CN101653779B - Effective hot rolled steel strip production process EHSP and method thereof - Google Patents
Effective hot rolled steel strip production process EHSP and method thereof Download PDFInfo
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- CN101653779B CN101653779B CN2008100701449A CN200810070144A CN101653779B CN 101653779 B CN101653779 B CN 101653779B CN 2008100701449 A CN2008100701449 A CN 2008100701449A CN 200810070144 A CN200810070144 A CN 200810070144A CN 101653779 B CN101653779 B CN 101653779B
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Abstract
The invention belongs to the field of forming technology, in particular relates to an effective hot rolled steel strip process EHSP and a method thereof. A first-class conventional continuous casting (200-230mm) plate blank and a second-class thin plate blank of a thickness of 70/55mm are combined to form a production process route of a set of continuous-casting and tandem-rolling production line. The hot rolled steel strip process is characterized by the thin slab continuous-casting and tandem-rolling production process characteristics as well as wide range, high surface quality and good post machining properties of conventional hot tandem-rolling products, and has a whole-line production capacity up to 3.5 millions t/a. The effective hot rolled steel strip process is smooth and compact in process flows, simple and reasonable in the equipment configuration, high in the production efficiency, good in the product quality and high in the added value of the products, and can be applied to the construction of a newly made or improved continuous-casting and tandem-rolling hot rolled steel strip mills.
Description
Technical field
The invention belongs to field shaping technique, relate to the process that broad hot strip is produced in a kind of continuous casting and rolling, particularly a kind of hot-strip production technology-EHSP (
EFfective
Hot STrip
PRocess) and method.
Background technology
Since thin plate blank continuously casting and continuously rolling technology comes out, through years of development, now mainly contain the German SMS CSP of company, the Italy Danieli FTSR of company, Italy Danieli company casting machine adds the DSP that the Mitsubishi milling train combines, technology such as SUMITOMO CHEMICAL metal company QSP, simple continuous casting and rolling technique of sheet bar subject matter is the too thin cold rolling feeds difficulty that causes that product surface quality is not high and the high confession of yield tensile ratio is high-grade of slab thickness, its production line can only dispose 2 stream casters simultaneously, production capacity is about 2,400,000 tons, and the efficient of roll line is not fully exerted.
There are two significantly deficiencies in the continuous casting and rolling production line that has now used: the first can only adopt two stream casters, and maximum production is ten thousand t about 240, and the production capacity of rolling line can not be given full play to; It two is products of producing because the defective of technology itself, and the kind of production is single, be difficult to provide cold rolling feeds.So far in the world all sheet billet continuous casting and rolling production lines all rolling first-class or two stream sheet billets, still be not used in precedent thick, the sheet billet combinations produce,
Summary of the invention
The objective of the invention is to propose a kind of hot-strip production technology-EHSP and method.(200～230mm) slab, 2 flow the thick sheet billet of 70/55mm, are combined into the production process route of a cover continuous casting continuous rolling production line to adopt the conventional continuous casting of 1 stream.The present invention had both had the production technology characteristic of CSP, had the characteristics that the conventional hot continuous rolling machine product scope is wide, surface quality is high, the product properties for follow is good again, and production capacity can be up to 3,500,000 t/a completely.
It adopts the conventional continuous casting of 1 stream (200～230mm) slab, realize the heating and the buffering of slab by walking beam heating furnace, behind high-pressure water descaling, adopt powerful, the round middle made-up belt that is rolled into 70mm of reversing rougher at a high speed, enter can be traversing roller hearth furnace, gather doubling according to rolling joint again and enter 7 frame tandem rolling units and be rolled into the finished product coil of strip; Adopt the thick sheet billet of 2 stream 70/55mm, realize the heating and the buffering of slab by roller hearth type heating furnace, enter can be traversing roller hearth furnace, gather doubling according to rolling joint again and enter 7 frame tandem rolling units and be rolled into the finished product coil of strip.
This method adopts two stream 70 and the thick continuous casting billets of 55mm, cut into the strand of the longest 42m through swinging shears, two stream sheet billets are heated to 1050 ℃～1180 ℃ through two bench roller bottom-type heating furnaces with board briquette respectively, but then with stove at the bottom of the cross sliding type roller and flow to into continuous rolling production line, through being rolled into the intermediate blank of 25mm-40mm behind the high-pressure water descaling by two unidirectional type tandem roughing mills, being rolled into the thick hot-strip of 1.0～12.7mm and batching through 5 finishing mills then through cooling facility for laminar flow cooling, coiling machine through crop end, high-pressure water descaling; The 3rd stream caster machine is produced the thick conventional continuous casting billet of 210mm, go out blank roller way and go into the furnace roller road to send into walking beam furnace through conventional conticaster, board briquette is come out of the stove after being heated to 1100 ℃～1250 ℃, through high-pressure water descaling, enter four roller reversible roughing mills and come and go and to be rolled into the thick intermediate blank of 70mm, be rolled into coils of hot-rolled steel but enter at the bottom of the cross sliding type roller behind the stove again and flow to into aforementioned same 7 frame continuous rolling production line.
