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S40920 Stainless Steel vs. SAE-AISI 4140 Steel

Both S40920 stainless steel and SAE-AISI 4140 steel are iron alloys. They have 89% 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 S40920 stainless steel and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
200 to 310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22
11 to 26
Fatigue Strength, MPa 130
360 to 650
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 270
410 to 660
Tensile Strength: Ultimate (UTS), MPa 430
690 to 1080
Tensile Strength: Yield (Proof), MPa 190
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 710
420
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 26
43
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
2.4
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 28
20
Embodied Water, L/kg 94
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 97
920 to 2590
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 15
25 to 38
Strength to Weight: Bending, points 16
22 to 30
Thermal Diffusivity, mm2/s 6.9
12
Thermal Shock Resistance, points 15
20 to 32

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 10.5 to 11.7
0.8 to 1.1
Iron (Fe), % 85.1 to 89.4
96.8 to 97.8
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0 to 0.5
0
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040
Titanium (Ti), % 0.15 to 0.5
0