Main fine craft:
1, LF(Ladle Furnace Process) ;
2, AOD(Argon-oxygen Decaburizition Process) ;
3, VOD (Vacuum Oxygen Decrease Process) ;
4, RH (Ruhrstahl Heraeus Process) ;
5, CAS-OB(Composition Adjustments By Sealed Argon -oxygen Blowing Process) ;
6, ASKA-SKF (1965, swedish ball bearing (SKF) company to improve quality of ball bearing steel, offerred the tentative plan in fluid of steel of the fine in steel bag, general and as electric as Sweden (ASEA) company cooperation built finery of the first 30t ASKA-SKF)
7, feed a clue (Insert Thread) ;
8, steel bag blows argon agitate (Ladle Argon Stirring) ;
9, dusting (Powder Injection) .
To inert gase of the inbreathe in molten steel, itself of this kind of gas does not share metallurgy reaction, but every small bleb that rises from inside molten steel is equivalent to room of small vacuum of a “ the cent crimp of the H2 in ”(bleb, N2, CO is close Yu Ling) the effect that has “ gas to wash ” .
(1) is used breathe freely brick or insert spray gun to have aeriform mix, also can use electromagnetism agitate.
(2) joins alloying element, deoxidizer and slag to change qualitative agent through deferent system.
(3) plays the solid material that includes alloy inside through spray gun gush.
(Alloy clue is fed inside bag of 4) Xiang Gang.
(All sorts of 5) vacuum take off gas technology.
(6) heats inside steel bag furnace molten steel.
(The protective technology that 7) steel sheds.
The fine outside furnace produces the principle of stainless steel, apply different CO cent to press the balance between chromium issueing carbon and temperature to concern namely. Add oxygen to undertake fine decarbonization with inert gase (alternate ceaselessly in process argon / the scale of oxygen) , the cent that can drop the CO in carbolic oxygen reaction is pressed, below the condition of inferior temperature, reduce carbolic content and chromium is not oxidized.
Steel fluid has mix to steel fluid in process of the fine outside agitate furnace, make steel fluid composition and temperature are changed equably, can promote metallurgy reaction. Most metallurgy reacts the process is reaction of phase boundary face, of reactant and resultant diffuse speed is these reaction restricted link. Steel fluid falls in static condition, metallurgy response rate is very slow, if the dormant steel fluid to decoke in electric stove needs 30 ～ 60 minutes; Churn in the fine outside furnace steel fluid undertakes desulphurization needs 3 ～ 5 minutes only, can achieve similar result. Steel fluid falls in static condition, field trash relies on rise eliminate, obedient Yusituokesi (Stokes) is mensurable, eliminate rate slower; When agitate steel fluid, the eliminate of field trash is obedient at exponential rule, the Xt in type and X0 state time S is mixed respectively begin time (the chroma of the field trash when S=0) ; K is constant, concern with the character of stirring strength, type and field trash.
Characteristic of the fine outside steel bag processing furnace is fine time short (10 ～ 30 minutes) , fine task is onefold, add shrinkage fitting buy without what temperature of compensation molten steel reduces, technology operation is simple, installation cost is little. Molten steel takes off gas, to decoke, composition is controlled and change the unit such as field trash configuration. Vacuum takes off air standard circularly (RH, DH) , steel bag plays argon way for nothing really (Gazid) , steel wraps dusting (CaSi or other powder) processing law (IJ, TN, SL) all belong to this kind.
Characteristic of the fine outside steel bag fine furnace is fine time grows (60 ～ 180 minutes of) , have a variety of fine function, what temperature of compensation molten steel reduces add shrinkage fitting buy, comfortable plant at of all kinds tall alloy steel and special function steel (if exceed pure steel,plant) fine production. Vacuum plays oxygen decarbonization way (electric arc of VOD) , vacuum heats to enrage a law (VAD) and steel include finery method (ASEA-SKF) , all belong to this kind. Return way of decarbonization of oxygen having argon similarly with this (AOD) .
Technology of the fine outside furnace is to point to in smelting furnace (converter, electric stove) on the base that produces molten steel, with more economy, effective method, improve the metallurgy technology of the physics of molten steel and chemical function. Include:
(1) is in steel bag, undertake be adjustmented further to the temperature of molten steel, composition, gas, harmful element and field trash, purify, achieve clean, even, stable goal.
(2) inter accelerates gas and rise of be mingled with in the bag, the molten steel temperature of process of stable complete mould (also call intermediate Bao Ye golden) .
(3) is in in crystallizer in purify steel be mingled with, stimulative form nucleus, crystallize equably.
Commonly used and fireproof material has electric stove: Tall aluminous brick, do not burn cyanite, firing andalusite brick, firing brick of Mo Laishi corundum.
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