DEVELOPMENT AND FACTORY TESTING OF A TECHNOLOGY TO MAKE WIDE PLATES FOR 1420-MM-DIAM. TUBES ON A 5000 MILL

摘要

The company Gazprom needs straight-welded pipes 1420 mm in diameter to build gas pipelines. However, such pipes are not made in Russia, and neither is skelp of the corresponding size - up to 4600 mm in width. Thus far, Russian metallurgists have succeeded in making spiral-welded pipes with a diameter of 1420 mm and a wail thickness of 15.7-18.7 mm. These pipes - which meet all of Gazprom's requirements - are made on the 2520 mill at the Volzhsk Pipe Plant from skelp with a length of 24 m. The skelp needed to make the pipes is obtained from factories in Ukraine, and their output is limited to 200,000 tons of skelp with a maximum length of 12 m. Severstal' is rebuilding plate shop No.3 and upgrading the 5000 mill, the goal being to have modem facilities for making electric-welded pipes that will have a diameter up to 1420 mm and a wall thickness up to 40 mm and will also satisfy all present and prospective Gazprom requirements. To be able to do this within the context of its general plan of reconstruction, Severstal' is working with TsNIIcheret on several research projects.