Composition (Nominal)
0.02 C, 0.50 Mn, 0.35 Si, 80.00 Ni, 4.20 Mo, Bal. Fe
An 80% nickel-iron-molybdenum alloy with extremely high initial and maximum permeability and minimum hysteresis loss. Has been used primarily for transformer cores, tape-wound toroids, shielding and laminations operating at very low magnetic field strengths.
Specifications: ASTM A753, MIL-N-14411B (MR) (8/19/66)
Carpenter HyMu "80" alloy meets military specification MIL-N-14411 B (MR) (8/19/66) and ASTM A-753-78 standard specification.