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S31277 Stainless Steel vs. SAE-AISI S7 Steel

Both S31277 stainless steel and SAE-AISI S7 steel are iron alloys. They have 47% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (12, 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 S7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
74
Tensile Strength: Ultimate (UTS), MPa 860
670 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 460
470
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 36
5.0
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.7
2.3
Embodied Energy, MJ/kg 90
31
Embodied Water, L/kg 220
65

Common Calculations

PREN (Pitting Resistance) 51
8.4
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
24 to 72
Strength to Weight: Bending, points 25
22 to 46
Thermal Shock Resistance, points 19
22 to 66

Alloy Composition

Carbon (C), % 0 to 0.020
0.45 to 0.55
Chromium (Cr), % 20.5 to 23
3.0 to 3.5
Copper (Cu), % 0.5 to 1.5
0 to 0.25
Iron (Fe), % 35.5 to 46.2
91.6 to 94.9
Manganese (Mn), % 0 to 3.0
0.2 to 0.9
Molybdenum (Mo), % 6.5 to 8.0
1.3 to 1.8
Nickel (Ni), % 26 to 28
0
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 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Vanadium (V), % 0
0 to 0.3