Defects of traditional steel rolling process

cov 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. Tom qab lub tshuab hluav taws xob tau kos los ntawm cov hlau ua txuas ntxiv, qhov kub ntawm lub txaj txias yog 700-900 ° C, thiab cov cua sov latent ntawm lub billet tsis zoo siv.

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.

Energy-saving txiaj ntsig tsom xam:

1. Kev siv cov thee ntawm qhov qub cua sov rauv cua sov txheej txheem yog 80 kg / ton ntawm steel (calorific nqi 6400 kcal / kg), uas yog sib npaug rau 72 kg ntawm txheem thee; Tom qab kev hloov pauv thev naus laus zis, cov txheej txheem kev siv hluav taws xob yog 38 kWh ib tuj hlau, uas yog sib npaug rau 13.3 kg Standard thee.

2. Raws li kev kwv yees txhua xyoo ntawm cov khoom siv hlau ntawm 600,000 tons, kev txuag txhua xyoo ntawm cov qauv thee yog: (72-13.3) ÷ 1000 × 600,000 tons = 35,220 tons ntawm cov qauv thee.

3. Kev txuag hluav taws xob:

Tom qab lub billet tau kos los ntawm lub tshuab nruam nruam, qhov chaw muaj qhov kub thiab txias ntawm 750-850, thiab qhov kub ntawm sab hauv yog txawm tias siab li 950-1000 ° C. Ib qho ntawm cov hauv paus ntsiab lus ntawm induction cua sov yog cov nyhuv ntawm daim tawv nqaij, uas yog lub zog tshav kub maj mam hloov mus rau sab hauv los ntawm cov cua sov saum npoo. Saum toj no, ib feem peb ntawm sab hauv ntawm lub billet tsis tas yuav tsum tau rhuab. Raws li qhov sib txawv billet cross-sectional qhov ntev, xaiv cov zaus sib txawv kom tau txais cov cua kub zoo dua.

4. Cov ntsiab lus txuag hluav taws xob:

a) Lub zog siv hluav taws xob siab ntawm cov cua sov induction tuaj yeem siab li 65 txog 75%, thaum lub tshuab hluav taws xob hluav taws xob ib txwm muaj tsuas yog 25 txog 30%.

b) Qhov saum npoo oxidation ntawm induction cua sov billet tsuas yog 0.5%, thaum lub regenerative cub tawg tuaj yeem ncav cuag 1.5-2%.