Defects of traditional steel rolling process

The traditional steel rolling process is that the steel billets are stacked and cooled, transported to the rolling mill, and then heated in a heating furnace to be rolled into steel. This process has two defects:

1. Ka dib billet-ka laga soo saaro kasarka birta-samaynta joogtada ah, heerkulka sariirta qaboojinta waa 700-900 ° C, kulaylka qarsoon ee billet-ka si fiican looma isticmaalo.

2. After the continuous casting billet is heated by the heating furnace, the surface of the billet will lose about 1.5% due to oxidation.

Falanqaynta faa’iidooyinka tamarta-badbaadinta:

1. Isticmaalka dhuxusha ee foornada kuleylka asalka ah ee habka kuleylka kuleylka waa 80 kg / ton oo bir ah (qiimaha calorific 6400 kcal / kg), taas oo u dhiganta 72 kg ee dhuxusha caadiga ah; ka dib isbeddelka farsamada, habka isticmaalka tamarta waa 38 kWh halkii tan oo bir ah, taas oo u dhiganta 13.3 kg dhuxusha caadiga ah.

2. Iyadoo lagu salaynayo qiyaasta wax soo saarka birta ee sanadlaha ah ee 600,000 oo tan, kaydka sanadlaha ee dhuxusha caadiga ah waa: (72-13.3) ÷ 1000 × 600,000 tons = 35,220 tons of standard dhuxusha.

3. Mabda’a badbaadinta tamarta:

Ka dib billet-ka laga soo saaro mishiinka shubista joogtada ah, dusha sare ayaa leh heerkul ah 750-850, heerkulka gudahana xitaa wuxuu gaarayaa 950-1000 ° C. Mid ka mid ah mabaadi’da aasaasiga ah ee kuleylka kicinta ayaa ah saameynta maqaarka, taas oo ah in tamarta kulaylka si tartiib tartiib ah loogu wareejiyo gudaha kuleylka dusha sare. Xagga sare, saddex-meelood meel meel gudaha biilka looma baahna in la kululeeyo. Marka loo eego cabbirrada qaybaha kala duwan ee billet, dooro taxanayaal kala duwan si aad u heshid waxtarka kuleylka.

4. Dhibcaha tamarta tamarta:

a) Heerka ka faa’iidaysiga tamarta sare ee kuleyliyaha induction wuxuu noqon karaa ilaa 65 ilaa 75%, halka foornada dib-u-soo-celinta dhaqameedku ay tahay kaliya 25 ilaa 30%.

b) oksaydhka dusha sare ee biilka kuleyliyaha induction waa 0.5% kaliya, halka foornada dib-u-cusboonaysiinta ay gaari karto 1.5-2%.