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AISI 418 Stainless Steel vs. Grade FDSiCr Steel

Both AISI 418 stainless steel and grade FDSiCr steel are iron alloys. They have 82% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AISI 418 stainless steel and the bottom bar is grade FDSiCr steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
580
Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Reduction in Area, % 50
42
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 1100
1930

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 770
410
Melting Completion (Liquidus), °C 1500
1440
Melting Onset (Solidus), °C 1460
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 25
48
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.2
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 2.9
1.5
Embodied Energy, MJ/kg 41
20
Embodied Water, L/kg 110
48

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
69
Strength to Weight: Bending, points 29
44
Thermal Diffusivity, mm2/s 6.7
13
Thermal Shock Resistance, points 40
58

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.5 to 0.6
Chromium (Cr), % 12 to 14
0.5 to 0.8
Copper (Cu), % 0
0 to 0.12
Iron (Fe), % 78.5 to 83.6
96.5 to 97.8
Manganese (Mn), % 0 to 0.5
0.5 to 0.9
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 0.5
1.2 to 1.6
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 2.5 to 3.5
0