The effect of the nonsinusoidality of a magnetization reversal regime on the specific magnetic losses in electrical steel

The effect of the deviation of a magnetization reversal regime of electrical steel specimens from a sinusoidal induction regime on the specific magnetic losses is considered.     

The effect of the anisotropy of magnetic properties of electrical steel on magnetic losses in power transformer cores

The distribution of the magnetic flux in the zone of rod contacts is investigated using the model of transformer cores. The effect of the anisotropy of magnetic characteristics of steel on magnetic losses and the transformer building factor is demonstrated. A method for estimation and forecasting of the building factor value is proposed. The investigation was performed using anisotropic electric steel of the 3408–3409 grades manufactured at OOO VIZ-STAL’.     

Stress corrosion in pipes of different diameters during the nondestructive testing of gas mains

An analysis of the results of the diagnostics of the pipe state in gas mains was performed based on the data of intrapipe magnetic nondestructive testing of gas mains in order to evaluate the danger of the detected flaws and verify the accomplishment of a regular (3–5 year) intrapipe inspection.     

Development and certification of the MAΓEOC calibration block for magnetic properties of a pipeline with local heterogeneities

Some general features of metrological supplementation for techniques and means of nondestructive testing of materials and articles are discussed. In particular, the CO MAГEOC calibration block for magnetic properties of a pipeline with local inhomogeneities that was developed and certified at CПEKTP, in cooperation with the Ural Research Institute of Metrology (ФГУП УНИИМ), is considered.     

Effect of magnetic anisotropy on the mobility of the boundaries in thin magnetic films

This paper discusses the effect of magnetic crystallographic anisotropy on the mobility of the domain walls in thin magnetic films with an easy axis in the plane of the film. It shows that the stable configuration of a domain wall is a single-vortex Bloch domain wall. Besides this, there are two metastable states of the domain wall—a Néel domain wall and a domain wall with two magnetic vortices along the normal to the plane of the film. It is also shown that the mobilities of the single-vortex and Néel domain walls and the domain wall with two vortices decrease as the anisotropy constant increases and tend to the same value. Pis’ma Zh. Tekh. Fiz. 24, 42–46 (January 26, 1998)     

Developing Techniques for Testing Magnetic Properties of Electric Steels: IV. Testing of Steel Sheets in Rolls (Review Article)

The paper considers difficulties in on-line quality tests of cold-rolled anisotropic electric steels supplied in rolls. Plausible causes of these difficulties and ways to eliminate these causes are discussed. Some existing techniques and facilities for measuring magnetic parameters of moving steel sheets [1–15] are described. All the facilities known at present (including those developed by Brockhaus and Siemens) are not suitable for one reason or another for testing quality of rolled steels supplied in rolls with good accuracy. In view of this and basing on the almost unambiguous relation between magnetic properties and crystallographic texture of steels, the paper suggests determining the crystallographic texture of moving sheets of coldrolled anisotropic electric steels by measuring maxima on curves of the normal magnetization component. An instrument for such an analysis of magnetic texture is described. First results of the use of this instrument at the cold-rolling mill of Verkh-Isetsk Steelworks are reported.     

Quality control of the insulating coating on electrical steel

The necessity to cover electrical steel ribbons with an electrical insulating coating is explained. In addition to its main function (creation of an insulating layer between plates of magnetic circuits), such coatings protect metal surfaces against corrosion and may affect magnetic properties of steel. Methods for measuring the thickness of coatings and their electric properties used in the cold-rolling department operated by OOO VIZ-Stal’ are considered.