CN103008617A - Method for preparing high-speed steel composite roll for hot rolling - Google Patents
Method for preparing high-speed steel composite roll for hot rolling Download PDFInfo
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- CN103008617A CN103008617A CN2012105772061A CN201210577206A CN103008617A CN 103008617 A CN103008617 A CN 103008617A CN 2012105772061 A CN2012105772061 A CN 2012105772061A CN 201210577206 A CN201210577206 A CN 201210577206A CN 103008617 A CN103008617 A CN 103008617A
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Abstract
The invention discloses a method for preparing a high-speed steel composite roll for hot rolling. The method is characterized by comprising the following steps of: firstly, manufacturing a regenerated high-speed steel composite roll collar by adopting an electroslag hollow stripping method; melting low-cost nodular cast iron or plain carbon steel by utilizing an intermediate frequency furnace or an electric arc furnace; manufacturing a roll core by a casting method; and fusing the roll outer collar and the roll core together in the manner of casting to prepare the composite roll for the hot rolling, wherein the working roll collar of the composite roll for the hot rolling is made of high-speed steel, and the roll core is made of the nodular cast iron or the plain carbon steel. The high-speed steel composite roll prepared by the method disclosed by the invention has the characteristics that the outer layer thickness is even, the tissue is fine and compact, and the nodular cast iron or the plain carbon steel is adopted to serve as the material of the roll core. The quality of the working face of the roll is comprehensively improved by utilizing the dual action of rare earth treatment and electroslag refining during a process of manufacturing the roll collar, and the service life is long. A roll body and the roll core are respectively made of the nodular cast iron or plain carbon steel, so that the integrated cost is low. The method disclosed by the invention is suitable for manufacturing the high-speed steel composite roll for the hot rolling and can be widely applied in metallurgical industry and renewable resource industry.
Description
Technical field
The present invention relates to the preparation method of the compound roll for hot-rolling of a kind of high-speed steel, belong to the metal material technical field.
Background technology
The trend of the roll material development of recent researches is to be widely used alloying element and to improve gradually alloying level, and the roll barrel surface forms more harder carbide, improves the wearability of roll.High-speed steel is used to the manufacturing of roll because having hardness height, the red hardness good characteristics that reach wearability well.Make the method that compound high speed steel roll mainly contains forging and centrifugal casting.Adopt forging method, be prone to crackle in the forging process, forge high-speed steel roll and also have the deficiencies such as lumber recovery is low, energy consumption is high and processing capacity is large, technological process is long.Adopting centre spinning method to make high-speed steel roll subject matter is WC, VC segregation and crackle, when molten steel falls to flowing the casting mold of impact high speed rotation in addition, might make the dope layer cracking of mo(U)ld face even peel off, coating after peeling off enters roll inside with molten steel, during the coating cracking, molten steel pierces crackle surface coating material is clipped in the middle, and causes roll the top layer to occur and is mingled with.
Summary of the invention
The objective of the invention is, make the problem that compound high speed steel roll exists according to conventional method (as forging and centre spinning method), the present invention discloses the preparation method of the compound roll for hot-rolling of a kind of high-speed steel.
Technical scheme of the present invention is, the present invention adopts the hollow stripping method of electroslag to make first regeneration compound high speed steel roll collars, utilize the fusing of intermediate frequency furnace or the electric arc furnaces spheroidal graphite cast-iron that cost is low or straight carbon steel, make the roll roller core in the casting mode, simultaneously roll outer shroud and the casting of roll roller core are fused together, thereby the preparation work collars is high-speed steel, and core is the compound roll for hot-rolling of spheroidal graphite cast-iron or straight carbon steel.
