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S31100 Stainless Steel vs. SAE-AISI 5155 Steel

Both S31100 stainless steel and SAE-AISI 5155 steel are iron alloys. Both are furnished in the annealed condition. They have 68% 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 S31100 stainless steel and the bottom bar is SAE-AISI 5155 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 4.5
21
Fatigue Strength, MPa 330
260
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
73
Shear Strength, MPa 580
390
Tensile Strength: Ultimate (UTS), MPa 1000
620
Tensile Strength: Yield (Proof), MPa 710
380

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
49
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 16
2.1
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.4
Embodied Energy, MJ/kg 44
19
Embodied Water, L/kg 170
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 40
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1240
380
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 36
22
Strength to Weight: Bending, points 29
21
Thermal Diffusivity, mm2/s 4.2
13
Thermal Shock Resistance, points 28
20

Alloy Composition

Carbon (C), % 0 to 0.060
0.51 to 0.59
Chromium (Cr), % 25 to 27
0.7 to 0.9
Iron (Fe), % 63.6 to 69
97.2 to 97.9
Manganese (Mn), % 0 to 1.0
0.7 to 0.9
Nickel (Ni), % 6.0 to 7.0
0
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 0 to 0.25
0