Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
This specification covers commonly used wrought nickel-iron soft magnetic alloys produced or supplied expressly for use in magnetic cores and other parts requiring high magnetic permeability, high electrical resistivity, low coercive field strength, and low core loss. Four specific alloy types are covered such as Alloy Type 1, 2, 3, and 4. Alloy Type 2 in thin-strip form is available two different grades. Grade 1 is semi-isotropic and is recommended for use in transformer laminations. Grade 2 is isotropic and is recommended for use inn rotating machinery laminations. These materials are capable of being produced in a wide variety of forms and conditions such as forging billet, hot-rolled plate, strip, and bar, cold-finished bars, cold-rolled sheep and strip, shaped bar and wire. The alloys shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, cobalt, copper, and iron. Dc magnetic testing shall be the only magnetic test methods used for all product forma and sizes other than thin strip and sheet measuring magnetic permeability and coercive field strength. The physical properties of annealed alloy such as electrical resistivity, saturation induction, density, Curie temperature and mean linear coefficient of expansion shall be measured. Mechanical properties of cold-rolled hard temper strip such as yiled strength, ultimated tensile strength, elongation,and hardness.
1.1 This specification covers commonly used wrought nickel-iron soft magnetic alloys produced or supplied expressly for use in magnetic cores and other parts requiring high magnetic permeability, high electrical resistivity, low coercive field strength, and low core loss.
1.2 This specification covers materials supplied by a producer or converter to the form and physical condition desired for fabrication into parts that will later be given a final heat treatment to achieve the desired magnetic characteristics. It covers materials supplied in the form of forging billet; hot-rolled plate, strip, and bar; cold-finished bar; cold-rolled and annealed sheet and strip; shaped bar and wire; and wire.
1.2.1 This specification does not cover either powder metallurgically produced or cast parts.
1.2.2 This specification lists requirements for strip products having isotropic or semi-isotropic magnetic properties but does not include requirements for anisotropic or square hysteresis loop alloys or alloys processed to yield flattened hysteresis loops by use of heat treatments in an applied magnetic field.
1.2.3 This specification does not cover alloys modified by the addition of elements such as sulfur and selenium to enhance machinability.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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