CN103433471A - Spheroidizing method of nodular cast iron - Google Patents
Spheroidizing method of nodular cast iron Download PDFInfo
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Abstract
The invention relates to a spheroidizing method for producing nodular cast iron. According to the spheroidizing method, a melted whole rare earth ferrosilicon magnesium alloy spheroidizing agent containing not more than 20% of Mg, not more than 70% of Si and not more than 3% of RE is put into a reaction chamber built in the spheroidizing ladle and carrying out an inter-ladle pouring process, wherein the addition amount of the spheroidizing agent is only 0.4%-0.8% of the weight of the melted iron to be processed; the spheroidizing reaction time is controlled accurately, the temperature of the melted iron in the spheroidizing and pouring processes is less reduced, absorption rates of Mg, RE and Si after spheroidization are high, the addition amount of the spheroidizing agent is only one third of that of the traditional process, and thus the spheroidizing cost can be reduced by 50%; the production environment in the production and use processes of the spheroidizing agent is improved, and the product quality is improved. Compared with the traditional rare earth ferrosilicon magnesium alloy spheroidizing agent with rare earth element RE of 2-8%, the use amount of the rare-earth element RE is reduced by 50-75% by using the spheroidizing method for producing nodular cast iron for spheroidization.
Description
Technical field
The invention relates to the nodulizing process of producing spheroidal graphite cast-iron, more specifically say nodulizer is put into to the indoor nodulizing process that pours Bao Neifa carried out of spheroidizing reacion that the spheroidising bag is built by laying bricks or stones.
Background technology
In the enterprise that produces nodular iron casting, extensively adopt rare earth magnesium ferrosilicon alloy as nodulizer.The rare earth magnesium ferrosilicon alloy nodulizer is the current both at home and abroad nodulizer of consumption maximum, but at it in traditional production process energy consumption high, melting loss is large, environmental pollution is serious, traditional nodulizer is because the absorptivity of magnesium is low, its addition is larger.For a long time, technical staff both domestic and external has carried out unremitting effort research to the production technology that pours Bao Neifa spheriodization process thereof technology and rare earth ferrosilicomagnesium nodulizer.
At present, as adopting, nodulizer pours the production technology of Bao Neifa spheroidising take rare earth ferrosilicomagnesium, when tapping temperature more than 1480 ℃, spheroidising wraps under the red heat bag state of continuous use, and Mg content is >=8% the time, and the spheroidizing reacion situation is aggravated with the rising of temperature, strong magnesium light occurs, even cause molten iron to splash, result is that the absorptivity of effective element Mg and RE reduces, and causes the molten iron later stage decline through spheroidising, and nodulizing grade descends.Traditional solution is 1. when the melting nodulizer, to add a certain amount of SiCa alloy to improve containing Ca to measure to alleviate its explosive reaction, increases the SiCa alloy and makes undoubtedly production cost increase and during the slag that produces after spheroidizing reacion finishes easily is deposited in molten iron.2. the Mg content in nodulizer is controlled at 8% left and right or≤8% alleviate reaction.3. in the rare earth ferrosilicomagnesium nodulizer drops into the dykes and dams of ladle, cover pig scrap thereon and beat in fact, also having and in bag, add dead head, bushel iron piece to reduce molten iron reaction temperature in bag.4., after dropping into nodulizer and breed ferrosilicon in bag, cover the poly-slag agent of perlite thereon or cover iron plate thereon.Although above-mentioned measure produces effect to the violent situation of controlling the magnesium alloy reaction, but reaction finishes, the molten iron cooling is larger, and the molten iron surface scum is many, the stability of spheroidizing reacion is subject to the impact of molten iron temperature and changes, and the absorptivity fluctuation range of effective element Mg, RE and Si is large; When higher for the base iron sulfur content of high temperature liquid iron before nodularization of cupola melting, only taking to improve the addition of nodulizer and increase the content of RE and Ca in nodulizer, is very limited and under the high-temperature process situation, the content of Mg in nodulizer is increased again at present.
In producing the enterprise of nodular iron casting, when the more and silicon content of the foundry returns ratio of generation is higher, need to use the lower nodulizer of silicon content.Traditional low-silicon nodulizer silicon content is 5～10% left and right, when spheroidising, 1/3 left and right that the addition of low-silicon nodulizer is whole nodulizer additions, surplus is the rare earth magnesium ferrosilicon alloy that silicon content is 40～41%, while all adopting low-silicon nodulizer, be greater than the red heat bag of 1480 ℃ in tapping temperature and feed intake while processing, the phenomenon that molten iron splashes occurs, the cylindric nodulizer of tradition compacting is cracky when carrying, the influence of fluctuations spheroidising result of its chemical composition stable.
