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 mor’a hore billet e huloe ho tloha ka tšepe e tsoelang pele e entsoeng ka tšepe, mocheso holim’a bethe e pholileng ke 700-900 ° C, ‘me mocheso o patehileng oa billet ha o sebelisoe ka katleho.

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.

Tlhahlobo ea melemo ea ho boloka matla:

1. Tšebeliso ea mashala a mokhoa oa pele oa ho futhumatsa sebōpi sa ho futhumatsa sebōpi ke 80 kg / tonne ea tšepe (tekanyo ea calorific 6400 kcal / kg), e lekanang le 72 kg ea mashala a tloaelehileng; ka mor’a phetoho ea theknoloji, ts’ebetso ea tšebeliso ea matla ke 38 kWh ka tonne ea tšepe, e lekanang le 13.3 kg ea mashala a tloaelehileng.

2. Ho itšetlehile ka tlhahiso ea selemo le selemo ea lihlahisoa tsa tšepe tsa lithane tse 600,000, polokelo ea selemo le selemo ea mashala a tloaelehileng ke: (72-13.3) ÷ 1000 × 600,000 lithane = lithane tse 35,220 tsa mashala a tloaelehileng.

3. Molao-motheo oa ho boloka matla:

Ka mor’a hore billet e huloe mochine o tsoelang pele oa ho lahla, bokaholimo bo na le mocheso oa 750-850, ‘me mocheso o ka hare o bile o le holimo ho 950-1000 ° C. E ‘ngoe ea melao-motheo ea ho futhumatsa ha induction ke phello ea letlalo, e leng hore matla a mocheso a fetisetsoa butle-butle ka hare ho tloha mocheso oa holim’a metsi. Ka holimo, karolo ea boraro ea bokahare ba billet ha e hloke ho futhumatsoa. Ho ea ka litekanyo tse fapaneng tsa likarolo tsa billet, khetha maqhubu a fapaneng ho fumana katleho e ntle ea ho futhumatsa.

4. Lintlha tse baballang matla:

a) Sekhahla se phahameng sa tšebeliso ea matla a ho futhumatsa ka induction se ka ba holimo ho 65 ho isa ho 75%, ha sebōpi sa setso sa ho futhumatsa se futhumatsang e le 25 ho 30% feela.

b) Bokaholimo ba oxidation ea billet e futhumatsang ea induction ke 0.5% feela, ha sebōpi se nchafatsang se ka fihla ho 1.5-2%.