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Type 3 Magnetic Alloy vs. S21900 Stainless Steel

Type 3 magnetic alloy belongs to the nickel alloys classification, while S21900 stainless steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is Type 3 magnetic alloy and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 43
50
Fatigue Strength, MPa 170
380
Poisson's Ratio 0.31
0.28
Shear Modulus, GPa 70
78
Shear Strength, MPa 380
510
Tensile Strength: Ultimate (UTS), MPa 550
710
Tensile Strength: Yield (Proof), MPa 210
390

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Mechanical, °C 910
980
Melting Completion (Liquidus), °C 1370
1400
Melting Onset (Solidus), °C 1320
1350
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 55
15
Density, g/cm3 8.7
7.7
Embodied Carbon, kg CO2/kg material 8.7
3.0
Embodied Energy, MJ/kg 120
43
Embodied Water, L/kg 220
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
300
Resilience: Unit (Modulus of Resilience), kJ/m3 120
380
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 18
26
Strength to Weight: Bending, points 17
23
Thermal Shock Resistance, points 18
15

Alloy Composition

Carbon (C), % 0 to 0.050
0 to 0.080
Chromium (Cr), % 2.0 to 3.0
19 to 21.5
Cobalt (Co), % 0 to 0.5
0
Copper (Cu), % 4.0 to 6.0
0
Iron (Fe), % 9.9 to 19
59.4 to 67.4
Manganese (Mn), % 0 to 1.5
8.0 to 10
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 75 to 78
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.010
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030