The applicant has applied for that on March 4th, 2013 Chinese invention patent publication No. CN103146870A name is called two patent applications that " spheroidal graphite cast-iron nodularization processing method " and Chinese invention patent publication No. CN103146986A name are called " spheroidal graphite cast-iron low-silicon nodulizer and application thereof ", the spheroidizing reacion chamber that utilization is built in the nodularization bag, whole rare earth ferrosilicomagnesium nodulizer or low-silicon nodulizer are put in the spheroidizing reacion chamber, rely on the charge door of arch brick and band steel sealing nodularization reative cell, whole rare earth ferrosilicomagnesium nodulizer is limited in the reative cell of nodularization bag, the magnesium vapor produced during spheroidizing reacion is by reserved lower reaction mouthful, middle reaction gap, upper reaction gap is to external diffusion, move the problem floated after having solved whole rare earth ferrosilicomagnesium nodulizer melting loss, solved while pouring the Bao Neifa spheroidising and reacted violent molten iron and splash, the problem that the effective element absorptivity is low, when the chemical composition of processed molten iron and processed weight of molten iron change, can adjust at any time the addition of nodulizer.Its weak point is that operational sequence reinforced at the nodulizer of production scene and the sealing charge door is more loaded down with trivial details, and after reative cell charge door place dross, the follow-up operation of impact, be not suitable for large batch of continuous production.
Summary of the invention
The purpose of this invention is to provide a kind of easy to operate and spheroidal graphite cast-iron nodularization processing method that can carry out continuously, that nodulizer is put into to the indoor nodulizing process that pours Bao Neifa carried out of the spheroidizing reacion of building by laying bricks or stones in the nodularization bag, solved the problem that while pouring the Bao Neifa spheroidising, reaction is violent, the effective element absorptivity is low, accurately control the spheroidizing reacion time, improve the quality of products, reduce production costs, easy and simple to handle, give full play to and utilize resource, significantly improve the production environment of nodulizer manufacturing process and use procedure.Utilize Chinese invention patent publication No. CN103146870A name to be called " spheroidal graphite cast-iron nodularization processing method ", by the percentage by weight of the contained element that melts, be: containing Mg≤20%, be poured in the model that is its four sides, interval by cooling iron containing Si≤70% with containing the whole rare earth ferrosilicomagnesium inoculant alloy liquid of RE≤3%, until aluminium alloy, solidify, just obtained the whole rare earth ferrosilicomagnesium nodulizer of the first specification of required weight without the outer lining steel pipe after cooling; As Figure of description 1 to the spheroidising bag of building the chamber that responds as shown in accompanying drawing 3 by laying bricks or stones: built left vertical plane baffle plate and right vertical plane baffle plate in the bottom of spheroidising bag by laying bricks or stones, in the top level of left vertical plane baffle plate and right vertical plane baffle plate, built semicircle shape reative cell upper cover plate by laying bricks or stones; Vertical plane at reative cell is provided with one or more reative cell charge doors, the opening direction of reative cell charge door is in the face of the position at nodularization bag Bao Zui place, the upper end of a charge door offers relief groove therein, the upper end of relief groove is concordant with semicircle shape reative cell upper cover plate, and the outer vertical of left vertical plane baffle plate and right vertical plane baffle plate is concordant with the vertical plane of semicircle shape reative cell upper cover plate; After the spheroidising bag that constructs is dried for spheroidising.
In at present known various nodulizing process, mainly be divided into the nodulizer of magnesium alloy, the nodulizer of core-spun yarn and the nodulizer that pure magnesium is processed, although the silicon content difference in various nodulizers, silicon content is by 0～≤ 70%, but when adopting the diverse ways spheroidising, for the requirement of guarantee fund's phase constitution and mechanical performance, it is necessary adding appropriate ferrosilicon to breed; Therefore, when the examination diverse ways carries out spheroidising and calculates its spheroidising expense, should consider this silicon factor that increases of bringing of nodulizer after spheroidising; When adopting the high temperature liquid iron spheroidising, during the traditional handicraft liquid iron balling, the reaction of violent boiling, not only cause the absorptivity of Mg low, and the absorptivity of Si also decreases.Utilize the reaction chamber structure of above-mentioned spheroidising bag, the easy floating phenomenon of nodulizer while having prevented spheroidizing reacion, therefore the proportion of above-mentioned nodulizer itself can be lower than the proportion of traditional rare earth ferrosilicomagnesium nodulizer, select suitable magnesium silicon significantly to improve again the magnesium content in the nodulizer than the fusing point that can increase nodulizer, except containing the Fe amount that ferrosilicon itself is brought into, do not need additionally to add steel scrap, so in above-mentioned nodulizer, the total content of effective element Mg, the Si of spheroidizing reacion and RE is higher.
