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SAE-AISI 5140 Steel vs. S40910 Stainless Steel

Both SAE-AISI 5140 steel and S40910 stainless 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 SAE-AISI 5140 steel and the bottom bar is S40910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 290
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 29
23
Fatigue Strength, MPa 220 to 570
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 360 to 600
270
Tensile Strength: Ultimate (UTS), MPa 560 to 970
430
Tensile Strength: Yield (Proof), MPa 290 to 840
190

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 420
710
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 45
26
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.0
Embodied Energy, MJ/kg 19
28
Embodied Water, L/kg 49
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 76 to 180
80
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1880
94
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 20 to 34
16
Strength to Weight: Bending, points 19 to 28
16
Thermal Diffusivity, mm2/s 12
6.9
Thermal Shock Resistance, points 16 to 29
16

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 0.9
10.5 to 11.7
Iron (Fe), % 97.3 to 98.1
85 to 89.5
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0 to 0.17
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0 to 0.5