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SAE-AISI 5120 Steel vs. S20161 Stainless Steel

Both SAE-AISI 5120 steel and S20161 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 72% 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 5120 steel and the bottom bar is S20161 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
46
Fatigue Strength, MPa 210
360
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 310
690
Tensile Strength: Ultimate (UTS), MPa 500
980
Tensile Strength: Yield (Proof), MPa 320
390

Thermal Properties

Latent Heat of Fusion, J/g 250
330
Maximum Temperature: Mechanical, °C 420
870
Melting Completion (Liquidus), °C 1460
1380
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 47
15
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
12
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 1.4
2.7
Embodied Energy, MJ/kg 19
39
Embodied Water, L/kg 49
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71
360
Resilience: Unit (Modulus of Resilience), kJ/m3 280
390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 18
36
Strength to Weight: Bending, points 18
29
Thermal Diffusivity, mm2/s 13
4.0
Thermal Shock Resistance, points 16
22

Alloy Composition

Carbon (C), % 0.17 to 0.22
0 to 0.15
Chromium (Cr), % 0.7 to 0.9
15 to 18
Iron (Fe), % 97.6 to 98.3
65.6 to 73.9
Manganese (Mn), % 0.7 to 0.9
4.0 to 6.0
Nickel (Ni), % 0
4.0 to 6.0
Nitrogen (N), % 0
0.080 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
3.0 to 4.0
Sulfur (S), % 0 to 0.040
0 to 0.040