The reaction chamber structure that utilizes above-mentioned spheroidising bag by required add weight containing Mg≤20%, containing Si≤70%, containing the rare earth ferrosilicomagnesium nodulizer of RE≤3%, first drop into reative cell, then 72 ferrosilicon inovulants are placed on to reative cell; Because nodulizer is placed in reative cell, reative cell charge door and relief groove be the unique passage that pours molten iron in bag, the 72 ferrosilicon inovulants that pile up at reative cell charge door place have further hindered molten iron and have entered reative cell; So spheroidizing reacion just formally starts after the molten iron that enters the nodularization bag surpasses reative cell cover plate end face certain altitude.Except reative cell charge door and relief groove, the injection of the high pressure magnesium vapor that enters and produce while reacting of high temperature liquid iron does not have the approach of other convective exchange, and the ferrosilicon inovulant in reative cell has been increased the silicon content of reative cell inner metal liquid when reaction by fusing progressively; The structural design of reative cell has played the effect in decompression storehouse, the effect that the high pressure magnesium vapor produced while having realized spheroidizing reacion discharges after step-down in the decompression storehouse again; The vigorous reaction when combination of above-mentioned factor is reacted stabilizing nodulizer, the absorptivity of raising magnesium have played key effect; Reative cell charge door and relief groove the effective state of controlling spheroidizing reacion is set, the magnesium vapor produced while forcing spheroidizing reacion spreads along nodularization bag bottom level direction, the easy floating phenomenon of nodulizer when the plate washer of reative cell vertical plane has effectively prevented spheroidizing reacion, above-mentioned favorable factor has improved the absorptivity of magnesium significantly.
According to above-mentioned nodulizing process, adopt Antaciron liquid One-step production rare earth ferrosilicomagnesium inoculant alloy liquid or the electric furnace secondary remelting method of mine heat furnace smelting to produce rare earth ferrosilicomagnesium inoculant alloy liquid, rare earth ferrosilicomagnesium inoculant alloy liquid is poured in the mould that is its four sides, interval by cooling iron, treat that it solidifies, the required weight of the above-mentioned the first specification of cooling rear acquisition, whole rare earth ferrosilicomagnesium inoculant alloy without the outer lining steel pipe, the inoculant alloy liquid upper cover plate arranged above model, when rare earth ferrosilicomagnesium inoculant alloy liquid is poured into a mould, effectively limited the exposed area of rare earth ferrosilicomagnesium inoculant alloy liquid upper surface, after pouring, with the upper cover foundary weight, the rare earth ferrosilicomagnesium inoculant alloy fluid-tight exposed is closed, rare earth ferrosilicomagnesium inoculant alloy liquid is rapid cooled and solidified under closed state, reduced the Segregation of Chemical Composition of nodulizer.
According to above-mentioned nodulizing process, in order further to improve the utilization rate of rare earth element, utilize the outer lining rectangular steel tube, the rare earth ferrosilicomagnesium of lanthanum cerium mischmetal metal or ree content≤50% is placed on to the middle part of outer lining rectangular steel tube, the mg-si master alloy pruinescence forcing press compacting at outer lining rectangular steel tube two ends; The mode of mg-si master alloy pruinescence forcing press compacting that selection is placed on the rare earth ferrosilicomagnesium of lanthanum cerium mischmetal metal or ree content≤50% at middle part, the outer lining rectangular steel tube two ends of outer lining rectangular steel tube adds rare earth element in reative cell, and coordinate will without the outer lining steel pipe, without the RE composition containing Mg≤20%, containing the magnesium ferrosilicon nodulizer of Si≤70%, add in reative cell and carry out spheroidising; Molten iron pours the reative cell of nodularization bag, after spheroidizing reacion starts, finally being less than in reaction time of 50% of whole spheroidizing reacion process, lanthanum cerium mischmetal metal in the outer lining rectangular steel tube or the rare earth magnesium ferrosilicon alloy of ree content≤50% start to participate in spheroidizing reacion, effectively supplement required ree content.
Utilize the reaction chamber structure of above-mentioned spheroidising bag, select as required the low-silicon nodulizer of the second specification to carry out spheroidising.The feature of low-silicon nodulizer is: the percentage by weight contained at the inner various elements of outer lining rectangular steel tube is as follows, magnesium elements is to take the mode that silicon content is 10～20% surpluses mg-si master alloy powder that is magnesium to add, its addition is 12～15%, in the outer lining rectangular steel tube, total silicon content is 15～25%, containing Ca1～2%, containing RE0.5～1%, the pulverulent material that surplus is Fe and the rare earth magnesium ferrosilicon alloy of magnesium content≤5% divide and are laminated into, and make the Integral ball agent; The material be pressed in its outer lining rectangular steel tube is: silicon content is the mg-si master alloy that 10～20% surpluses are magnesium, its granularity is less than 1mm, silicon content is at 50～60% ferrosilicon powder, its granularity is less than 1mm, calcium content is wherein brought into the calcium content in ferrosilicon or is added in the mode of calcium-silicon, its granularity is less than 1mm, and rare earth composition adds in the mode of the rare earth magnesium ferrosilicon alloy of magnesium content≤5%, and its granularity is less than 15mm.Its preparation method is by the silicon content of required total amount 50% in the outer lining rectangular steel tube, to be first that mechanical mixture is even in proportion for 10～20% surpluses be magnesium mg-si master alloy powder, ferrosilicon powder and iron powder, the employing forcing press is the end at the outer lining rectangular steel tube by its compacting, by in the middle of the rare earth magnesium ferrosilicon alloy that is less than 5%Mg content is placed on, then mg-si master alloy powder, ferrosilicon powder and iron powder compound that other 50% the silicon content that mixes is 10～20% are packed in the outer lining rectangular steel tube and be compacted into the identical plane of same outer lining rectangular steel tube length with forcing press.
