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SAE-AISI D7 Steel vs. S32550 Stainless Steel

Both SAE-AISI D7 steel and S32550 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI D7 steel and the bottom bar is S32550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
860

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
16
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
20
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 11
3.8
Embodied Energy, MJ/kg 180
53
Embodied Water, L/kg 130
180

Common Calculations

PREN (Pitting Resistance) 16
40
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 78
31
Strength to Weight: Bending, points 25 to 48
26
Thermal Diffusivity, mm2/s 7.4
4.4
Thermal Shock Resistance, points 27 to 72
23

Alloy Composition

Carbon (C), % 2.2 to 2.5
0 to 0.040
Chromium (Cr), % 11.5 to 13.5
24 to 27
Copper (Cu), % 0 to 0.25
1.5 to 2.5
Iron (Fe), % 76.6 to 81.9
57.2 to 67
Manganese (Mn), % 0 to 0.6
0 to 1.5
Molybdenum (Mo), % 0.7 to 1.2
2.9 to 3.9
Nickel (Ni), % 0 to 0.3
4.5 to 6.5
Nitrogen (N), % 0
0.1 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.6
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 3.8 to 4.4
0