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SAE-AISI O7 Steel vs. AISI 418 Stainless Steel

Both SAE-AISI O7 steel and AISI 418 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 24 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 O7 steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
1100

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1480
1500
Melting Onset (Solidus), °C 1430
1460
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 6.0
15
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 2.3
2.9
Embodied Energy, MJ/kg 33
41
Embodied Water, L/kg 52
110

Common Calculations

PREN (Pitting Resistance) 3.6
19
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 74
38
Strength to Weight: Bending, points 22 to 46
29
Thermal Diffusivity, mm2/s 11
6.7
Thermal Shock Resistance, points 23 to 70
40

Alloy Composition

Carbon (C), % 1.1 to 1.3
0.15 to 0.2
Chromium (Cr), % 0.35 to 0.85
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.9 to 97.6
78.5 to 83.6
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 0 to 0.3
0 to 0.5
Nickel (Ni), % 0 to 0.3
1.8 to 2.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.6
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 2.0
2.5 to 3.5
Vanadium (V), % 0 to 0.4
0