Above-mentioned low silicon nodulizing process, adopt outer lining rectangular steel pipe displacement outer lining rectangular steel tube.
Utilize the reaction chamber structure of above-mentioned spheroidising bag, select as required the third specification without Si nodularizer, when being less than 1430 ℃, the molten iron temperature of spheroidising selects the spheroidising of carrying out without Si nodularizer, be that cuboid metal MAG block is placed in the outer lining rectangular steel tube of both ends open without Si nodularizer, isolated by the refractory material of consolidation between cuboid metal MAG block and outer lining rectangular steel tube; By without Si nodularizer, being placed in the ladle reative cell and carrying out spheroidising of the cuboid metal MAG block of the refractory material of outer lining rectangular steel tube and consolidation, the length of refractory material of adjusting the size of the area of exposed metal MAG block and outer lining rectangular steel tube and increasing length, outer lining rectangular steel tube and the consolidation of metal MAG block can extend the time of molten iron reaction effectively.Can realize smokeless spheroidising by test empirical evidence said method for many years.
Utilize the reaction chamber structure of above-mentioned spheroidising bag, select as required the nodulizer of above-mentioned suitable kind, its spheroidising step is as follows:
A, by the whole rare earth ferrosilicomagnesium nodulizer without the outer lining steel pipe of required weight or low-silicon nodulizer or put into without Si nodularizer in the reative cell of spheroidising bag;
B, the ferrosilicon inovulant is placed in the reative cell of spheroidising bag, the ferrosilicon inovulant is deposited in reative cell charge door place;
C, molten iron pour the spheroidising bag and carry out spheroidizing reacion;
D, spheroidizing reacion scratch clean scum silica frost after finishing, and adopt and add the composite inoculant that weight 0.1% granularity≤5mm composition is Mg3～6%, RE1～2%, Si40～50% to cover molten iron.
Spheroidising bag with reaction chamber structure as above, for the molten iron cooling that reduces spheroidising and the escape that prevents effective element, in spheroidising and casting process, add the covering clad in the ladle upper end.
Beneficial effect of the present invention:
Because whole rare earth ferrosilicomagnesium nodulizer is limited in the reative cell of spheroidising bag, the magnesium vapor produced during spheroidizing reacion by reserved reative cell charge door and relief groove to external diffusion, move the problem floated after having solved whole rare earth ferrosilicomagnesium nodulizer melting loss, solved while pouring the Bao Neifa spheroidising problem that violent molten iron splashes, the effective element absorptivity is low of reacting.When the chemical composition of processed molten iron and processed weight of molten iron change, can adjust at any time the addition of nodulizer.Can accurately control the spheroidizing reacion time, in the situation that the molten iron temperature poured fluctuates<100 ℃, the spheroidizing reacion time, upper lower deviation was less than for 5 seconds.With traditional containing Mg8%, containing RE5% and nodulizer containing Si41% with without the outer lining steel pipe containing Mgl5%, compare with the Integral ball agent containing Si54% containing RE1%, the whole rare earth ferrosilicomagnesium nodulizer without the outer lining rectangular steel tube that adopts One-step production or electric furnace secondary remelting method to produce compares with traditional rare earth ferrosilicomagnesium nodulizer, the production cost of its spheroidising can reduce by 50%, and when spheroidising, whole rare earth ferrosilicomagnesium nodulizer adds weight to reduce by 60% than traditional nodulizer; Through evidence, the new technology spheroidization treatment temperature is when changing between 1450 ℃～1588 ℃, and whole rare earth ferrosilicomagnesium nodulizer addition is constant, and the spheroidizing reacion time is substantially constant, on the nodularization result without impact; Utilize the above-mentioned spheroidising with reaction chamber structure can carry out low-silicon nodulizer or without the spheroidising of Si nodularizer.When above-mentioned nodulizing process has overcome the traditional handicraft spheroidising, along with the rising of nodularization temperature need increase the problem of the addition of nodulizer; Improved the production environment of nodulizer manufacturing process and use procedure.In spheroidising and casting process, molten iron cooling has produced remarkable result less and to the decaying spheroidisation that the loss that prevents magnesium and escape cause, the absorptivity of effective element Mg, RE and Si is high, for rare earth elements RE content at 2～8% traditional rare earth magnesium ferrosilicon nodulizer, adopt this technique, the consumption of its rare earth elements RE can reduce by 50～75%.
The accompanying drawing explanation:
Fig. 1 is without pack into the cutaway view of the spheroidising bag of building the chamber that responds by laying bricks or stones of the whole rare earth ferrosilicomagnesium nodulizer of outer lining rectangular steel tube.
Fig. 2 is without pack into the top view of the spheroidising bag of building the chamber that responds by laying bricks or stones of the whole rare earth ferrosilicomagnesium nodulizer of outer lining rectangular steel tube.
