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SAE-AISI M7 Steel vs. ASTM A387 Grade 91 Class 2

Both SAE-AISI M7 steel and ASTM A387 grade 91 class 2 are iron alloys. They have 88% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M7 steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
670

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1560
1460
Melting Onset (Solidus), °C 1510
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 28
26
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 18
7.0
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.9
2.6
Embodied Energy, MJ/kg 130
37
Embodied Water, L/kg 100
88

Common Calculations

PREN (Pitting Resistance) 35
13
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
24
Strength to Weight: Bending, points 23 to 47
22
Thermal Diffusivity, mm2/s 7.8
6.9
Thermal Shock Resistance, points 24 to 69
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 1.0 to 1.1
0.080 to 0.12
Chromium (Cr), % 3.5 to 4.0
8.0 to 9.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
87.3 to 90.3
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 8.2 to 9.2
0.85 to 1.1
Nickel (Ni), % 0 to 0.3
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0.2 to 0.55
0.2 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010