National University of Science and Technology MISIS, Moscow, Russia

I. V. Smarygina, Cand. Eng., Associate Prof., Dept. of Metal Forming, e-mail: smarygina.iv@misis.ru
A. S. Aleshchenko, Cand. Eng., Associate Prof., Head of the Dept. of Metal Forming, e-mail: aleschenko.as@misis.ru

L. M. Kaputkina, Dr. Phys.-Math., Prof., e-mail: kaputkina@mail.ru

Trading House “Siberian Industrial Group”, Moscow, Russia

A. E. Antoshchenkov, Cand. Eng., Technical Director, e-mail: a.antoshchenkov@td-spg.ru

The temperature intervals of phase transformations and critical points of steels 09G2S, 20A, 36HG2S and DB at different heating and cooling rates have been clarified using dilatometric analysis. In order to achieve the specified characteristics of the pipe steels, schemes and heat treatment modes were proposed and tested in laboratory conditions, including using physical modeling of pipe reduction technology with subsequent heat treatment. The microstructure and mechanical properties of steels after heat treatment have been studied. Based on the research results, recommendations are given on the schemes and parameters of heat treatment and thermomechanical treatment of pipe products made of 09G2S, 20A and 36HG2S steels for use in real conditions in the production of seamless pipes using rolling or separate heating. It is shown that for steel 09G2S, the level of properties of pipes of strength classes K48, K50, K52 in a cold-resistant design can be realized with thermal improvement (quenching and high-temperature tempering) from separate or rolling heating, as well as with interrupted accelerated cooling from the end of rolling temperature with the formation of a fine-grained structure of ferrite and troostitesorbite. For steel 20A, in order to achieve the characteristics of strength classes K48, K50, K52, thermal improvement or interrupted cooling from the temperature of the end of rolling to obtain a fine-grained structure of ferrite and sorbite can also be recommended. The optimal heat treatment for the formation of strength properties for class N80 on steel 36HG2C is thermal improvement.

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