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AISI 309S Stainless Steel vs. SAE-AISI O7 Steel

Both AISI 309S stainless steel and SAE-AISI O7 steel are iron alloys. They have 64% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is AISI 309S stainless steel and the bottom bar is SAE-AISI O7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 580
680 to 2110

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1420
1480
Melting Onset (Solidus), °C 1370
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
41
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 19
6.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.6
2.3
Embodied Energy, MJ/kg 51
33
Embodied Water, L/kg 170
52

Common Calculations

PREN (Pitting Resistance) 23
3.6
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
24 to 74
Strength to Weight: Bending, points 20
22 to 46
Thermal Diffusivity, mm2/s 4.0
11
Thermal Shock Resistance, points 13
23 to 70

Alloy Composition

Carbon (C), % 0 to 0.080
1.1 to 1.3
Chromium (Cr), % 22 to 24
0.35 to 0.85
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 58.1 to 66
92.9 to 97.6
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.3
Nickel (Ni), % 12 to 15
0 to 0.3
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 0.75
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