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SAE-AISI D3 Steel vs. S81921 Stainless Steel

Both SAE-AISI D3 steel and S81921 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI D3 steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 9.8 to 15
29
Fatigue Strength, MPa 310 to 940
370
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 74
79
Shear Strength, MPa 470 to 1220
460
Tensile Strength: Ultimate (UTS), MPa 770 to 2050
710
Tensile Strength: Yield (Proof), MPa 480 to 1550
500

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1390
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 31
15
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 8.0
14
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.2
2.9
Embodied Energy, MJ/kg 48
41
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 13
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 97 to 180
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 74
25
Strength to Weight: Bending, points 24 to 47
23
Thermal Diffusivity, mm2/s 8.3
4.0
Thermal Shock Resistance, points 23 to 63
20

Alloy Composition

Carbon (C), % 2.0 to 2.4
0 to 0.030
Chromium (Cr), % 11 to 13.5
19 to 22
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 80.3 to 87
66.7 to 75.9
Manganese (Mn), % 0 to 0.6
2.0 to 4.0
Molybdenum (Mo), % 0
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
Tungsten (W), % 0 to 1.0
0
Vanadium (V), % 0 to 1.0
0