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SAE-AISI D7 Steel vs. S44800 Stainless Steel

Both SAE-AISI D7 steel and S44800 stainless steel are iron alloys. They have 79% 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 S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 73
82
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
590

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
17
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
19
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 11
3.8
Embodied Energy, MJ/kg 180
52
Embodied Water, L/kg 130
190

Common Calculations

PREN (Pitting Resistance) 16
42
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 78
21
Strength to Weight: Bending, points 25 to 48
20
Thermal Diffusivity, mm2/s 7.4
4.6
Thermal Shock Resistance, points 27 to 72
19

Alloy Composition

Carbon (C), % 2.2 to 2.5
0 to 0.010
Chromium (Cr), % 11.5 to 13.5
28 to 30
Copper (Cu), % 0 to 0.25
0 to 0.15
Iron (Fe), % 76.6 to 81.9
62.6 to 66.5
Manganese (Mn), % 0 to 0.6
0 to 0.3
Molybdenum (Mo), % 0.7 to 1.2
3.5 to 4.2
Nickel (Ni), % 0 to 0.3
2.0 to 2.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.6
0 to 0.2
Sulfur (S), % 0 to 0.030
0 to 0.020
Vanadium (V), % 3.8 to 4.4
0