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SAE-AISI T6 Steel vs. S21900 Stainless Steel

Both SAE-AISI T6 steel and S21900 stainless steel are iron alloys. They have 65% 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 T6 steel and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
78
Tensile Strength: Ultimate (UTS), MPa 880 to 2150
710

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1830
1400
Melting Onset (Solidus), °C 1770
1350
Specific Heat Capacity, J/kg-K 400
480
Thermal Conductivity, W/m-K 18
14
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 70
15
Density, g/cm3 9.5
7.7
Embodied Carbon, kg CO2/kg material 11
3.0
Embodied Energy, MJ/kg 170
43
Embodied Water, L/kg 160
160

Common Calculations

PREN (Pitting Resistance) 39
25
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 26 to 63
26
Strength to Weight: Bending, points 21 to 39
23
Thermal Diffusivity, mm2/s 4.7
3.8
Thermal Shock Resistance, points 26 to 64
15

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.080
Chromium (Cr), % 4.0 to 4.8
19 to 21.5
Cobalt (Co), % 11 to 13
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 55.9 to 63.5
59.4 to 67.4
Manganese (Mn), % 0.2 to 0.4
8.0 to 10
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0 to 0.3
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 18.5 to 21
0
Vanadium (V), % 1.5 to 2.1
0