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SAE-AISI T6 Steel vs. S21800 Stainless Steel

Both SAE-AISI T6 steel and S21800 stainless steel are iron alloys. They have 65% of their average alloy composition in common. There are 20 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 T6 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 880 to 2150
740

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Melting Completion (Liquidus), °C 1830
1360
Melting Onset (Solidus), °C 1770
1310
Specific Heat Capacity, J/kg-K 400
500
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 70
15
Density, g/cm3 9.5
7.5
Embodied Carbon, kg CO2/kg material 11
3.1
Embodied Energy, MJ/kg 170
45
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 39
19
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
26
Strength to Weight: Axial, points 26 to 63
27
Strength to Weight: Bending, points 21 to 39
24
Thermal Shock Resistance, points 26 to 64
17

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.1
Chromium (Cr), % 4.0 to 4.8
16 to 18
Cobalt (Co), % 11 to 13
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 55.9 to 63.5
59.1 to 65.4
Manganese (Mn), % 0.2 to 0.4
7.0 to 9.0
Molybdenum (Mo), % 0.4 to 1.0
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), % 0.2 to 0.4
3.5 to 4.5
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