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Annealed SAE-AISI A7 vs. Annealed SAE-AISI M2

Both annealed SAE-AISI A7 and annealed SAE-AISI M2 are iron alloys. Both are furnished in the annealed condition. They have a moderately high 91% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI A7 and the bottom bar is annealed SAE-AISI M2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
77
Tensile Strength: Ultimate (UTS), MPa 800
760

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1470
1610
Melting Onset (Solidus), °C 1430
1570
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 37
22
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 10
24
Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 13
8.8
Embodied Energy, MJ/kg 200
130
Embodied Water, L/kg 100
98

Common Calculations

PREN (Pitting Resistance) 11
31
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 29
25
Strength to Weight: Bending, points 25
22
Thermal Diffusivity, mm2/s 10
5.9
Thermal Shock Resistance, points 27
27

Alloy Composition

Carbon (C), % 2.0 to 2.9
0.78 to 1.1
Chromium (Cr), % 5.0 to 5.8
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 81.4 to 87.7
78.5 to 83.4
Manganese (Mn), % 0 to 0.8
0.15 to 0.4
Molybdenum (Mo), % 0.9 to 1.4
4.5 to 5.5
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.5
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0.5 to 1.5
5.5 to 6.8
Vanadium (V), % 3.9 to 5.2
1.8 to 2.2