Central Scientific and Research Institute of Ferrous Metallurgy (TsNIIchermet) named after I. P. Bardin, Moscow, Russia:

Morozov Yu. D., Cand. Eng., Director

Goli-Oglu E. A., Cand. Eng., Senior Research Fellow, Goli-Oglu@yandex.ru

Nastich S. Yu., Cand. Eng., Leading Scientific Fellow

Chelyabinsk Tube Rolling Works, Chelyabinsk, Russia:

Knyshev A. V., Head of Technological Department

The features of up-to-date technologies of manufacturing high-strength rolled products of large diameter tubes for gas pipelines are described applying to the Steckel rolling mills. Chemical composition of processed tube steels is analyzed and metal-scientific substantiation of the choice of scope of the main production facilities is presented. Austenite structure of labour samples after simulation of different rolling procedures in roughing rolling is examined for different partial reduction, as well as dispersed ferrite-bainite microstructure of rolled steel with K60 strength class. The main technical and technological advantages and deficiencies of manufacturing process of high-strength rolled tubes at these mills, including location plan, dimension range and productivity, are noted. It is shown that Steckel mill with three furnace coilers is located after the heavy plate rolling mill. Priority directions of improvement of the technology and equipment at the Steckel mill are reviewed. Combining up-to-date technologies of controlled rolling with additional improvements in alloying concept of low-carbon tube steel that are processed in Steckel mills opens new potential possibilities for manufacture of high-strength and high-tough rolled products for tube pipelines.

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