Rare earth regeneration compound high speed steel roll of the present invention is to prepare by following steps:
1, high-speed steel consutrode preparation: adopting useless high-speed steel is raw material, requires to add alloy material according to chemical composition, adds rare earth alterative 0.1-0.5%, utilizes electric furnace smelting method, burns casting and obtains the high-speed steel consutrode;
2, continuous stripping fusion cast process: slag charge is through being heated to about 2 hours of 150 ℃-300 ℃ insulations, the gas disposal that dewaters is changed in changing slag hearth, melts the electroslag material and pours in the hollow stripping crystallizer, the high-speed steel consutrode is inserted slag bath carry out conventional electroslag refining, feeding, end.Simultaneously, the suitable for reading and end opening of crystallizer is carried out gas shield to melting finish, obtain high-speed steel roll for hot-rolling building ring;
3, insulation is processed: with the high-speed steel work hot rolling collar of stripping founding, utilize that hot sand carries out covering protection more than 600 ℃, until cool to room temperature;
4, casting compound thermal roll: high-speed steel work hot rolling collar is combined with the shell of casting sand mold, carries out the sand mold joint treatment with fire clay, it is 600 ℃ that the breaker roll ring carries out the pre-heat treatment temperature, fills out 500 ℃ of hot sand protections around collar and the sand mold; Utilize intermediate frequency furnace or electric arc furnaces, burned sand mold after spheroidal graphite cast-iron or straight carbon steel are melted through deoxidation, skim is finished after feeding;
5, insulation shaping: the composite roll blank adopts 500 ℃ of hot sand landfills, removes cast gate, rising head after the cooling;
6, heat treatment and processing: the annealing process of composite roll blank is for being heated to 950 ℃ and be incubated 3 hours, and stove is chilled to 600 ℃, the air cooling of coming out of the stove.Carry out roughing after the annealing.Rolling face carries out the high-frequency quenching processing after the roughing, then finish grindes moulding, finishes the making of the compound roll for hot-rolling of high-speed steel.
The invention has the beneficial effects as follows that the inventive method obtains high-speed steel hot roll working lining by RE-treated and electroslag refining double action, has eliminated netted and large massive carbide; Reduced gas and the impurity content in the material, improved the material cold-heat fatigue behaviour, reduced the hot cracking tendency of material, the working lining case hardness is even, compare with the compound roll for hot-rolling of centrifugal casting quick-cutting steel, it is high to have roll workspace quality, and core is combined the characteristics such as firm with working lining, and be that the roll for preparing of common centre spinning method is more than 2 times service life.
The prepared compound high speed steel roll characteristics of the inventive method are that outer layer thickness is even; Fine microstructures is fine and close; Employing spheroidal graphite cast-iron or the straight carbon steel of core material.In making, the roll collars utilize the double action of RE-treated and electroslag refining to improve rolling face quality, long service life comprehensively; What the body of roll and roller core adopted is that spheroidal graphite cast-iron or straight carbon steel integrated cost are low.
Preparation method of the present invention has the advantage that material property is stable, lumber recovery is high, integrated cost is low.
The present invention is applicable to the manufacturing production of the compound roll for hot-rolling of high-speed steel, can be in metallurgical, recycle business extensive use.
Description of drawings
Fig. 1 is process chart of the present invention;
Fig. 2 is the preparation schematic diagram of high-speed steel work collars of the present invention;
Fig. 3 is that work collars of the present invention is connected compound schematic diagram with roller core;
Picture in picture number is: the 1st, and interior crystallizer; The 2nd, the high-speed steel consutrode; The 3rd, outer crystallizer; The 4th, the electroslag of fusing; The 5th, the rolling face layer collar; The 6th, the interior crystallizer water inlet; The 7th, the interior crystallizer water outlet; The 8th, outer crystallizer water inlet; The 9th, outer crystallizer water outlet; The 11st, water the Casting Roller core; The 12nd, the rolling face layer; The 13rd, sand mold.
The specific embodiment
The specific embodiment of the invention is shown in Fig. 1 process chart.
Implementation divides two steps, the one, utilize electroslag stripping method to prepare the high-speed steel loop type material of the working lining of roll for hot-rolling, working surface layers as roll for hot-rolling, the preparation of the invention process high-speed steel work collars as shown in Figure 2, the rolling face layer collar 5 forms between interior crystallizer 1 and outer crystallizer 3, the 2nd, high-speed steel consutrode, the 4th, the electroslag of fusing, the 6th, interior crystallizer water inlet; The 7th, the interior crystallizer water outlet guarantees the cooling of interior crystallizer; The 8th, outer crystallizer water inlet; The 9th, outer crystallizer water outlet guarantees the cooling of outer crystallizer.
The invention process work collars is connected as shown in Figure 3 compound with roller core.As overcoat, utilize intermediate frequency furnace or electric arc furnaces with spheroidal graphite cast-iron or the rear roller core of straight carbon steel fusing casting and work ring set casting fusion moulding the roll for hot-rolling working face, wherein 11 is to water the Casting Roller core; The 12nd, the rolling face layer; The 13rd, sand mold.
Implementation step: at first, it is the preparation of the working surface layers of roll for hot-rolling, owing to contain more tungsten in the high-speed steel, chromium, molybdenum, the elements such as vanadium, the carbide density contrast of these elements and formation thereof is very large, utilize the method for rare earth alterative processing and electroslag refining, in the comsumable melt process, utilize the double action of RE Modified and wash heat refining, can eliminate net carbide and the carbide segregation of regeneration high speed steel roll collar, non-metallic inclusion and harmful element in the steel are removed in a large number, can obtain simultaneously fine and close tissue, avoid the loose segregation defective that produces in the common metallurgical process, thereby reach the lumber recovery of the working face aspect of the metallurgical quality of working surface layers of the roll for hot-rolling that improves high-speed steel and roll for hot-rolling.
