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SAE-AISI 8720 Steel vs. S35140 Stainless Steel

Both SAE-AISI 8720 steel and S35140 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 51% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8720 steel and the bottom bar is S35140 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 25
34
Fatigue Strength, MPa 240
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 320
460
Tensile Strength: Ultimate (UTS), MPa 500
690
Tensile Strength: Yield (Proof), MPa 330
310

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
14
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
31
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.5
5.5
Embodied Energy, MJ/kg 20
78
Embodied Water, L/kg 50
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
190
Resilience: Unit (Modulus of Resilience), kJ/m3 290
250
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
24
Strength to Weight: Bending, points 18
22
Thermal Diffusivity, mm2/s 10
3.7
Thermal Shock Resistance, points 17
16

Alloy Composition

Carbon (C), % 0.18 to 0.23
0 to 0.1
Chromium (Cr), % 0.4 to 0.6
20 to 22
Iron (Fe), % 96.8 to 98
44.1 to 52.7
Manganese (Mn), % 0.7 to 0.9
1.0 to 3.0
Molybdenum (Mo), % 0.2 to 0.3
1.0 to 2.0
Nickel (Ni), % 0.4 to 0.7
25 to 27
Niobium (Nb), % 0
0.25 to 0.75
Nitrogen (N), % 0
0.080 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030