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SAE-AISI 1046 Steel vs. AISI 418 Stainless Steel

Both SAE-AISI 1046 steel and AISI 418 stainless 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 SAE-AISI 1046 steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 210
330
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14 to 17
17
Fatigue Strength, MPa 240 to 390
520
Poisson's Ratio 0.29
0.28
Reduction in Area, % 39 to 50
50
Shear Modulus, GPa 72
77
Shear Strength, MPa 410 to 450
680
Tensile Strength: Ultimate (UTS), MPa 660 to 740
1100
Tensile Strength: Yield (Proof), MPa 370 to 610
850

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
770
Melting Completion (Liquidus), °C 1460
1500
Melting Onset (Solidus), °C 1420
1460
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
25
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 12
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
15
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.4
2.9
Embodied Energy, MJ/kg 18
41
Embodied Water, L/kg 46
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91 to 95
170
Resilience: Unit (Modulus of Resilience), kJ/m3 360 to 990
1830
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 26
38
Strength to Weight: Bending, points 22 to 23
29
Thermal Diffusivity, mm2/s 14
6.7
Thermal Shock Resistance, points 23 to 25
40

Alloy Composition

Carbon (C), % 0.43 to 0.5
0.15 to 0.2
Chromium (Cr), % 0
12 to 14
Iron (Fe), % 98.4 to 98.9
78.5 to 83.6
Manganese (Mn), % 0.7 to 1.0
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
1.8 to 2.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0 to 0.050
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5