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S31277 Stainless Steel vs. SAE-AISI M7 Steel

Both S31277 stainless steel and SAE-AISI M7 steel are iron alloys. They have 53% of their average alloy composition in common. There are 20 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 S31277 stainless steel and the bottom bar is SAE-AISI M7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
77
Tensile Strength: Ultimate (UTS), MPa 860
760 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Melting Completion (Liquidus), °C 1460
1560
Melting Onset (Solidus), °C 1410
1510
Specific Heat Capacity, J/kg-K 460
450
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 36
18
Density, g/cm3 8.1
8.1
Embodied Carbon, kg CO2/kg material 6.7
8.9
Embodied Energy, MJ/kg 90
130
Embodied Water, L/kg 220
100

Common Calculations

PREN (Pitting Resistance) 51
35
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
26 to 76
Strength to Weight: Bending, points 25
23 to 47
Thermal Shock Resistance, points 19
24 to 69

Alloy Composition

Carbon (C), % 0 to 0.020
1.0 to 1.1
Chromium (Cr), % 20.5 to 23
3.5 to 4.0
Copper (Cu), % 0.5 to 1.5
0 to 0.25
Iron (Fe), % 35.5 to 46.2
79.8 to 83.8
Manganese (Mn), % 0 to 3.0
0.15 to 0.4
Molybdenum (Mo), % 6.5 to 8.0
8.2 to 9.2
Nickel (Ni), % 26 to 28
0 to 0.3
Nitrogen (N), % 0.3 to 0.4
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.5
0.2 to 0.55
Sulfur (S), % 0 to 0.010
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.8 to 2.3