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. Pambuyo pa billet kuchoka ku zitsulo zopangira zitsulo zopitirirabe, kutentha kwa bedi lozizira ndi 700-900 ° C, ndipo kutentha kobisika kwa billet sikugwiritsidwa ntchito bwino.

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.

Kusanthula kwa phindu lopulumutsa mphamvu:

1. Kugwiritsidwa ntchito kwa malasha a ng’anjo yamoto yotentha yotentha yamoto ndi 80 kg / tani yachitsulo (mtengo wa calorific 6400 kcal / kg), womwe ndi wofanana ndi 72 kg ya malasha wamba; pambuyo pa kusintha kwaukadaulo, njira yogwiritsira ntchito mphamvu ndi 38 kWh pa tani yachitsulo, yomwe ndi yofanana ndi 13.3 kg Standard malasha

2. Malingana ndi chiwerengero cha pachaka cha zitsulo zopangidwa ndi zitsulo zokwana matani 600,000, ndalama zosungiramo malasha okhazikika pachaka ndi: (72-13.3) ÷ 1000 × 600,000 matani = 35,220 matani a malasha.

3. Mfundo yopulumutsa mphamvu:

Pambuyo pa billet kuchokera pamakina oponyera mosalekeza, pamwamba pamakhala kutentha kwa 750-850, ndipo kutentha kwamkati kumakhala kokwanira 950-1000 ° C. Imodzi mwa mfundo zazikuluzikulu za kutentha kwa induction ndi mphamvu ya khungu, yomwe ndi yakuti mphamvu ya kutentha imasamutsidwa pang’onopang’ono mkati kuchokera ku kutentha kwa pamwamba. Pamwambapa, gawo limodzi mwa magawo atatu a mkati mwa billet siliyenera kutenthedwa. Malinga ndi miyeso yosiyanasiyana ya billet, sankhani ma frequency osiyanasiyana kuti muzitha kutentha bwino.

4. Malo opulumutsa mphamvu:

a) Kugwiritsa ntchito mphamvu kwamphamvu pakuwotcha kolowera kumatha kukwera mpaka 65 mpaka 75%, pomwe ng’anjo yachikhalidwe yoyatsira moto ndi 25 mpaka 30% yokha.

b) Kutsekemera kwapamwamba kwa billet yotenthetsera induction ndi 0.5% yokha, pamene ng’anjo yowonongeka imatha kufika 1.5-2%.