CN202116578U - Production equipment of carbon structural steel plate - Google Patents

Abstract

The utility model discloses production equipment of a carbon structural steel plate. The equipment comprises a converter smelting device. The converter smelting device comprises a steel ladle, a recarburizing device and a steel ladle carbon feeding line device, wherein the recarburizing device is arranged in the steel ladle and includes high-efficiency recarburizer; and the steel ladle carbon feeding line device is arranged outside the steel ladle and capable of feeding steel to be smelted into the steel ladle through a carbon line. According to the converter smelting device disclosed by the utility model, the carbon component percentage of molten steel is effectively increased, therefore, the carbon component percentage of the produced high-quality of carbon structural steel plate for moulds, such as a No.45 module, a No.50 module, a No.55 module and the like, is up to 100%; meanwhile, because of a thermal-feeding and thermal-packaging device, the thermal-feeding time of a plate blank is strictly controlled within 24 h; the thermal-packaging temperature is not less than 280 DEG C; the temperature of the plate blank entering a heating device is increased; the breakage problem of the plate blank is effectively solved; furthermore, required energy is greatly reduced and heated; and the production cost is reduced.

Description

A kind of production unit of carbon constructional steel plate

Technical field

The utility model relates to medium and high carbon steel plate technique field, and No. 45, No. 50, No. 55 moulds of particularly a kind of production are with the production unit of quality carbon structural steel.

Background technology

Along with manufacturing continuous development, increasing to mould, especially more and more with the production demand of quality carbon structural steel to No. 45, No. 50, No. 55 moulds with the demand of structure iron.In No. 45, No. 50, No. 55 steel plate production processes now, when converter smelting was produced, the composition hit rate was low, only was no more than 95% hit rate usually.Domesticly when producing No. 45, No. 50, No. 55 quality carbon structural steels, normally after room temperature, send Steel Mill again, after heating, be rolled in the steel billet slow cooling.Because the temperature sensitivity of No. 45, No. 50, No. 55 medium and high carbon steels is strong, steel billet very easily cracks in process of cooling, even also can be owing to thermal stress causes bloom fracture under as air-cooled condition.In order to reduce the thermal stress of slab, prevent slab fracture, adopt the mode of slow cooling usually, through burial pit, add a cover means such as stay-warm case or concentrated cooling in heap, cooled off 3～5 days.Problems such as this slow cooling mode exists cooling time long, and occupied ground is big, but also waste great amount of heat energy, production cost is high.

Therefore; Need a kind of composition hit rate problem that can either solve No. 45, No. 50, No. 55 moulds, can prevent the equipment that steel billet cracks again, the composition hit rate of raising quality carbon structural steel with quality carbon structural steel; And can reduce energy dissipation, reduce production cost.

The utility model content

To the one or more problems that exist in the correlation technique, the purpose of the utility model is to provide a kind of No. 45, No. 50, No. 55 moulds production unit with quality carbon structural steel.This equipment should be able to increase No. 45, No. 50, No. 55 moulds carbon component with quality carbon structural steel, reduces bloom fracture.

For realizing above-mentioned purpose,, a kind of production unit of carbon constructional steel plate is provided according to an aspect of the utility model; This equipment comprises the converter smelting device, is provided with ladle, carburetting device and ladle in this converter smelting device and feeds the carbon line device, wherein; The carburetting device is arranged in the ladle; And contain efficient carburelant, and ladle feeds the carbon line device and be arranged on the ladle outside, and can steel-making be sent in the ladle with carbon line.

Preferably, carbon constructional steel plate comprises 45,50,55 carbon constructional steel plates.

Preferably; This equipment further comprises the hot delivery and hot charging device; This hot delivery and hot charging device is arranged on the downstream of converter smelting device, and slab heat is delivered to the heating unit that it is carried out heat treated, and wherein; The hot delivery and hot charging device comprises timing device, will pass through the transhipment time that slab that continuous casting handles is transported to heating unit to be controlled in 24 hours.

