METHOD OF MODIFICATION OF STEEL Russian patent published in 2003 - IPC

FIELD: ferrous metallurgy; modification of steel at silicon content up to 0.01%. SUBSTANCE: proposed method includes melting of metal in steel melting unit, ladling non-oxidized metal, blowing it with argon at two stages, introducing mixture of calcium, magnesium and aluminum into metal at second stage; mixture is first introduced under layer of slag to depth of 0.8-0.9 of height of metal from slag-metal interface; consumption of argon is increased in proportion to ferrostatic pressure of metal. It is good practice to introduce calcium, magnesium and aluminum at the following ratio : (0.8-1.2) : (0.8-1.2) : (7.8-8.3). EFFECT: improved mechanical properties due to smooth distribution of finely dispersed refractory non-metallic inclusions. 2 cl, 1 tbl