Fig. 3 is without pack into the A-A direction cutaway view of the spheroidising bag of building the chamber that responds by laying bricks or stones of the whole rare earth ferrosilicomagnesium nodulizer of outer lining rectangular steel tube.
Description of reference numerals: 1 is the spheroidising bag, and 2 is left vertical plane baffle plate, and 3 for reaching right vertical plane baffle plate, 4 is semicircle shape reative cell upper cover plate, and 5 is the reative cell charge door, and 6 is relief groove, 7 is nodularization bag bag mouth, and 8 is the whole rare earth ferrosilicomagnesium nodulizer without the outer lining rectangular steel tube.
The specific embodiment:
The nodulizing process of above-mentioned spheroidal graphite cast-iron, by the whole rare earth ferrosilicomagnesium nodulizer 8 without the outer lining rectangular steel tube of required weight or low-silicon nodulizer or put into the mode in reative cell without Si nodularizer: 1. can be by spheroidising bag 1 90-degree rotation angle, by reative cell charge door 5 upward, with the long handle feeding tool, above-mentioned nodulizer is added smoothly in the reative cell of spheroidising bag 1; 2. spheroidising bag 1 does not rotate, and adopts special-purpose fixture and instrument that above-mentioned nodulizer is placed in the reative cell of spheroidising bag 1.
The nodulizing process of above-mentioned spheroidal graphite cast-iron, the left vertical plane baffle plate 2 of spheroidising bag 1 reative cell, right vertical plane baffle plate 3 and semicircle shape reative cell upper cover plate 4 adopt refractory fireclay block to build, more than can continuous balling when the high temperature liquid iron spheroidising processing 35 bags time, because chamber designs is reasonable, clean without dross in reative cell after spheroidising.Entrust refractory material factory that left vertical plane baffle plate 2, right vertical plane baffle plate 3 and semicircle shape reative cell upper cover plate 4 are merged into a single whole and be processed into the refractory brick of required geomery, also left vertical plane baffle plate 2, right vertical plane baffle plate 3 and semicircle shape reative cell upper cover plate 4 can be manufactured respectively to the refractory brick of required geomery; Select the refractory material of clay brick, high silica brick, high magnesia brick to make the assembly of left vertical plane baffle plate 2, right vertical plane baffle plate 3 and semicircle shape reative cell upper cover plate 4; Or select the refractory material of clay brick, high silica brick, high magnesia brick to make respectively left vertical plane baffle plate 2, right vertical plane baffle plate 3 and semicircle shape reative cell upper cover plate 4.
For the low-silicon nodulizer of the second specification in the nodulizing process of above-mentioned spheroidal graphite cast-iron, the RE content of the rare earth magnesium ferrosilicon alloy of the magnesium content in the outer lining rectangular steel tube of low-silicon nodulizer≤5% is 15～50%.
Low-silicon nodulizer for the second specification in the nodulizing process of above-mentioned spheroidal graphite cast-iron, the even ripple disable of composition in order to ensure the whole low-silicon nodulizer of each exert pressure consolidation, adopt each independently after the independent batching of the interior nodulizer of outer lining rectangular steel tube, to carry out again the mechanical uniform mixing, employing 100 tons or 360 tons of forcing press compactings in batches after mixing.The low-silicon nodulizer chemical composition that guarantees same specification outer lining rectangular steel tube is identical, segregation-free.The wall thickness of outer lining rectangular steel tube is chosen in 2～4mm just can meet the needs of spheroidising.
Because the fusing point of 75 ferrosilicon is 1300 ℃, the fusing point of 72 ferrosilicon is 1280 ℃, the fusing point of 65 ferrosilicon is 1250 ℃, the fusing point of 50 ferrosilicon is 1220 ℃, therefore, select the ferrosilicon approaching with the fusing point of the whole rare earth ferrosilicomagnesium nodulizer 8 without the outer lining rectangular steel tube to drop into reative cell as inovulant, the pressure of the magnesium vapor produced in the time of can effectively reducing spheroidizing reacion; When selecting low-silicon nodulizer or carrying out spheroidising without Si nodularizer, drop into 50 ferrosilicon preferably as inovulant in reative cell.
According to above-mentioned nodulizing process, when low for tension-active element in base iron composition before nodularization, can adopt with without the outer lining steel pipe, without the RE composition containing Mg≤20%, containing the magnesium ferrosilicon nodulizer displacement of Si≤70%, without the whole rare earth ferrosilicomagnesium nodulizer 8 of outer lining steel pipe, carry out spheroidising.
According to above-mentioned nodulizing process,, duration of pouring lower for molten iron sulfur-bearing after spheroidising more in short-term, cancelled composite inoculant and covers molten iron after spheroidizing reacion finishes to skim:; D after changing in the spheroidising step, spheroidizing reacion scratch clean scum silica frost after finishing.
According to above-mentioned nodulizing process, when low for molten iron sulfur-bearing after spheroidising, cancel above-mentioned composite inoculant and covered molten iron after spheroidizing reacion finishes to skim; Adopt and only add the silicon titanate innoculant of processing weight of molten iron 0.2% granularity≤5mm to be covered molten iron.
