G. V. Shchurov, E. M. Golubchik, M. V. Chukin, Magnitogorsk Metallurgical Integrated Works, Magnitogorsk State Technical University; M.Chukin@mail.ru

It was determinated that low-alloyed steels has elevated (in comparison with S420MC steel) springing, which in conditions of single-piece profiling without back tension leads to significant twisting in ends areas that increase dimensions unstability. Therefore it was decided to switch over to increased passes quantity when forming of profile of this steels class. The following private overcast angles were adjusted: 100-200-320-450-530-600-650-67030'. Forming scheme changing allowed providing the required quality level of cold-bended sections in the field of dimensions and form. During studying adaptation model was suggested for quality factors of bended sections which included taking into account rheological properties changing of forming material. product.

1. Belyshev A. S., Golubchik E. M., Schurov G. V. et al. Bended sections production development perspectives in PC «MMF» //Steel. 2007. - №2. – p.76.
2. Golubchik E. M., Schurov G. V., Arhandeev A.V. Quality management in production of bended sections for bridge engineering in PC «MMF» //Steel. 2009. №10. –p. 46.