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SAE-AISI 4340M Steel vs. Type 1 Magnetic Alloy

Both SAE-AISI 4340M steel and Type 1 magnetic alloy are iron alloys. They have 56% of their average alloy composition in common. There are 25 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 4340M steel and the bottom bar is Type 1 magnetic alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
4.0 to 38
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 72
72
Tensile Strength: Ultimate (UTS), MPa 2340
500 to 830
Tensile Strength: Yield (Proof), MPa 1240
220 to 790

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1370
Specific Heat Capacity, J/kg-K 480
460
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
3.1
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
31
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 1.9
5.6
Embodied Energy, MJ/kg 26
77
Embodied Water, L/kg 55
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
33 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
130 to 1690
Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 84
17 to 28
Strength to Weight: Bending, points 51
17 to 24
Thermal Shock Resistance, points 70
16 to 26

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.050
Chromium (Cr), % 0.7 to 1.0
0 to 0.3
Cobalt (Co), % 0
0 to 0.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 93.3 to 94.8
50.7 to 56.5
Manganese (Mn), % 0.65 to 0.9
0 to 0.8
Molybdenum (Mo), % 0.35 to 0.45
0 to 0.3
Nickel (Ni), % 1.7 to 2.0
43.5 to 46.5
Phosphorus (P), % 0 to 0.012
0 to 0.010
Silicon (Si), % 1.5 to 1.8
0 to 0.5
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0