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SAE-AISI T2 Steel vs. S81921 Stainless Steel

Both SAE-AISI T2 steel and S81921 stainless steel are iron alloys. They have 77% 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 T2 steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 79
79
Tensile Strength: Ultimate (UTS), MPa 780 to 2150
710

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1820
1430
Melting Onset (Solidus), °C 1760
1390
Specific Heat Capacity, J/kg-K 410
480
Thermal Conductivity, W/m-K 19
15
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 46
14
Density, g/cm3 9.3
7.7
Embodied Carbon, kg CO2/kg material 11
2.9
Embodied Energy, MJ/kg 170
41
Embodied Water, L/kg 98
150

Common Calculations

PREN (Pitting Resistance) 36
28
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 23 to 64
25
Strength to Weight: Bending, points 20 to 40
23
Thermal Diffusivity, mm2/s 4.9
4.0
Thermal Shock Resistance, points 23 to 65
20

Alloy Composition

Carbon (C), % 0.8 to 0.9
0 to 0.030
Chromium (Cr), % 3.8 to 4.5
19 to 22
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 70.8 to 75.8
66.7 to 75.9
Manganese (Mn), % 0.2 to 0.4
2.0 to 4.0
Molybdenum (Mo), % 0 to 1.0
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), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 17.5 to 19
0
Vanadium (V), % 1.8 to 2.4
0