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SAE-AISI D7 Steel vs. S81921 Stainless Steel

Both SAE-AISI D7 steel and S81921 stainless steel are iron alloys. They have 86% 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 SAE-AISI D7 steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 73
79
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
710

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
14
Density, g/cm3 7.6
7.7
Embodied Carbon, kg CO2/kg material 11
2.9
Embodied Energy, MJ/kg 180
41
Embodied Water, L/kg 130
150

Common Calculations

PREN (Pitting Resistance) 16
28
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 78
25
Strength to Weight: Bending, points 25 to 48
23
Thermal Diffusivity, mm2/s 7.4
4.0
Thermal Shock Resistance, points 27 to 72
20

Alloy Composition

Carbon (C), % 2.2 to 2.5
0 to 0.030
Chromium (Cr), % 11.5 to 13.5
19 to 22
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
66.7 to 75.9
Manganese (Mn), % 0 to 0.6
2.0 to 4.0
Molybdenum (Mo), % 0.7 to 1.2
1.0 to 2.0
Nickel (Ni), % 0 to 0.3
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
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