Prethodno priopćenje

Improving production technology of tube steel grades in converter process

P. V. Kovalev ; Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan; OAO «Severstal», Saint-Petersburg, Russia
S. V. Ryaboshuk ; Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan; OAO «Severstal», Saint-Petersburg, Russia
A. Z. Issagulov ; Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan; OAO «Severstal», Saint-Petersburg, Russia
V. Yu. Kulikov ; Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan; OAO «Severstal», Saint-Petersburg, Russia
Sv. S. Kvon ; Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan; OAO «Severstal», Saint-Petersburg, Russia
Y. P. Chsherbakova ; Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan; OAO «Severstal», Saint-Petersburg, Russia
G. I. Sultamurat ; Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan; OAO «Severstal», Saint-Petersburg, Russia
M. V. Jironkin ; Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan; OAO «Severstal», Saint-Petersburg, Russia

Sažetak

Nature of formation and evolution special features of nonmetallic inclusions during ladle refining of converter HSLA steels for pipelines have been studied. Nonmetallic inclusions of the CaO-₂O₃-MgO system, close to calcium monoaluminate CaO∙Al₂O₃ with up to 5-6% of MgO, have been found as favorable from morphology point of view. These small inclusions nucleate on endogenous MgO substrates at sufficient high content of calcium in steel melt. Hot rolled plates can be rejected due to the coarse calcium bi- and hexa-aluminate inclusions (CaO∙2₂O₃ and CaO∙6₂O₃), usually containing exogenous MgO. These coarse inclusions form under calcium deficiency conditions, especially in the case of longtime steel holding in a ladle.

Ključne riječi

nonmetallic inclusions; tube steel; deoxidation; modification; strip

Hrčak ID:

157432

URI

https://hrcak.srce.hr/157432

Datum izdavanja:

1.10.2016.

Posjeta: 1.448 *