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AISI 418 Stainless Steel vs. EN 1.7321 Steel

Both AISI 418 stainless steel and EN 1.7321 steel are iron alloys. They have 82% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is AISI 418 stainless steel and the bottom bar is EN 1.7321 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
150 to 170
Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 1100
490 to 1460

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
45
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.5
Density, g/cm3 8.0
7.9
Embodied Carbon, kg CO2/kg material 2.9
1.5
Embodied Energy, MJ/kg 41
20
Embodied Water, L/kg 110
50

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 38
17 to 52
Strength to Weight: Bending, points 29
18 to 36
Thermal Diffusivity, mm2/s 6.7
12
Thermal Shock Resistance, points 40
14 to 43

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.17 to 0.23
Chromium (Cr), % 12 to 14
0.3 to 0.6
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 78.5 to 83.6
97.1 to 98.4
Manganese (Mn), % 0 to 0.5
0.7 to 1.0
Molybdenum (Mo), % 0 to 0.5
0.4 to 0.5
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.3
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 2.5 to 3.5
0