Secondly, the collars of the roll for hot-rolling made is carried out the pre-heat treatment as the work overcoat of casting, engage with the sand mold shell at the collars two ends, form roller core and roll neck cavity, the spheroidal graphite cast-iron that fusing is good or straight carbon steel pour into casts roller core and roll neck in the cavity, slow cooling after the burning casting is finished, finishing blank makes, modifier treatment processing reaches the rolling face hardness requirement through the high-frequency quenching processing, finishes manufacturing behind the correct grinding.
Embodiment 1
(1) working lining consutrode preparation: by the requirement of high-speed steel chemical composition, batching, intermediate frequency furnace is smelted, and adds rare earth alterative 0.5%, and cast obtains the high-speed steel consutrode;
(2) the outer ring forming of working lining: carry out according to electroslag remelting process, slag charge is through being heated to 250 ℃ of insulations 2 hours, gas disposal dewaters, in changing slag hearth, change, fusing electroslag material pours in the hollow stripping crystallizer, the high-speed steel consutrode is inserted slag bath carry out conventional electroslag refining, feeding, end.Simultaneously, the suitable for reading and end opening of crystallizer is carried out gas shield to melting finish, obtain high-speed steel roll for hot-rolling building ring, moulding is finished, and adopts 600 ℃ of hot sand covering and heat insulatings;
(3) moulding connects: high-speed steel work hot rolling collar is combined with the shell of casting sand mold, carries out the sand mold joint treatment with fire clay, heating work roll for hot-rolling ring and sand mold are filled out 500 ℃ of hot sand on every side.
(5) composite molding: utilize intermediate frequency furnace, with spheroidal graphite cast-iron casting fusing, deoxidation, skim after, pour into sand mold, finish feeding after, cast complete after.
(6) insulation shaping: fill out hot sand insulation 4.5 hours, remove to burn mouth, rising head.
(7) heat treatment process: through 940 ℃ of insulations 3.5 hours, stove was chilled to 600 ℃ and comes out of the stove to room temperature.Roughing.High-frequency quenching is processed roll building ring shell, and correct grinding is finished making after the cooling.
Finish at last the making of the compound roll for hot-rolling of high-speed steel.
Working lining Hardness of High Speed Steel: HRC62-66
Working lining carbide rank: less than 3 grades
Embodiment 2
(1) working lining consutrode preparation: by the requirement of high-speed steel chemical composition, batching adds rare earth alterative 0.3%, and intermediate frequency furnace is smelted and obtained the high-speed steel consutrode;
(2) the outer ring forming of working lining: carry out according to electroslag remelting process, slag charge through being heated to 250 ℃ 2 hours, gas disposal dewaters, in changing slag hearth, change, fusing electroslag material pours in the hollow stripping crystallizer, the high-speed steel consutrode is inserted slag bath carry out conventional electroslag refining, feeding, end.Simultaneously, the suitable for reading and end opening of crystallizer is carried out gas shield to melting finish, obtain high-speed steel roll for hot-rolling building ring, moulding is finished, and adopts 600 ℃ of hot sand covering and heat insulatings;
(3) moulding connects: high-speed steel work hot rolling collar is combined with the shell of casting sand mold, carries out the sand mold joint treatment with fire clay, heating work roll for hot-rolling ring and sand mold are filled out 500 ℃ in hot sand on every side.
(5) composite molding: utilize electric arc furnaces, with straight carbon steel casting fusing, deoxidation, skim after, pour into sand mold, finish feeding after, cast complete after.
(6) insulation shaping: fill out hot sand insulation 4.5 hours, remove to burn mouth, rising head.
(7) heat treatment process: through 780 ℃ of insulations 3.4 hours, stove was chilled to 630 ℃ and comes out of the stove to room temperature.Roughing.High-frequency quenching is processed roll building ring shell, and correct grinding is finished making after the cooling.
Finish at last the making of the compound roll for hot-rolling of high-speed steel.
Working lining Hardness of High Speed Steel: HRC62-66;
Working lining carbide rank: less than 3 grades.