Embodiment 1: under the cold blast cupola melting condition, carry out, adopt the reaction chamber structure of spheroidising bag 1 shown in accompanying drawing, first will pack in the reative cell charge door of spheroidising bag without the whole rare earth ferrosilicomagnesium nodulizer of outer lining rectangular steel tube, again 72 ferrosilicon inovulants are placed in reative cell, it is 1000kg that every bag is processed weight of molten iron, red heat bag continuous operation is used, the poor molten iron temperature that taps a blast furnace is 1490 ℃, base iron sulfur content 0.062%, whole rare earth ferrosilicomagnesium nodulizer without the outer lining rectangular steel tube contains Mg14.5%, containing RE1.3% with containing Si63.25%, its weight dropped into without the whole rare earth ferrosilicomagnesium nodulizer of outer lining rectangular steel tube accounts for 0.8% of processed weight of molten iron, 72SiFe innoculant adding quantity 0.8% in reative cell, do not cover iron filings and perlite in bag when spheroidizing reacion, spheroidizing reacion finish the to skim addition of rear secondary composite inoculant is 0.10%, 2 minutes and 35 seconds spheroidizing reacion time, the total overall reaction process is even spurting reaction, without magnesium light molten iron boiling reaction, spheroidizing reacion finishes sampling in rear 16 minutes 30 seconds, 2 grades of nodulizing grades, and the test data of Y-block: tensile strength is 568N/mm2, percentage elongation 12.5%, hardness HB230.
Embodiment 2: under the electrosmelting of intermediate frequency condition, carry out, adopt the reaction chamber structure of spheroidising bag 1 shown in accompanying drawing, employing is packed into without the whole rare earth ferrosilicomagnesium nodulizer of outer lining steel pipe in the reative cell of nodularization bag, it is 1000kg that every bag is processed weight of molten iron, electric furnace molten iron discharging temperature is 1588 ℃, base iron sulfur content 0.025%, whole rare earth ferrosilicomagnesium nodulizer without the outer lining rectangular steel tube contains Mg14.5%, containing RE1% with containing Si58%, the weight without the whole rare earth ferrosilicomagnesium nodulizer of outer lining rectangular steel tube added accounts for 0.50% of processed weight of molten iron, add 0.8% 72SiFe inovulant in reative cell, spheroidizing reacion finishes to skim, and to be covered its addition of molten iron be 0.15% for the silicon titanate innoculant of rear employing granularity≤5mm, do not covering in iron filings and perlitic situation, the spheroidizing reacion time was at 1 minute and 25 seconds, the total overall reaction process is even spurting reaction, spheroidizing reacion is steady, without molten iron, splash, sulfur content of hot metal 0.008% after spheroidizing reacion finishes, magnesium content 0.048%, spheroidizing reacion finishes sampling in 12 minutes, 2 grades of nodulizing grades.
Embodiment 3: under the electrosmelting of intermediate frequency condition, carry out, adopt the reaction chamber structure of spheroidising bag 1 shown in accompanying drawing, process molten iron 917Kg, 1483 ℃ of spheroidisings of tapping a blast furnace, in the reative cell of nodularization bag, add the Integral ball agent without the outer lining rectangular steel tube to contain Mg14%, contain RE1% and contain Si63.5%, the weight without the whole rare earth ferrosilicomagnesium nodulizer of outer lining rectangular steel tube added accounts for 0.48% of processed weight of molten iron; Add 0.8% 72SiFe inovulant, its granularity≤25mm in reative cell; The total reaction time of spheroidizing reacion is 101 seconds, in reaction, is smokeless boiling reaction after 30 seconds, and the chill block that cross dimensions is 25mm * 50mm is cooled to black and waters, and spoken parts in traditional operas width 2-3mm, top depression are obvious, and the absorptivity of Mg is high.
