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S31730 Stainless Steel vs. SAE-AISI 50B50 Steel

Both S31730 stainless steel and SAE-AISI 50B50 steel are iron alloys. Both are furnished in the annealed condition. They have 58% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S31730 stainless steel and the bottom bar is SAE-AISI 50B50 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
22
Fatigue Strength, MPa 170
260
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 370
370
Tensile Strength: Ultimate (UTS), MPa 540
590
Tensile Strength: Yield (Proof), MPa 200
370

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 990
410
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1390
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 24
2.0
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 4.6
1.4
Embodied Energy, MJ/kg 63
19
Embodied Water, L/kg 180
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 99
370
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
21
Strength to Weight: Bending, points 18
20
Thermal Shock Resistance, points 12
17

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0 to 0.030
0.48 to 0.53
Chromium (Cr), % 17 to 19
0.4 to 0.6
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 52.4 to 61
97.4 to 98.2
Manganese (Mn), % 0 to 2.0
0.75 to 1.0
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 15 to 16.5
0
Nitrogen (N), % 0 to 0.045
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 0.010
0 to 0.040