Claims (2)
1. the preparation method of the compound roll for hot-rolling of high-speed steel, it is characterized in that, described method adopts the hollow stripping method of electroslag to make first regeneration compound high speed steel roll collars, then utilize the fusing of intermediate frequency furnace or the electric arc furnaces spheroidal graphite cast-iron that cost is low or straight carbon steel, make the roll roller core in the casting mode, simultaneously roll outer shroud and the casting of roll roller core are fused together, thereby the preparation work collars is high-speed steel that core is the compound roll for hot-rolling of spheroidal graphite cast-iron or straight carbon steel;
Rare earth regeneration compound high speed steel roll of the present invention is to prepare by following steps:
(1) high-speed steel consutrode preparation: adopting useless high-speed steel is raw material, requires to add alloy material according to chemical composition, adds rare earth alterative 0.01-0.05%, utilizes electric furnace smelting method, burns casting and obtains the high-speed steel consutrode;
(2) continuous stripping fusion cast process: slag charge is through being heated to 150 ℃-300 ℃, being incubated about 2 hours, the gas disposal that dewaters is changed in changing slag hearth, melts the electroslag material and pours in the hollow stripping crystallizer, the high-speed steel consutrode is inserted slag bath carry out conventional electroslag refining, feeding, end;
(3) insulation is processed: with the high-speed steel work hot rolling collar of stripping founding, utilize that hot sand carries out covering protection more than 600 ℃, until cool to room temperature;
(4) casting compound thermal roll: high-speed steel work hot rolling collar is combined with the shell of casting sand mold, carries out the sand mold joint treatment with fire clay, it is 600 ℃ that the breaker roll ring carries out the pre-heat treatment temperature, fills out 500 ℃ of hot sand protections around collar and the sand mold; Utilize intermediate frequency furnace or electric arc furnaces, burned sand mold after spheroidal graphite cast-iron or straight carbon steel are melted through deoxidation, skim is finished after feeding;
(5) insulation shaping: the composite roll blank adopts 500 ℃ of hot sand landfills, removes cast gate, rising head after the cooling;
(6) heat treatment and processing: the annealing process of composite roll blank is for being heated to 950 ℃ and be incubated more than 3 hours, and stove is chilled to 600 ℃, the air cooling of coming out of the stove; Carry out roughing after the annealing; Rolling face carries out the high-frequency quenching processing after the roughing, then finish grindes moulding, finishes the making of the compound roll for hot-rolling of high-speed steel.
2. the preparation method of the compound roll for hot-rolling of a kind of high-speed steel according to claim 1; it is characterized in that; described continuous stripping fusion cast process step is carried out gas shield to melting to the suitable for reading and end opening of crystallizer simultaneously and is finished, and obtains high-speed steel roll for hot-rolling building ring.
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| CN201210577206.1A CN103008617B (en) | 2012-12-27 | 2012-12-27 | Method for preparing high-speed steel composite roll for hot rolling |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048400A (en) * | 2016-02-23 | 2016-10-26 | 江苏盈科汽车空调有限公司 | Nodular cast iron used for air conditioner compressor cylinder and preparing method of nodular cast iron |
| CN106140819A (en) * | 2016-08-31 | 2016-11-23 | 唐山亿联盛轧辊有限公司 | A kind of compound high speed steel roll and production method thereof |
| CN109513902A (en) * | 2018-11-28 | 2019-03-26 | 湖南四昉新材料有限公司 | A kind of processing method, processing unit (plant) and the bimetal roller set of bimetal roller set |
| CN113118419A (en) * | 2021-04-14 | 2021-07-16 | 朱龙华 | Process for manufacturing metal roller with gradient composite layer by electroslag remelting compounding |
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| CN102069174A (en) * | 2009-11-24 | 2011-05-25 | 铜陵市大明玛钢有限责任公司 | Method for producing centrifugal electroslag smelting and casting double-base composite roller |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048400A (en) * | 2016-02-23 | 2016-10-26 | 江苏盈科汽车空调有限公司 | Nodular cast iron used for air conditioner compressor cylinder and preparing method of nodular cast iron |
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| CN106140819A (en) * | 2016-08-31 | 2016-11-23 | 唐山亿联盛轧辊有限公司 | A kind of compound high speed steel roll and production method thereof |
| CN109513902A (en) * | 2018-11-28 | 2019-03-26 | 湖南四昉新材料有限公司 | A kind of processing method, processing unit (plant) and the bimetal roller set of bimetal roller set |
| CN113118419A (en) * | 2021-04-14 | 2021-07-16 | 朱龙华 | Process for manufacturing metal roller with gradient composite layer by electroslag remelting compounding |
| CN113118419B (en) * | 2021-04-14 | 2022-07-29 | 朱龙华 | Process for manufacturing gradient composite layer metal roller by electroslag remelting compounding (re) |
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