
8.9
Embodied Energy, MJ/kg 70
130
Embodied Water, L/kg 82
100

Common Calculations

PREN (Pitting Resistance) 10
35
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28 to 73
26 to 76
Strength to Weight: Bending, points 24 to 46
23 to 47
Thermal Diffusivity, mm2/s 9.6
7.8
Thermal Shock Resistance, points 25 to 66
24 to 69

Alloy Composition

Carbon (C), % 0.45 to 0.55
1.0 to 1.1
Chromium (Cr), % 4.8 to 5.5
3.5 to 4.0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
79.8 to 83.8
Manganese (Mn), % 0 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
8.2 to 9.2
Nickel (Ni), % 1.3 to 1.8
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 1.0 to 1.2
0.2 to 0.55
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0.8 to 1.4
1.8 to 2.3

Comparable Variants