Preferably, the hot delivery and hot charging device also comprises temperature measuring equipment, is used to detect the temperature of slab, makes that the temperature when slab infeeds heating unit is not less than 280 ℃.

Preferably; Equipment further comprises a refining unit; A refining unit is arranged on the sheet billet continuous casting device upstream and in the downstream of converter smelting device, and comprises LF external refining device and RH equipment for vacuum refining, and wherein LF external refining device is arranged on the upper reaches of RH equipment for vacuum refining.

Preferably, further be provided with in a refining unit and lay respectively at LF external refining device and the outside wire feeding apparatus of RH equipment for vacuum refining, be used for feeding reductor to ladle respectively.

Preferably, reductor comprises steel core aluminium and SiCaBa.

By above-mentioned at least one technical scheme of the utility model, No. 45, No. 50, No. 55 moulds are used quality carbon structural steel to utilize aforesaid device production.Wherein, feed the carbon line device simultaneously to molten steel confession carbon, improved the carbon component hit rate of molten steel owing in the converter smelting device, being provided with carburetting device and ladle simultaneously.Simultaneously; Slab is after handling through continuous casting; Utilize timing device and the strict temperature of sending into the slab in the heating unit of controlling of temperature measuring equipment in the hot delivery and hot charging device; Make the slab of sending into heating unit be not less than 280 ℃, reduced slab temperature inside stress, solve the problem of slab fracture effectively.Because the transhipment time that the slab that the strict restriction of timing device sheet billet continuous casting is handled is transported to heating unit shortened the production cycle, and has significantly reduced production cost in 24 hour.

Description of drawings

The utility model above-mentioned and/or additional aspect and advantage from obviously with easily understanding becoming the description of embodiment, wherein below in conjunction with accompanying drawing:

Fig. 1 is the synoptic diagram of arranging according to the production unit of the utility model.

Embodiment

Consider the problem that exists in the correlation technique, the utility model provides a kind of No. 45, No. 50, No. 55 moulds production unit with quality carbon structural steel.Describe the embodiment of the utility model below in detail, the example of said embodiment is shown in the drawings.Should be understood that following is exemplary through the embodiment that is described with reference to the drawings, and only is used to explain the utility model, and can not be interpreted as the restriction to the utility model.

As shown in Figure 1, have with the device that the equipment of quality carbon structural steel comprises according to No. 45, the utility model production, No. 50, No. 55 moulds: converter smelting device 102, a refining unit 104, casting apparatus 106, hot delivery and hot charging device 108, heating unit 110 and other treatment unit 112 etc.These devices are respectively according to following production process setting: subsequent handlings such as converter smelting-refining (external refining-vacuum refinement)-sheet billet continuous casting-hot delivery and hot charging-process furnace heating-rolling.Be that the high-quality molten iron is sent in the converter smelting device 102 and smelted; Send into subsequently in a refining unit 104; Carry out external refining and vacuum refinement respectively, the molten steel that then will pass through secondary refining is delivered to and is carried out sheet billet continuous casting in the casting apparatus 106, passes through hot delivery and hot charging device 108 subsequently; Hot charging is gone into heating unit 110 and is heated, and then is rolled to wait other subsequent disposal operations.

According to the utility model embodiment, be provided with revolving furnace body, ladle, carburetting device and ladle in the converter smelting device 102 and feed the carbon line device, wherein ladle is arranged on the downstream of revolving furnace body.Revolving furnace body according to the utility model can adopt 150 tons of top-blown oxygen converters.In other embodiments, also can select suitable converter as required.

Through the carburetting device, adopt homlolgation to improve the carbon component hit rate in the molten steel.The carburetting device before molten steel gets into ladle, is placed efficient carburelant powder for can discharge the container of carburelant and to be arranged on ladle inside in the carburetting device, for example carbon content is high, ash content is few, sulphur content is low, density is big, recarburization is strong and the exsiccant carburelant.In converter smelting latter stage, after molten steel got into ladle, the carburetting device discharged efficient carburelant powder, and it is dispersed in the molten steel, thereby increased the carbon component in the molten steel.

