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SAE-AISI 8740 Steel vs. N08810 Stainless Steel

Both SAE-AISI 8740 steel and N08810 stainless steel are iron alloys. They have 47% of their average alloy composition in common. There are 30 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 8740 steel and the bottom bar is N08810 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 23
33
Fatigue Strength, MPa 270 to 350
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 370 to 400
340
Tensile Strength: Ultimate (UTS), MPa 580 to 670
520
Tensile Strength: Yield (Proof), MPa 380 to 570
200

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
12
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
30
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.5
5.3
Embodied Energy, MJ/kg 20
76
Embodied Water, L/kg 50
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
140
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
100
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 24
18
Strength to Weight: Bending, points 20 to 22
18
Thermal Diffusivity, mm2/s 10
3.0
Thermal Shock Resistance, points 17 to 20
13

Alloy Composition

Aluminum (Al), % 0
0.15 to 0.6
Carbon (C), % 0.38 to 0.43
0.050 to 0.1
Chromium (Cr), % 0.4 to 0.6
19 to 23
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 96.5 to 97.7
39.5 to 50.7
Manganese (Mn), % 0.75 to 1.0
0 to 1.5
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 0.4 to 0.7
30 to 35
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.015
Titanium (Ti), % 0
0.15 to 0.6