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S21800 Stainless Steel vs. SAE-AISI O7 Steel

Both S21800 stainless steel and SAE-AISI O7 steel are iron alloys. They have 64% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is SAE-AISI O7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Tensile Strength: Ultimate (UTS), MPa 740
680 to 2110

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Melting Completion (Liquidus), °C 1360
1480
Melting Onset (Solidus), °C 1310
1430
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 15
6.0
Density, g/cm3 7.5
7.9
Embodied Carbon, kg CO2/kg material 3.1
2.3
Embodied Energy, MJ/kg 45
33
Embodied Water, L/kg 150
52

Common Calculations

PREN (Pitting Resistance) 19
3.6
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
24 to 74
Strength to Weight: Bending, points 24
22 to 46
Thermal Shock Resistance, points 17
23 to 70

Alloy Composition

Carbon (C), % 0 to 0.1
1.1 to 1.3
Chromium (Cr), % 16 to 18
0.35 to 0.85
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 59.1 to 65.4
92.9 to 97.6
Manganese (Mn), % 7.0 to 9.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.3
Nickel (Ni), % 8.0 to 9.0
0 to 0.3
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.030
Silicon (Si), % 3.5 to 4.5
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
1.0 to 2.0
Vanadium (V), % 0
0 to 0.4