Simultaneously, in the outside appropriate location of ladle ladle is set and feeds the carbon line device, it can feed carbon line (the for example feeding carbon line from the ladle top) in ladle, molten steel composition is finely tuned, and further improves the carbon component hit rate of molten steel, is reduced to the branch fluctuation.

Use is according to the production unit of the utility model, mould such as is preferred for producing No. 45, No. 50, No. 55 and uses quality carbon structural steel, and can make the steel plate carbon component hit rate of production reach 100%.

In the downstream of converter smelting device 102, be provided with a refining unit 104.According to the utility model, a refining unit 104 comprises external refining device and equipment for vacuum refining, and the external refining device is arranged on the upper reaches of equipment for vacuum refining.The external refining device is meant LF (ladle furnace) refining furnace with heating and agitating function.Make molten steel heating and carry out desulfurization and deoxidation through the LF refining furnace.Subsequently, molten steel gets into equipment for vacuum refining.Equipment for vacuum refining is meant RH vacuum refinement circulating degasification refining furnace, and it can carry out secondary refining to refined molten steel, with further deoxidation, desulfurization, the degassing.In a refining unit, respectively outside the LF refining furnace with the RH vacuum refining furnace outside the appropriate location be provided with wire feeding apparatus.When carrying out LF external refining and RH vacuum refinement, wire feeding apparatus feeds reductor (the for example feeding carbon line from the ladle top) in ladle, to deoxidation of molten steel.Practical according to this, it is main that reductor adopts with steel core aluminium, and an amount of reductor with addition of SiCaBa.Through a refining unit 104, can further remove the foreign material in the molten steel, improve the molten steel purity effectively.

According to the utility model embodiment, in the downstream of a refining unit 104, be provided with the casting apparatus 106 that comprises mold, through casting apparatus 106, molten steel is carried out sheet billet continuous casting.Wherein, in mold, in molten steel, add covering slag, to improve the bonding steel leakage incidence of producing slab.According to the utility model, preferred high carbon steel privacy protection slag, for example lower melting point, LV, heat-proof quality is good, volume density is low covering slag.The straight arc billet continuous casting machine of casting apparatus 106 preferred R9m according to the utility model embodiment employing.According to the utility model embodiment, the bonding steel leakage incidence of the slab of steel such as No. 45, No. 50, No. 55 of production can be controlled at below 0.2%.

As shown in Figure 1, according to the utility model embodiment,, be provided with hot delivery and hot charging device 108 in the downstream of casting apparatus 106.So-called hot delivery and hot charging is meant that within a certain period of time the slab heat with certain temperature that will from casting apparatus 106, export is sent in the heating unit 110 in downstream, and when packing slab into heating unit 110, slab should satisfy certain temperature requirement.For satisfying above-mentioned requirements, in hot delivery and hot charging device 108, be provided with timing device and temperature measuring equipment.

When molten steel process casting apparatus and after being cut into slab, this slab is infeeded hot delivery and hot charging device 108.Wherein, set timing device, make it according to slab temperature drop curve, strict control slab is transported to the transhipment time of heating unit 110.According to the utility model embodiment, the transhipment time must not be above 24 hours.And the transhipment time changes along with the variation of envrionment temperature.For example, when summer, because envrionment temperature is higher, the transhipment time of setting in the timing device is longer relatively; Otherwise in the time of in the winter time, because envrionment temperature is lower, the transhipment time of setting in the timing device is then shorter relatively.Thereby realization heat is sent requirement.

