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ACI-ASTM CK20 Steel vs. Type 4 Magnetic Alloy

ACI-ASTM CK20 steel belongs to the iron alloys classification, while Type 4 magnetic alloy belongs to the nickel alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 ACI-ASTM CK20 steel and the bottom bar is Type 4 magnetic alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 37
2.0 to 40
Fatigue Strength, MPa 220
220 to 400
Poisson's Ratio 0.28
0.31
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 530
620 to 1100
Tensile Strength: Yield (Proof), MPa 260
270 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Mechanical, °C 1100
900
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1430
1370
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 25
60
Density, g/cm3 7.8
8.8
Embodied Carbon, kg CO2/kg material 4.4
10
Embodied Energy, MJ/kg 62
140
Embodied Water, L/kg 190
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
22 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 170
190 to 2840
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 19
19 to 35
Strength to Weight: Bending, points 19
18 to 27
Thermal Shock Resistance, points 13
21 to 37

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.050
Chromium (Cr), % 23 to 27
0 to 0.3
Cobalt (Co), % 0
0 to 0.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 46.7 to 58
9.5 to 17.5
Manganese (Mn), % 0 to 2.0
0 to 0.8
Molybdenum (Mo), % 0 to 0.5
3.5 to 6.0
Nickel (Ni), % 19 to 22
79 to 82
Phosphorus (P), % 0 to 0.040
0 to 0.010
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.020