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SAE-AISI 4140 Steel vs. N08535 Stainless Steel

Both SAE-AISI 4140 steel and N08535 stainless steel are iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. 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 4140 steel and the bottom bar is N08535 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 26
46
Fatigue Strength, MPa 360 to 650
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
80
Shear Strength, MPa 410 to 660
400
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
570
Tensile Strength: Yield (Proof), MPa 590 to 990
240

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 420
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 43
13
Thermal Expansion, µm/m-K 13
16

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 2.4
36
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.5
6.3
Embodied Energy, MJ/kg 20
87
Embodied Water, L/kg 51
230

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
210
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 38
20
Strength to Weight: Bending, points 22 to 30
19
Thermal Diffusivity, mm2/s 12
3.3
Thermal Shock Resistance, points 20 to 32
13

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.8 to 1.1
24 to 27
Copper (Cu), % 0
0 to 1.5
Iron (Fe), % 96.8 to 97.8
29.4 to 44.5
Manganese (Mn), % 0.75 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
2.5 to 4.0
Nickel (Ni), % 0
29 to 36.5
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.030