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SAE-AISI M7 Steel vs. SAE-AISI A7 Steel

Both SAE-AISI M7 steel and SAE-AISI A7 steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI M7 steel and the bottom bar is SAE-AISI A7 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
72
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1560
1470
Melting Onset (Solidus), °C 1510
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 28
37
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 18
10
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 8.9
13
Embodied Energy, MJ/kg 130
200
Embodied Water, L/kg 100
100

Common Calculations

PREN (Pitting Resistance) 35
11
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
29 to 77
Strength to Weight: Bending, points 23 to 47
25 to 48
Thermal Diffusivity, mm2/s 7.8
10
Thermal Shock Resistance, points 24 to 69
27 to 72

Alloy Composition

Carbon (C), % 1.0 to 1.1
2.0 to 2.9
Chromium (Cr), % 3.5 to 4.0
5.0 to 5.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 79.8 to 83.8
81.4 to 87.7
Manganese (Mn), % 0.15 to 0.4
0 to 0.8
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
0.5 to 1.5
Vanadium (V), % 1.8 to 2.3
3.9 to 5.2

Comparable Variants