Silicon Core Iron A

Silicon Core Iron A is a magnetic core alloy with high initial permeability, low hysteresis loss in AC and DC circuits, moderate formability, and a medium electrical resistivity, yet higher than Electrical Iron. It is melted in electric arc furnaces to exacting chemical specifications and carefully controlled in rolling and annealing processes to produce a fine-grain, uniform quality magnetic core iron. Silicon Core Iron "A-FM" contains a free-machining additive to improve its machinability especially for screw machine operations. It has been used primarily for solid cores which must be machined economically in volume.

Type Analysis

  • Carbon (Nominal) 0.03
  • Silicon (Nominal) 1
  • Manganese (Nominal) 0.15
  • Iron (Nominal) Balance


solenoid switches, armatures, pole pieces, relays

Applicable Specifications

  • ASTM A867 Type 1





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