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N. M. Shkatulyak, E. A. Dragomeretskaya, V. V. Usov,  M. D. Rabkina, A. L. Palienko

TEXTURE AND COERCIVE FORCE OF THE METAL OF FURNACE TUBE COILS

The crystallographic texture of the metal of tubular samples carved from furnace coils, involved in the processing of oil after various periods of operation, was studied by X-ray diffraction by means of constructing inverse pole figures. The texture of the 15Kh5M ferritic chromium-molybdenum steel and the 08Kh18N10T austenitic chromium-nickel steel was studied in the normal direction (ND) to the surface of the tubes, in the rolling direction (RD) coinciding with the tube axis and in the transverse direction (TD) coinciding with the tangential (circumferential) direction of the tubes. The coercive force was measured in the axial and circumferential directions. The coercive force in RD exceeds its value in TD. This difference is due to crystal magnetic anisotropy caused by the crystallographic texture. Although the X-ray phase analysis of the tubular samples of the furnace coils made of the 08Kh18N10T stainless steel has not revealed the presence of the ferromagnetic phase, there is anisotropy of the coercive force. Possible reasons for the phenomenon are discussed.

Keywords: furnace coil, crystallographic texture, coercive force, crystal magnetic anisotropy

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Founder:  Institute of Engineering Science, Russian Academy of Sciences (Ural Branch)
Chief Editor:  S.V. Smirnov
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