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SAE-AISI 5140 Steel vs. AISI 308 Stainless Steel

Both SAE-AISI 5140 steel and AISI 308 stainless steel are iron alloys. They have 69% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 5140 steel and the bottom bar is AISI 308 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 290
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 29
45
Fatigue Strength, MPa 220 to 570
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 360 to 600
410
Tensile Strength: Ultimate (UTS), MPa 560 to 970
590
Tensile Strength: Yield (Proof), MPa 290 to 840
230

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 420
990
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 45
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
17
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
3.2
Embodied Energy, MJ/kg 19
46
Embodied Water, L/kg 49
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 76 to 180
210
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1880
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 20 to 34
21
Strength to Weight: Bending, points 19 to 28
20
Thermal Diffusivity, mm2/s 12
4.1
Thermal Shock Resistance, points 16 to 29
13

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.080
Chromium (Cr), % 0.7 to 0.9
19 to 21
Iron (Fe), % 97.3 to 98.1
64.1 to 71
Manganese (Mn), % 0.7 to 0.9
0 to 2.0
Nickel (Ni), % 0
10 to 12
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