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AISI 418 Stainless Steel vs. SAE-AISI D7 Steel

Both AISI 418 stainless steel and SAE-AISI D7 steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (12, 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 D7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 1100
800 to 2120

Thermal Properties

Latent Heat of Fusion, J/g 270
270
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
27
Thermal Expansion, µm/m-K 10
11

Otherwise Unclassified Properties

Base Metal Price, % relative 15
10
Density, g/cm3 8.0
7.6
Embodied Carbon, kg CO2/kg material 2.9
11
Embodied Energy, MJ/kg 41
180
Embodied Water, L/kg 110
130

Common Calculations

PREN (Pitting Resistance) 19
16
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
29 to 78
Strength to Weight: Bending, points 29
25 to 48
Thermal Diffusivity, mm2/s 6.7
7.4
Thermal Shock Resistance, points 40
27 to 72

Alloy Composition

Carbon (C), % 0.15 to 0.2
2.2 to 2.5
Chromium (Cr), % 12 to 14
11.5 to 13.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 78.5 to 83.6
76.6 to 81.9
Manganese (Mn), % 0 to 0.5
0 to 0.6
Molybdenum (Mo), % 0 to 0.5
0.7 to 1.2
Nickel (Ni), % 1.8 to 2.2
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 2.5 to 3.5
0
Vanadium (V), % 0
3.8 to 4.4