Rolling of pipe from steel grade 08Х18Н10Т on a TPA 70-270 with a two-roll mill for squashing and rolling

The development of the production of seamless pipes from stainless steel grades for power engineering companies that supply integrated solutions for nuclear and thermal energy, gas and petrochemical industries is today one of the important areas of technology development for manufacturers of pipe products. And modern economic realities and external sanctions pressure on Russia make this task a priority. The use of screw rolling mills for the production of hot-rolled pipes from stainless steel grades is today the most promising direction, in comparison with the traditional method - pressing. This technology can significantly increase productivity, improve the quality of manufactured pipes and reduce the metal consumption coefficient. The use of mills with double piercing and calibration on screw rolling mills, without the use of longitudinal rolling mills implemented on the TPA 70-270 mill, is currently insufficiently studied and used in practice, since this mill is the only one in the Russian Federation. The main disadvantage of the technology for producing stainless steel pipes is the low wear resistance of rolling tools, in particular piercing mill mandrels. The high rate of tool wear does not ensure consistency of the required quality of the products. One of the promising methods for increasing tool wear resistance is the use of lubricants. Currently, the market demand for stainless steel seamless pipes is 55 thousand tons per year, of which imports account for about 20 thousand tons. Using modern technologies and production capabilities of pipe rolling tools, as well as introducing new technical solutions into the technological operations of pipe production, it is possible to increase the wear resistance of pipe rolling tools, ensure consistently high quality of produced pipes and increase competitiveness. This paper presents the results of the pilot development of rolling pipes made of steel grade 08Х18Н10Т on the TPA 70-270 mill, where the piercing of the workpiece and the rolling of the liner are carried out on the same screw rolling mill.