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SAE-AISI T6 Steel vs. AISI 321 Stainless Steel

Both SAE-AISI T6 steel and AISI 321 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 (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T6 steel and the bottom bar is AISI 321 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
77
Tensile Strength: Ultimate (UTS), MPa 880 to 2150
590 to 690

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1830
1430
Melting Onset (Solidus), °C 1770
1400
Specific Heat Capacity, J/kg-K 400
480
Thermal Conductivity, W/m-K 18
16
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 70
16
Density, g/cm3 9.5
7.8
Embodied Carbon, kg CO2/kg material 11
3.2
Embodied Energy, MJ/kg 170
45
Embodied Water, L/kg 160
140

Common Calculations

PREN (Pitting Resistance) 39
19
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 26 to 63
21 to 25
Strength to Weight: Bending, points 21 to 39
20 to 22
Thermal Diffusivity, mm2/s 4.7
4.1
Thermal Shock Resistance, points 26 to 64
13 to 15

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.080
Chromium (Cr), % 4.0 to 4.8
17 to 19
Cobalt (Co), % 11 to 13
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 55.9 to 63.5
65.3 to 74
Manganese (Mn), % 0.2 to 0.4
0 to 2.0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0 to 0.3
9.0 to 12
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.4
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.7
Tungsten (W), % 18.5 to 21
0
Vanadium (V), % 1.5 to 2.1
0