N50 sheet, strip
Permalloys are characterized as iron-nickel alloys that have relatively high permeability in weak fields. Belonging of every alloy to a defined group depends on extrusion rate of magnetic and electrical properties and a quantity of nickel. Marking 50N indicates a content of nickel in alloy (50%). It is hard-welded and that is why there are made a thermal processing and the last annealing for strengthening the welds. Nowadays, sheet, strip of this grade have the widest application. These are details of soft-magnetic constructions that are used in instrument engineering and energetics.
Due to its small magnetostriction, sheet, strip are used in high-accurate units that have stable characteristics in a variable magnetic field. They possess small changes of real resistance depending on force and sense of a magnetic field. Sheet, strip are used in manufacturing the transformer flakes, elements of magnetic recording heads, cores of small-sized transformers, relay actuators, chokes and details of magnetic circuits. They operate while working with minimal magnetizing at high magnitudes of induction.
Percentage composition according to GOST 10 994 — 74
||48.33 — 50.55
||0.15 — 0.3
||0.3 — 0.6
Iron-nickel alloys are smelted in an open arc furnace. Except for analogous alloys, permalloy 50N does not contain phosphorus. It possesses a small variation of electrical resistance (not more than 5%), which are defined by force and existent magnetic orientation. This alloy must be alloyed with such elements as cuprum, mangan, silicon for strengthening of electromagnetic properties. A smelt is done in a vacuum or inert gas envinronment. Semi-fabricates of minimal thickness are manufactured with a method of cold-rolled stamping with further annealing. It is done for increasing magnetic properties. Permalloy of this grade has improved features and an increased magnetizing. This alloy is characterized by a significant magnetic sensitivity in relation to external changes.
|Modulus of elasticity of first kind [MPa]
|Heating capacity of material (or coefficient of conductivity for heat) [V/(m/degree]
|Required temperature for obtaining of actual features [Degree]
|Linear expansion thermal coefficient [1/degree] (range of temperatures 20°С)
|Specific electrical resistivity [Оhm-mm2/m] 0,81
|Density of a material, [kg/m3]
|Specific heat of a material [J/(kg/degree)] (range of temperature 20°С)
|Coercive field (not higher) [A/m]
|Magnetic inductive capacity (not higher) [mH/m]
|Saturation induction 2 T [V/kg]
|Magnetic T induction, magnetic field strength no less than 100, in magnetic field, [A/m]
|Short resistance to rupture [MPa]
|Flow limit (proportional limit load) for permanent change of form [MPa]
|Percent elongation at fracture [ % ]
|Contraction ratio [ % ]
|Impact hardness [ kJ/m2]
|Brinell hardness [MPa]-1 120−210
||welding is possible at heating to 100−120°С and last heat treating|
||in order to obtain a qualitative welded joints, it is necessary to perform the following operations: while welding to heat it up to 200−300°C, heat treating (annealing) after welding|
|weldable without stint
||welding is done without further heat treating or previous heating|
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