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AISI 418 Stainless Steel vs. Grade TDC Steel

Both AISI 418 stainless steel and grade TDC 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 TDC steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
510
Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Reduction in Area, % 50
50
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 1100
1700

Thermal Properties

Latent Heat of Fusion, J/g 270
250
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
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

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 38
60
Strength to Weight: Bending, points 29
40
Thermal Diffusivity, mm2/s 6.7
14
Thermal Shock Resistance, points 40
50

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.6 to 0.75
Chromium (Cr), % 12 to 14
0 to 0.3
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 78.5 to 83.6
98 to 99.4
Manganese (Mn), % 0 to 0.5
0.5 to 1.2
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.5
0.1 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 2.5 to 3.5
0