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SAE-AISI T2 Steel vs. S43940 Stainless Steel

Both SAE-AISI T2 steel and S43940 stainless steel are iron alloys. They have 78% 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 S43940 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
77
Tensile Strength: Ultimate (UTS), MPa 780 to 2150
490

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Melting Completion (Liquidus), °C 1820
1440
Melting Onset (Solidus), °C 1760
1400
Specific Heat Capacity, J/kg-K 410
480
Thermal Conductivity, W/m-K 19
25
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 46
12
Density, g/cm3 9.3
7.7
Embodied Carbon, kg CO2/kg material 11
2.6
Embodied Energy, MJ/kg 170
38
Embodied Water, L/kg 98
120

Common Calculations

PREN (Pitting Resistance) 36
18
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 23 to 64
18
Strength to Weight: Bending, points 20 to 40
18
Thermal Diffusivity, mm2/s 4.9
6.8
Thermal Shock Resistance, points 23 to 65
18

Alloy Composition

Carbon (C), % 0.8 to 0.9
0 to 0.030
Chromium (Cr), % 3.8 to 4.5
17.5 to 18.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 70.8 to 75.8
78.2 to 82.1
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 0.3
0
Niobium (Nb), % 0
0.3 to 0.6
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 0.015
Titanium (Ti), % 0
0.1 to 0.6
Tungsten (W), % 17.5 to 19
0
Vanadium (V), % 1.8 to 2.4
0