This method is owing to adopted conticaster thick, thin combination, and realized that three stream doublings are rolling, improved the production capacity of continuous casting and rolling significantly, the yearly productive capacity of whole production line can reach 350～4,000,000 tons, has given full play of the High-efficient Production ability of roll line; (200～230mm) slab has improved slab surface quality to the conventional continuous casting of the 3rd stream employing simultaneously, can produce than existing continuous casting and rolling technique of sheet bar product quality and require higher product and high-grade cooling to roll the raw material coil of strip, product broad covered area, added value height, surface quality are good; Two streams are typical CSP in addition, can give full play of the advantage of short flow process, nearly end form rolling mill practice and produce thin brilliant, high-strength, ultrathin strip, also can utilize the advantage constant temperature that temperature special, rolled piece is even, deformation condition is good of CSP strand as-cast structure, the silicon steel product that the constant speed rolling added value is high, the crystallization again of final hot rolled silicon steel sheet in coil is very abundant, and the magnetic strength value is significantly improved.
The great task of current Chinese national economy structural adjustment is autonomous innovation, and saving energy, lowering energy consumption and reducing pollutants discharge are built a resource-conserving society.The continuous casting and rolling technology artistic skill reduces fuel consumption by a relatively large margin, the discharging of metal consumption and flue gas, meet country about energy-conservation, consumption reduction, the development general orientation that reduces discharging, therefore, create a kind of novel continuous casting and rolling process for production and apply to broad hot strip production, can overcome CSP yields poorly, surface difference, the deficiency that the product properties for follow is weak, can give full play of the CSP saving energy, lowering energy consumption and reducing pollutants discharge again, produce the traditional advantage of thin brilliant high-strength thin slab product and silicon steel production aspect, inject new great vitality for the CSP of having built or having planned to build China's steel and iron industry development is had great significance.The present invention increases first-class heavy slab roughing line in 2 stream sheet billet continuous casting and rolling production lines, the doubling rolling technique of realizing three stream strands simultaneously is world's initiative.
The included content of the present invention is:
Adopt the conventional continuous casting of 1 stream (200～230mm) slab, realize the heating and the buffering of slab by walking beam heating furnace, behind high-pressure water descaling, adopt the brute force four roller reversible roughing mills of band edger roll to come and go the middle made-up belt that is rolled into 70mm, enter can be traversing roller hearth furnace, gather doubling according to rolling joint again and enter 7 frame tandem rolling units and be rolled into the finished product coil of strip;
Adopt the thick sheet billet of 2 stream 70/55mm, realize the heating and the buffering of slab by roller hearth type heating furnace, enter can be traversing roller hearth furnace, gather doubling according to rolling joint again and enter 7 frame tandem rolling units and be rolled into the finished product coil of strip;
The 3 stream strand doublings that the present invention has realized is thick, thin continuous casting steel billet combines are rolling, also realized the rational division of work that the product of different cultivars, specification, purposes adopts different continuous casting steel billets to produce, improve the production capacity of continuous casting and rolling production line greatly, also given full play of the rolling power of tandem rolling unit.Both had the production technology characteristic of CSP, had the characteristics that the conventional hot continuous rolling machine product scope is wide, surface quality is high, the product properties for follow is good again.
Technological process of the present invention is smooth and easy, compact, and it is simple, reasonable that equipment is formed, production efficiency height, good product quality, added value height.
Description of drawings
Accompanying drawing is an EHSP Processes and apparatus configuration plane schematic diagram
Among the figure: part 1 is a conticaster, and part 2 is a swinging shears, and part 3 is the high-pressure water descaling case, and part 4 is two R1 and R2 four roller unidirectional type roughing mills, and part 5 is a crop flying shear, and part 6 is a quickly cooling device, and part 7 is the high pressure descaling case, and part 8 is F
1-F
5Mm finishing mill unit, part 9 is a cooling facility for laminar flow, and part 10 is two downcoilers, and part 11 is a walking beam heating furnace, and part 12 is the high pressure descaling case, part 13 is one four a roller reversible roughing mill.
