AOD furnace uses the option of fireproof material

AOD furnace is the fine equipment of law of argon oxygen fine, name with the abbreviate letter of name of this law English.

 

AOD law fundamental: Use the method of aeriform dilute, make pressure of carbon monoxide cent is reduced, and do not need the vacuum establishment with costly equipment.

AOD basically produces all sorts of stainless steel or wear-resisting steel with electric stove double couplet.

   

AOD furnace fastens a brick with magnesian chromium:

Furnace cap: Common magnesium chromic brick, tall aluminium but plastic, magnesium is qualitative pouring makings

Lining: Chromic brick of chromic brick of direct union magnesium, recombine magnesium, half recombine magnesium is chromic brick

Blast tuyere brick: Chromic brick of magnesium of high pure and direct union and recombine magnesium chromic brick

   

AOD furnace fastens a brick with magnesian calcium

Furnace cap: Bitumen combines dolomite brick

Furnace wall: Dolomite brick

Hearth: Magnesian dolomite brick

Blast tuyere area: Superhigh temperature is firing dolomite of frit of dolomite brick, report brick

(1) AOD body of heater puts what the tilting back ward before it is OK to be in breaks up to ask a group, secure by pin. Contain in the bottom lateral of furnace the spray gun to gas of inbreathe of bath standard way, the amount of spray gun according to the tonnage of furnace differ somewhat, raise for 2~3 commonly. The perpendicular gross ril load of the meeting-point of spray gun extension line and furnace closes. Spray gun by inner tube (copper is qualitative) the canal outside reaching (stainless steel) two composition, inner tube guides advocate blowing gas (by ArO2. Or Ar-N2 comprises) , inner tube and outside the annular aperture between the canal guides the refrigeration since Ar, N2 or air makes in order to protect spray gun. Spray gun uses up type, in the embedded when building furnace fireproof material layer, caustic is burned with lining synchronism in smelt process. The oxygen of inbreathe basically is to be used at oxidation carbon to warm up, the argon gas of inbreathe basically is strong convection agitate, when still having alloy of manufacturing tall nitrogen, can undertake nitrogen undertakes alloy is changed blowing, since can undertake developing nitrogen, this pair of basic production 21-4N kind steel is planted in saved nitride of a lot of metals, if nitrogen changes the affiliation of subsidiary channels in the human body through which vital energy to measure, save cost of a lot of production.

(2) process of VOD furnace decarbonization divides a level, namely vacuum boasts oxygen decarbonization phase and vacuum decarbonization level. Blowing what the initial stage of oxygen decarbonization happens about 2 minutes above all to take off silicon, begin decarbonization subsequently, block the problem such as canal of feed in raw material up to prevent big splash right now, can take tall gun (the ≤900mm) , measure that reduces argon flow. Speed of the decarbonization that blow oxygen and temperature of the intensity that feed oxygen, intensity that blow argon, initiative carbon quantity and molten steel are concerned. Initiative carbon is 0.27% , average decarbonization speed 0.0125% ∕ Min, 0.41% when for 0.0188% ∕ Min. The bottom blows argon intensity to achieve 0.01~0.02Nm3 ∕ (the strong agitate of T·min) can reduce chromic oxidation not only, and OK and apparent land raises decarbonization rate. When steel medium carbolic content is achieved 0.08% hind should undertake vacuum decarbonization, the terminal carbon of the requirement is lower, vacuum is spent lower also, decarbonization time is longer, it is 15~30min commonly.

(1) AOD body of heater uses magnesian calcic brick dolomite brick build by laying bricks or stones builds chromic perhaps magnesia brick or Fu Mei the electric frit chromium with higher quality is used all round; spray gun magnesia brick build by laying bricks or stones is built, with bearing high temperature and steel fluid erode. Can move type furnace cap uses chromic magnesia brick or build by laying bricks or stones of aluminium magnesium brick is built, also can irrigate with heat-resisting concrete. Is the dimension scale of the chamber of a stove or furnace: roughly? : of diameter of the chamber of a stove or furnace of? of Yan Yan Tuan?  casts lofty Ji?:2: 3. Furnace in pitch the circumstance of proper point of view falls, by move steel includes molten steel, right now aeriform spray gun is in above of steel fluid face. When furnace regains erect position, in molten steel of spray gun mergence, begin to blow gas fine. After fine is finished, still tapping of classics furnace cap.
(2) because the decarbonization of VOD furnace is,undertake in vacuum v/LIT an amphora-like jar, because the operation of this VOD furnace must use automation control. Among them the control of the controls pair of whole smelt processes success of terminal carbon and content of finished product carbon is all in all. Of terminal carbon decide basically have waste gas analytic law decides carbolic way compatibly. Law of waste gas analysis is the CO in analysing waste gas with infrared analyzer, CO2 and O2 composition, the change that referenced vacuum spends, in order to control the fine process of VOD. This kind of method stays the time that blow oxygen well and truly certainly, and do not get equipment the limitation of specific requirement. Gas phase decides carbolic way is to determine the content of waste gas gross and its CO, CO2, in order to calculates those who give alkaline content to let time to reduce a curve, after achieving terminal carbon, stop blow oxygen.

Face of 1) a place with a draught

Blast tuyere face is the upside of blast tuyere area, what the lining of this area mars is very serious, because wind gun gas is in,be on one hand ejective hind, contrail of going from place to place is the curve of a similar parabola, gas enters bath along gush of blast tuyere direction above all, after contacting molten iron, gas begins circumfluence as a result of the reason of obstruction, gush of aweather mouth direction goes, but what use as a result of AOD furnace is side-blown a place with a draught, gas can come up against lining to cause when circumfluence erode, on the other hand, as a result of oxygen of wind gun inbreathe, blast tuyere face is the main position that carbolic oxygen produces reaction, local temperature achieves 1700-1800 ℃ , and blast tuyere area is in body of heater is bottom, get very great mechanical pressure, corrode so degree very heavy.

Line of 2) broken bits

The molten iron inside body of heater falls in the action of high temperature and inbreathe gas, face of molten iron fluid rolls acuteness form erode badly, accelerate corrode. Additional, in the final phase of smelt, need decides to molten iron sampling fine degree and molten iron give heat, can change bend of body of heater proper point of view at this moment, cause the molten iron inside the chamber of a stove or furnace and slag fluctuation wave motion, form the result that molten iron and slag immerse alternately to broken bits line, cause erode. Corroded line brick is original compositive structure is destroyed, molten iron and slag fall to be able to penetrate firebrick interior in physics and chemistry, accelerate further erode speed.

AOD furnace is commonly used and fireproof material:

Common magnesium chromic brick, tall aluminium but plastic, magnesium is qualitative pouring makings,

Chromic brick of chromic brick of direct union magnesium, recombine magnesium, half recombine magnesium is chromic brick,

Chromic brick of magnesium of high pure and direct union and recombine magnesium chromic brick,

Bitumen combines dolomite brick,

Dolomite brick,

Magnesian dolomite brick,

Superhigh temperature is firing dolomite of frit of dolomite brick, report brick