Intermediate bag is the high temperature container that builds by fireproof material build by laying bricks or stones, the fireproof product that intermediate bag liner introduces has fireproof and firebrick, pouring brick of makings, heat preservation is waited a moment, rong Cheng is small today make up the firebrick that introduces liner of the bag intermediate to pledge with what material for everybody, detailed content reads please below.
The action of intermediate bag is temperature of stable molten steel, make molten steel places content rise, in short when be short of molten steel or change when steel is wrapped, can assure to connect casting direct motion. General the 15%-30% that the capacity of intermediate bag wraps for steel. Every machine that connect casting deploys 7-12 the bag intermediate. Intermediate bag has two kinds of forms, namely T form and boat form.
The molten steel temperature of intermediate bag is 1510~1570 ℃ , the service life 200~1000 of intermediate line second, abroad achieves above 1000 times. Erode line to want to achieve one is irrigated repeatedly and search a bag easily. Service life is wrapped to be 2~10h among steel especially commonly, and general carbon steel is increasing with the service life of intermediate bag, had achieved 20~40h, at present some has achieved 70h above.
Adiabatic line uses clay brick or thermal insulation board, many steelworks did not use adiabatic line, what intermediate line uses alumina generally to content is 60%-80% low cement or exceed low cement is pouring makings. Erode line to pledge with magnesium coating, heat insulation board and dry type pound dozen of makings. Intermediate bag lid uses alumina content 60% aluminous silicon are pouring makings. Concussion area is used prefab piece or tall aluminous brick. Current, useful also magnesium is qualitative prefab piece or of magnesian charcoal brick. The lasher that block broken bits uses magnesian qualitative prefabricated component and high aluminous prefabricated component, what use tall aluminium now nevertheless is less and less.
Because the capacity of intermediate bag is mixed,temperature of susceptive molten steel all has certain poor with steel bag, what use firebrick endless also and identical, bag capable person has the following requirement character among the requirement:
(1) is able to bear or endure molten steel and erode slaggily, service life is long.
(2) has good heatproof shake sex, when be being contacted with molten steel not scamper is cracked.
(3) has inferior hot conductivity and tiny heat expansile, make intermediate bag line has certain heat preservation sex and good integral sex.
(4) is in pouring water pollution of the steel in the process is little, ensure steel water quality is measured.
(The appearance with 5) liner qualitative material and structure want to facilitating build by laying bricks or stones is wrapped and disassemble.
Fireproof material line is wrapped to basically include adiabatic layer, intermediate layer and working layer among.
(1) adiabatic layer (heat-insulation layer) (10~30mm) . This are tightened be next to the intermediate carapace that include steel, main effect is right molten steel has thermal insulation, decrease pouring the Wen Jiang of the molten steel in the process, use asbestine board normally, Heat preservation brickOr pledge gently pouring makings.
(Among 2) layer (100-200mm) . Layer and this heat-insulation layer photograph are contacted, basically have the effect of safe heat preservation. At first the layer intermediate basically uses clay brick build by laying bricks or stones to build, use tall aluminous firebrick later build by laying bricks or stones is built, begin to use to 80 time evening pouring makings whole is circled note.
(3) job layer (20~50mm) . Layer and this molten steel are contacted, it is crucial position. Inchoate when use aluminous qualitative firebrick, be in to maintain steel fluid later pouring when change of temperature of fluid of the steel inside intermediate bag does not exceed 15 ℃ , working layer begins to introduce line of job of heat insulation board, heat insulation board is had later the fireproof daub makings of same function and place of fireproof spray paint are replaced, irrigate technology and water mouth to change quickly repeatedly as much heat technical development, new dry type vibration expects begin to replace fireproof spray paint with distinct advantage.
(The material end 4) bag is qualitative comparative basically with working layer. The product chooses to be corundum what qualitative, magnesian qualitative firebrick or same capable person pledge is pouring makings, also some enterprises are in pouring deserted slide brick and magnesian charcoal brick are used to undertake buildup in makings.
About intermediate bag liner uses the firebrick with what qualitative material, flourish Cheng Naicai introduces here, hope to be helped somewhat to everybody, if everybody has other doubt, greeting incoming telegram seeks advice.
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