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. Ngemuva kokuthi i-billet ikhishwe ku-caster eqhubekayo yokwenza insimbi, izinga lokushisa embhedeni wokupholisa liyi-700-900 ° C, futhi ukushisa okucashile kwe-billet akusetshenzisiwe ngokuphumelelayo.

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.

Ukuhlaziywa kwenzuzo yokonga amandla:

1. Ukusetshenziswa kwamalahle kwenqubo yokuqala ye-billet yokushisa isithando somlilo kungu-80 kg/ton of steel (inani le-calorific 6400 kcal/kg), elilingana no-72 kg wamalahle ajwayelekile; ngemva kokuguqulwa kwezobuchwepheshe, inqubo ukusetshenziswa kwamandla kungu-38 kWh ngethani lensimbi, elilingana no-13.3 kg wamalahle ajwayelekile.

2. Ngokusekelwe ekukhiqizeni okulinganiselwe konyaka kwemikhiqizo yensimbi yamathani angu-600,000, ukonga konyaka wamalahle ajwayelekile: (72-13.3) ÷ 1000 × 600,000 amathani = 35,220 amathani amalahle ajwayelekile.

3. Umgomo wokonga amandla:

Ngemuva kokuthi i-billet ikhishwe emshinini wokuphonsa oqhubekayo, ubuso bunokushisa kwe-750-850, futhi izinga lokushisa langaphakathi liphakeme ngisho no-950-1000 ° C. Enye yezimiso eziyisisekelo zokushisa kwe-induction umphumela wesikhumba, okungukuthi amandla okushisa adluliselwa kancane kancane ngaphakathi kusuka ekushiseni okungaphezulu. Ngenhla, ingxenye eyodwa kwezintathu yengaphakathi le-billet ayidingi ukushiswa. Ngokuya ngobukhulu obuhlukene be-billet cross-sectional, khetha amafrikhwensi ahlukene ukuze uthole ukusebenza kahle kokushisisa.

4. Amaphuzu okonga amandla:

a) Izinga eliphezulu lokusebenzisa amandla okushisa lokungeniswa lingaphakama lifike ku-65 kuya ku-75%, kuyilapho isithando somlilo esivuselelayo singama-25 kuya kwangu-30 kuphela.

b) I-oxidation yangaphezulu ye-billet yokushisa yokungeniswa yi-0.5% kuphela, kanti isithando somlilo sokuvuselela singafinyelela ku-1.5-2%.