Also be provided with temperature measuring equipment in the hot delivery and hot charging device 108, be used to measure the board briquette of heating unit 110 of packing into.Set temperature measuring equipment, make it measure board briquette, and according to the board briquette decision that records whether with this slab heating unit 110 of packing into.According to the utility model embodiment, when the temperature of measuring is not less than 280 ℃, then tested steel slab is gone in the heating unit 110; When the temperature of measuring was lower than 280 ℃, then tested slab was not packed in the heating unit 110.Thereby realize the hot charging requirement.When the embodiment according to the utility model sets timing device, and according to the rules during transhipment time transhipment slab, the board briquette of sending into heating unit 110 generally remains on more than 400 ℃, and the board briquette disqualification rate of measuring is lower than 2%.

Hot delivery and hot charging device 108 through the utility model embodiment; Can improve pack into the temperature of heating unit 110 of slab effectively; Reduce slab temperature inside stress, thereby solve slab breakage problem when mould such as producing No. 45, No. 50, No. 55 effectively with quality carbon structural steel.And lower the needed energy of heating significantly,, can lower about 15% gas consumption according to the embodiment of the utility model.

According to the utility model embodiment, heating unit 110 preferred pusher-type furnaces.

According to the utility model embodiment, the downstream of heating unit 110 are provided with aftertreatment device 112,2800mm two-shipper frame four roll reversing rollers that for example slab are rolled.

Production unit according to the utility model; Feed the carbon line device owing to be provided with carburetting device and ladle in the converter smelting device 102; In molten steel, infeed carbon simultaneously; Improve the carbon component hit rate of molten steel effectively, mould such as make to reach 100% No. 45, No. 50, No. 55 of production with the carbon component hit rate of quality carbon structural steel.Simultaneously; Owing between casting apparatus 106 and heating unit 110, hot delivery and hot charging device 108 is set, the heat of strict control slab send the time to be no more than 24 hours, and the hot charging temperature is not less than 280 ℃; Improve the temperature that slab gets into heating unit 110; Solve the slab breakage problem effectively, and lower the needed energy of heating significantly, reduce production costs.In addition, because the strict restriction slab transhipment time shortens the production cycle, can also reduce the needed place of slab slow cooling.

Although illustrated and described the embodiment of the utility model; For those of ordinary skill in the art; Be appreciated that under the situation of principle that does not break away from the utility model and spirit and can carry out multiple variation, modification, replacement and modification that the scope of the utility model is accompanying claims and be equal to and limit to these embodiment.

Claims (6)

1. the production unit of a carbon constructional steel plate is characterized in that, said equipment comprises the converter smelting device; Said converter smelting device comprises ladle, carburetting device and ladle hello carbon line device; Wherein, said carburetting device is arranged in the said ladle, and contains efficient carburelant; And said ladle feeds the carbon line device to be arranged on said ladle outside, and can steel-making be sent in the said ladle with carbon line.

2. equipment according to claim 1 is characterized in that, said carbon constructional steel plate comprises 45,50,55 carbon constructional steel plates.

3. equipment according to claim 1 and 2; It is characterized in that said equipment further comprises the hot delivery and hot charging device, said hot delivery and hot charging device is arranged on the downstream of said converter smelting device; And slab heat delivered to the heating unit that it is carried out heat treated; And wherein, said hot delivery and hot charging device comprises timing device, will pass through the transhipment time that slab that continuous casting handles is transported to heating unit to be controlled in 24 hours.

4. equipment according to claim 3 is characterized in that, said hot delivery and hot charging device also comprises temperature measuring equipment, is used to detect the temperature of said slab, makes that the temperature when said slab infeeds said heating unit is not less than 280 ℃.

5. equipment according to claim 4; It is characterized in that; Said equipment further comprises a refining unit; Said a refining unit is arranged on said sheet billet continuous casting device upstream and in the downstream of said converter smelting device, and comprises LF external refining device and RH equipment for vacuum refining, and wherein said LF external refining device is arranged on the upper reaches of said RH equipment for vacuum refining.

6. equipment according to claim 5 is characterized in that, further is provided with in the said a refining unit to lay respectively at said LF external refining device and the outside wire feeding apparatus of RH equipment for vacuum refining, is used for feeding reductor to ladle respectively.

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