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AISI 418 Stainless Steel vs. SAE-AISI 1084 Steel

Both AISI 418 stainless steel and SAE-AISI 1084 steel are iron alloys. They have 82% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, 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 1084 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
220 to 270
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
11
Fatigue Strength, MPa 520
320 to 370
Poisson's Ratio 0.28
0.29
Reduction in Area, % 50
28 to 45
Shear Modulus, GPa 77
72
Shear Strength, MPa 680
470 to 550
Tensile Strength: Ultimate (UTS), MPa 1100
780 to 930
Tensile Strength: Yield (Proof), MPa 850
510 to 600

Thermal Properties

Latent Heat of Fusion, J/g 270
240
Maximum Temperature: Mechanical, °C 770
400
Melting Completion (Liquidus), °C 1500
1450
Melting Onset (Solidus), °C 1460
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 25
51
Thermal Expansion, µm/m-K 10
12

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
1.8
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
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
81 to 89
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
700 to 960
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 38
28 to 33
Strength to Weight: Bending, points 29
24 to 27
Thermal Diffusivity, mm2/s 6.7
14
Thermal Shock Resistance, points 40
25 to 30

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.8 to 0.93
Chromium (Cr), % 12 to 14
0
Iron (Fe), % 78.5 to 83.6
98.1 to 98.6
Manganese (Mn), % 0 to 0.5
0.6 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 0.040
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.030
0 to 0.050
Tungsten (W), % 2.5 to 3.5
0