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SAE-AISI D5 Steel vs. S21800 Stainless Steel

Both SAE-AISI D5 steel and S21800 stainless steel are iron alloys. They have 75% 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 D5 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 5.4 to 14
40
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
75
Shear Strength, MPa 470 to 1180
510
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
740

Thermal Properties

Latent Heat of Fusion, J/g 270
340
Melting Completion (Liquidus), °C 1430
1360
Melting Onset (Solidus), °C 1390
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 13
15
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 3.5
3.1
Embodied Energy, MJ/kg 51
45
Embodied Water, L/kg 120
150

Common Calculations

PREN (Pitting Resistance) 15
19
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 28 to 73
27
Strength to Weight: Bending, points 24 to 46
24
Thermal Shock Resistance, points 26 to 67
17

Alloy Composition

Carbon (C), % 1.4 to 1.6
0 to 0.1
Chromium (Cr), % 11 to 13
16 to 18
Cobalt (Co), % 2.5 to 3.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 77.9 to 84.4
59.1 to 65.4
Manganese (Mn), % 0 to 0.6
7.0 to 9.0
Molybdenum (Mo), % 0.7 to 1.2
0
Nickel (Ni), % 0 to 0.3
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0 to 0.6
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0 to 1.0
0