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AISI 418 Stainless Steel vs. SAE-AISI 50B46 Steel

Both AISI 418 stainless steel and SAE-AISI 50B46 steel are iron alloys. They have 82% 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 AISI 418 stainless steel and the bottom bar is SAE-AISI 50B46 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
160
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
21
Fatigue Strength, MPa 520
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 680
340
Tensile Strength: Ultimate (UTS), MPa 1100
540
Tensile Strength: Yield (Proof), MPa 850
310

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 770
410
Melting Completion (Liquidus), °C 1500
1460
Melting Onset (Solidus), °C 1460
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 25
47
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 15
1.9
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.9
1.4
Embodied Energy, MJ/kg 41
19
Embodied Water, L/kg 110
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
99
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
260
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 38
19
Strength to Weight: Bending, points 29
19
Thermal Diffusivity, mm2/s 6.7
13
Thermal Shock Resistance, points 40
16

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.15 to 0.2
0.44 to 0.49
Chromium (Cr), % 12 to 14
0.2 to 0.35
Iron (Fe), % 78.5 to 83.6
97.7 to 98.5
Manganese (Mn), % 0 to 0.5
0.75 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 2.5 to 3.5
0