LF furnace is refined facility has electric steel water in steel bag, be heat with electric arc method of the fine outside the furnace that is main technique feature. Its structure is main by add pyroelectricity to respect system, steel to include lid, alloy and system of feed in raw material of broken bits makings, measure the bag of Wen Quxiang aperture, steel, system that blow argon to comprise.
LF furnace is a kind of muti_function fine container, its characteristic is undertake by 3 electrode; heats through electric arc on one hand burying arc to heat build; of tall alkalinity reducing slag to undertake deoxidization, to decoke wait on one hand. To make molten steel and slag are contacted adequately, stimulative fine reaction makes molten steel temperature even, bottom inbreathe inert gase is wrapped in steel (argon is angry) have molten steel mix. Make the steel that add a person wraps the alloy inside to be achieved inside molten steel thereby change equably. LF furnace is shown like graph 3-8 place.
At the beginning of LF fine law with low sulfur, low oxygen the production of advanced steel is a purpose. Because its investment is little, the yield that can raise Zuo electric steel significantly and gain ground, show Si to make electric stove and the main equipment that match even the photograph between casting.
Take off gas to come true, LF furnace adds vacuum processing to weigh LF(V) . The vacuum device that cooperates with LF(V) basically has two kinds: RH and VD. Current, the electric stove of above of Japanese apt 80t or converter use combination of the refined outside LF+RH furnace, because the existence of the slag in steel bag does not affect RH to operate, so LF and RH combination are in what use dispute Chang Qia becomes in a pull current Cheng. The refined outside be less than 80t electric stove or converter to use LF10 VD heat is combined (steel bag wraps use) as vacuum steel. Compare with LF10 RH photograph, because broken bits amount is too large, the effect taking off gas of LF10 VD is differred slightly a few. The form of VD has two kinds again: One kind is vacuum lid direct lid is buckled go up in steel bag, call structure of bucket type vacuum. Steel bag puts another kind in a canister, call structure of vacuum of coal tub type.
The characteristic of LF(V) is: Slag is in mix condition from beginning to end, fluidity of furnace adj/LIT wide can keep inert inside furnace of; of good, reproducibility Zuo or control of temperature of reducing atmosphere; goes easily simply.
The function of LF(V) basically has the following kinds:
(I) laziness or reducing atmosphere. Use sealed or half sealed structure, hearth blows , furnace enrages the quantity that contain oxygen controallable in 1% the following, reaction of the FeO in the electrode when heating and broken bits, MnO produces C0, form reducing atmosphere.
(2) buries arc to heat. Zuo buries arc to heat with electrode of 3 black lead, electric current is stable, thermal efficiency is tall.
(3) can build reproducibility broken bits, slag alkalinity is tall (R can amount to 5 above) , liquidity is good, reproducibility tall;
(4) argon enrages agitate. Aeriform mix is adopted inside furnace, but all temperature and composition, accelerate metallurgy reaction, rise of stimulative field trash. Aeriform discharge is between 20~1800L/min, via breathing freely brick or inbreathe of roof spray gun.
When pure iron of LF(V) fine industry, take off carbon inside preexistence electric stove 0.04% . Take off further when tapping 0. 02% . When vacuum is handled, take off carbon to 0.005% , but in later period warm up in the process, carbon picks up 0.008%(basically is electrode heats and magnesian carbon brick causes fine later period to join a few aluminium (〔 A! 〕 <0. 005%) , eventually the quantity containing oxygen of steel is 28X 10-6 on average, it is 43×10-6 high.
LF(V) but the cementite steel that smoothly refine gives the quantity that contain oxygen to be less than 15X106. Use tall aluminous brick to include line only, fusible aluminium is when 0.02~0.025% limits, total oxygen measures ability under 15X10-6.
LF(V) but refine gives those who contain sulfur content to be less than 7X LO-5 to exceed low sulfur steel. In the front row inside LF(V) after second slag fine () of new broken bits is changed after fine, sulfur content from (70~110) X I0-6 falls (after the 2nd fine that 30~70)X10-6; takes off gas in vacuum, after sulfur content falls to join Ca-Al silk strong agitate to 2OXlO-6; again, sulfur content falls under 7X10-6. Fine broken bits measures the 2%~3% that weighs for steel, the fine phase after, broken bits alkalinity is 4~8. Zhengzhou flourish fills fireproof material to regard manufacturer of the adventitious of high quality fireproof material as the home, have rich manufacturing experience and practice base, stand in the forward position that the industry expands from beginning to end, pay attention to innovation of science and technology, increase the development strength to new product ceaselessly, in ensuring flourish fills material to be able to apply to more furnace kiln projects, bring good news for more projects. Flourish fills network of fireproof material official: Http://www.glzcj.com
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