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SAE-AISI S2 Steel vs. AISI 445 Stainless Steel

Both SAE-AISI S2 steel and AISI 445 stainless steel are iron alloys. They have 79% of their average alloy composition in common. There are 23 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 S2 steel and the bottom bar is AISI 445 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Tensile Strength: Ultimate (UTS), MPa 670 to 1940
480

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
21
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.1
2.6
Embodied Energy, MJ/kg 30
38
Embodied Water, L/kg 49
130

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 69
17
Strength to Weight: Bending, points 22 to 44
18
Thermal Diffusivity, mm2/s 12
5.6
Thermal Shock Resistance, points 23 to 68
16

Alloy Composition

Carbon (C), % 0.4 to 0.55
0 to 0.020
Chromium (Cr), % 0
19 to 21
Copper (Cu), % 0 to 0.25
0.3 to 0.6
Iron (Fe), % 96 to 98.1
74.9 to 80.7
Manganese (Mn), % 0.3 to 0.5
0 to 1.0
Molybdenum (Mo), % 0.3 to 0.6
0
Nickel (Ni), % 0 to 0.3
0 to 0.6
Niobium (Nb), % 0
0 to 0.8
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.9 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0 to 0.5
0