Claims (8)
1. one kind about producing the nodulizing process of spheroidal graphite cast-iron, the first of its feature is nodulizer, 1., without the whole rare earth ferrosilicomagnesium nodulizer (8) of outer lining steel pipe its nodulizer comprises three kinds of specifications:, the percentage by weight that it is characterized in that the contained element that will melt is: containing Mg≤20%, be poured in the model that is its four sides, interval by cooling iron containing Si≤70% with containing the whole rare earth ferrosilicomagnesium inoculant alloy liquid of RE≤3%, until aluminium alloy, solidify, just obtained after cooling the whole rare earth ferrosilicomagnesium nodulizer (8) without the outer lining steel pipe of required weight; 2., low-silicon nodulizer, it is characterized in that the percentage by weight contained at the inner various elements of outer lining rectangular steel tube is as follows, magnesium elements is to take the mode that silicon content is 10～20% surpluses mg-si master alloy powder that is magnesium to add, its addition is 12～15%, in the outer lining rectangular steel tube, total silicon content is 15～25%, containing Ca1～2%, containing RE0.5～1%, surplus be Fe pulverulent material and the rare earth ferrosilicon alloy of magnesium content≤5% divide and be laminated into, make the Integral ball agent; The material be pressed in its outer lining rectangular steel tube is: silicon content is the mg-si master alloy that 10～20% surpluses are magnesium, its granularity is less than 1mm, silicon content is at 50～60% ferrosilicon powder, its granularity is less than 1mm, calcium content is wherein brought into the calcium content in ferrosilicon or is added in the mode of calcium-silicon, its granularity is less than 1mm, and rare earth composition adds in the mode of the rare earth magnesium ferrosilicon alloy of magnesium content≤5%, and its granularity is less than 15mm; Its preparation method is by the silicon content of required total amount 50% in the outer lining rectangular steel tube, to be first that mechanical mixture is even in proportion for 10～20% surpluses be magnesium mg-si master alloy powder, ferrosilicon powder and iron powder, the employing forcing press is the end at the outer lining rectangular steel tube by its compacting, by in the middle of the rare earth magnesium ferrosilicon alloy that is less than 5%Mg content is placed on, then mg-si master alloy powder, ferrosilicon powder and iron powder compound that other 50% the silicon content that mixes is 10～20% are packed in the outer lining rectangular steel tube and be compacted into the identical plane of same outer lining rectangular steel tube length with forcing press; 3., without Si nodularizer, it is characterized in that cuboid metal MAG block is placed in the outer lining rectangular steel tube of both ends open, between cuboid metal MAG block and outer lining rectangular steel tube, by the refractory material of consolidation, isolated; The second portion of its feature is to have built left vertical plane baffle plate (2) and right vertical plane baffle plate (3) by laying bricks or stones in the bottom of spheroidising bag (1), in the top level of left vertical plane baffle plate (2) and right vertical plane baffle plate (3), has built semicircle shape reative cell upper cover plate (4) by laying bricks or stones; Vertical plane at reative cell is provided with one or more reative cell charge doors (5), the opening direction of reative cell charge door (5) is in the face of the position at nodularization bag bag mouth (7) place, the upper end of a reative cell charge door (5) offers relief groove (6) therein, the upper end of relief groove (6) is concordant with semicircle shape reative cell upper cover plate (4), and the outer vertical of left vertical plane baffle plate (2) and right vertical plane baffle plate (3) is concordant with the vertical plane of semicircle shape reative cell upper cover plate (4); After the spheroidising bag (1) that constructs is dried for spheroidising;
Utilize the reaction chamber structure of above-mentioned spheroidising bag (1), select as required the nodulizer of above-mentioned suitable kind, its spheroidising step is as follows:
A, by the whole rare earth ferrosilicomagnesium nodulizer (8) without the outer lining steel pipe of required weight or low-silicon nodulizer or put into without Si nodularizer in the reative cell of spheroidising bag (1);
B, the ferrosilicon inovulant is placed in the reative cell of spheroidising bag (1), the ferrosilicon inovulant is deposited in reative cell charge door place;
C, molten iron pour spheroidising bag (1) and carry out spheroidizing reacion;
D, spheroidizing reacion scratch clean scum silica frost after finishing, and adopt and add the composite inoculant that processed weight of molten iron 0.1% granularity≤5mm composition is Mg3～6%, RE1～2%, Si40～50% to cover molten iron.
2. nodulizing process according to claim 1, it is characterized in that adopting the Antaciron liquid One-step production rare earth ferrosilicomagnesium inoculant alloy liquid of mine heat furnace smelting or mode that electric furnace secondary remelting method is produced rare earth ferrosilicomagnesium inoculant alloy liquid to produce above-mentioned specification 1. without the whole rare earth ferrosilicomagnesium nodulizer (8) of outer lining steel pipe, rare earth ferrosilicomagnesium inoculant alloy liquid is poured in the model that is its four sides, interval by cooling iron, until aluminium alloy, solidifies, just obtained after cooling the whole rare earth ferrosilicomagnesium nodulizer (8) without the outer lining steel pipe of required weight; Be provided with inoculant alloy liquid upper cover plate above model, when rare earth ferrosilicomagnesium inoculant alloy liquid is poured into a mould, effectively limited the exposed area of rare earth ferrosilicomagnesium inoculant alloy liquid upper surface, after pouring, with the upper cover foundary weight, the rare earth ferrosilicomagnesium inoculant alloy fluid-tight exposed is closed, rare earth ferrosilicomagnesium inoculant alloy liquid is rapid cooled and solidified under closed state, has reduced the Segregation of Chemical Composition of nodulizer.
3. nodulizing process according to claim 1 and 2, it is characterized in that utilizing the outer lining rectangular steel tube, the rare earth ferrosilicomagnesium of lanthanum cerium mischmetal metal or ree content≤50% is placed on to the middle part of outer lining rectangular steel tube, the mg-si master alloy pruinescence forcing press compacting at outer lining rectangular steel tube two ends, selection is placed on the rare earth ferrosilicomagnesium of lanthanum cerium mischmetal metal or ree content≤50% at the middle part of outer lining rectangular steel tube, the mode of the mg-si master alloy pruinescence forcing press compacting at outer lining rectangular steel tube two ends adds rare earth element in reative cell, and cooperation will be without the outer lining steel pipe, without the RE composition containing Mg≤20%, add in reative cell and carry out spheroidising containing the magnesium ferrosilicon nodulizer of Si≤70%, molten iron pours the reative cell of nodularization bag, after spheroidizing reacion starts, finally being less than in reaction time of 50% of whole spheroidizing reacion process, lanthanum cerium mischmetal metal in the outer lining rectangular steel tube or the rare earth magnesium ferrosilicon alloy of ree content≤50% start to participate in spheroidizing reacion, effectively supplement required ree content.
4. nodulizing process according to claim 1 and 2, it is characterized in that with without the outer lining steel pipe, without the RE composition containing Mg≤20%, containing the magnesium ferrosilicon nodulizer displacement of Si≤70%, without the whole rare earth ferrosilicomagnesium nodulizer (8) of outer lining steel pipe, carry out spheroidising.
5. method is advanced in nodularization place according to claim 1, the d, the cancellation spheroidizing reacion that it is characterized in that changing in its spheroidising step scratch clean scum silica frost after finishing, employing adds the content of the composite inoculant covering molten iron that weight 0.1% granularity≤5mm composition is Mg3～6%, RE1～2%, Si40～50%, and d, the spheroidizing reacion changed in the spheroidising step scratch clean scum silica frost after finishing.
6. nodulizing process according to claim 1, it is characterized in that the left vertical plane baffle plate (2) of spheroidising bag (1) reative cell, right vertical plane baffle plate (3) and semicircle shape reative cell upper cover plate (4) are merged into a single whole and be processed into the refractory brick of required geomery, or left vertical plane baffle plate (2), right vertical plane baffle plate (3) and semicircle shape reative cell upper cover plate (4) are manufactured respectively to the refractory brick of required geomery; Select the refractory material of clay brick or high silica brick or high magnesia brick to make the assembly of left vertical plane baffle plate (2), right vertical plane baffle plate (3) and semicircle shape reative cell upper cover plate (4), or select the refractory material of clay brick or high silica brick or high magnesia brick to make respectively left vertical plane baffle plate (2), right vertical plane baffle plate (3) and semicircle shape reative cell upper cover plate (4).
7. nodulizing process according to claim 1, it is characterized in that producing above-mentioned specification 2. the RE content of the rare earth magnesium ferrosilicon alloy of the magnesium content in the outer lining rectangular steel tube of low-silicon nodulizer≤5% be 15～50%.
8. nodulizing process according to claim 1, it is characterized in that producing above-mentioned specification 2. low-silicon nodulizer adopt each independently the nodulizer in the outer lining rectangular steel tube carry out again the mechanical uniform mixing after batching separately, adopt 100 tons or 360 tons of forcing press compactings in batches after mixing.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862004A (en) * | 2013-09-06 | 2014-06-18 | 天津市万路科技有限公司 | Molten iron treatment method |
| CN104004959A (en) * | 2014-05-23 | 2014-08-27 | 东营恒诚机械有限公司 | Method for treating ductile cast iron foundry returns by applying non-silicone nodulizing agent in ductile cast iron smelting |
| CN104513879A (en) * | 2015-01-01 | 2015-04-15 | 天津市万路科技有限公司 | Method for treating molten iron |
| CN108746572A (en) * | 2018-07-02 | 2018-11-06 | 西峡县众德汽车部件有限公司 | Casting packet and casting method |
| CN109852757A (en) * | 2019-02-22 | 2019-06-07 | 青阳县光大铸造有限公司 | A method of spheroidal graphite cast-iron is produced using granular nodulizer |
| CN114438274A (en) * | 2022-02-21 | 2022-05-06 | 内蒙古圣泉科利源新材料科技有限公司 | Production method of special high-silicon nodulizer for large castings |
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2013
- 2013-09-06 CN CN2013104013858A patent/CN103433471A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862004A (en) * | 2013-09-06 | 2014-06-18 | 天津市万路科技有限公司 | Molten iron treatment method |
| CN104004959A (en) * | 2014-05-23 | 2014-08-27 | 东营恒诚机械有限公司 | Method for treating ductile cast iron foundry returns by applying non-silicone nodulizing agent in ductile cast iron smelting |
| CN104513879A (en) * | 2015-01-01 | 2015-04-15 | 天津市万路科技有限公司 | Method for treating molten iron |
| CN108746572A (en) * | 2018-07-02 | 2018-11-06 | 西峡县众德汽车部件有限公司 | Casting packet and casting method |
| CN109852757A (en) * | 2019-02-22 | 2019-06-07 | 青阳县光大铸造有限公司 | A method of spheroidal graphite cast-iron is produced using granular nodulizer |
| CN114438274A (en) * | 2022-02-21 | 2022-05-06 | 内蒙古圣泉科利源新材料科技有限公司 | Production method of special high-silicon nodulizer for large castings |
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Application publication date: 20131211 |