The specific embodiment
In conjunction with the accompanying drawings the present invention is specified:
Qualified molten steel becomes the continuous casting steel billet of 70-90mm and is pressed down to 55-70mm through the liquid core by conticaster 1 casting.According to the steel grade difference, pull out slab by the slab that conticaster 1 goes out with different casting speeds, when strand length reaches the length (max.42000mm) of setting, cut by swinging shears 2, strand after the shearing carries out raising speed immediately and delivers in the roller hearth type heating furnace and heat, reach the slab of setting after the tapping temperature (1050-1180 ℃) and enter high-pressure water descaling case 3 usefulness water under high pressures and remove the iron scale that generates in the heating process, send into two R1 and R2 four roller unidirectional type roughing mills 4 then.Slab is through two R1 (band edger roll) and the R2 four roller unidirectional type roughing mills 4 rolling middle made-up belts that become the 20-40mm left and right thickness.Edger roll is rolling can accurately control strip width and raising, improve strip edge portion quality.Middle made-up belt enter subsequently crop flying shear 5 excisions irregular end to end after, enter quickly cooling device 6 for the band steel that needs ferrite rolling and cool off fast; For the then empty quickly cooling device 6 of crossing of the band steel that does not carry out ferrite rolling, be with steel to enter then and send into F after high pressure descaling case 7 usefulness water under high pressures are removed iron scale
1-F
5Mm finishing mill unit 8 is rolling, through F
1-F
5Band steel finished product thickness reaches 1.0-12.7mm behind mm finishing mill unit 8 tandem rollings.Finished strip carries out the laminar flow cooling through cooling facility for laminar flow 9, will be with steel to be cooled to batch through two downcoilers 10 behind the target temperature; Walking beam heating furnace 11 is a walking beam reheating furnace, can (200～230mm) slab heats to conventional continuous casting, come out of the stove after reaching design temperature, enter high pressure descaling case 12 usefulness water under high pressures then and remove the iron scale that generates in the heating process, enter the thick middle made-up belt of one four roller reversible roughing mill, the 13 reciprocal rolling 70mm of becoming subsequently and enter stove soaking at the bottom of the cross sliding type roller, insulation, and gather according to the rolling joints of 2 stream sheet billets and to incorporate 7 frame tandem rolling lines in rolling gap and be rolled, it is same as above to enter the later technological process of high-pressure water descaling case 3.
The product of the reasonable distribution of thick, thin casting machine production capacity that the present invention has realized and different cultivars, specification, purposes adopts the rational division of work of different continuous casting steel billets productions, has improved the production capacity of continuous casting and rolling production line greatly.Thick continuous casting billet has improved slab surface quality, can produce than existing continuous casting and rolling technique of sheet bar product quality to require higher product and high-grade cooling to roll the raw material coil of strip, and product broad covered area, added value height, surface quality are good; Two streams give full play of thin brilliant, high-strength, the ultrathin strip of advantage production of the short flow process of CSP, nearly end form rolling mill practice in addition, also can utilize the advantage constant temperature that temperature special, rolled piece is even, deformation condition is good, the constant speed rolling silicon steel product that crystallization fully again, the magnetic strength value is high of CSP strand as-cast structure.
Technological process of the present invention is smooth and easy, compact, and it is simple, reasonable that equipment is formed, the production efficiency height, and good product quality, added value height can be widely used in the hot-strip production.
Claims (3)
1. hot-strip production technology-EHSP is characterized in that: adopt the slab of the conventional continuous casting 200mm-230mm of 1 stream, 2 stream 70mm or the thick sheet billets of 55mm are combined into the production process route of a cover continuous casting continuous rolling production line; Wherein 1 stream conventional continuous casting 200mm-230mm slab, realize the heating and the buffering of slab by walking beam heating furnace, behind high-pressure water descaling, adopt powerful, the round middle made-up belt that is rolled into 70mm of reversing rougher at a high speed, enter can be traversing roller hearth furnace, doubling enters 7 frame tandem rolling units and is rolled into the finished product coil of strip according to rolling rhythm again; 2 stream 70mm or the thick sheet billets of 55mm are realized the heating and the buffering of slab by roller hearth type heating furnace, enter can be traversing roller hearth furnace, doubling enters 7 frame tandem rolling units and is rolled into the finished product coil of strip according to rolling rhythm again.
2. hot-strip production technology-EHSP according to claim 1, it is characterized in that: this method adopts 2 stream 70mm or the thick sheet billets of 55mm, cut into the strand of the longest 42m through swinging shears, two stream sheet billets are heated to 1050 ℃～1180 ℃ through two bench roller bottom-type heating furnaces with board briquette respectively, but then with stove at the bottom of the cross sliding type roller and flow to into continuous rolling production line, through be rolled into the intermediate blank of 25mm-40mm behind the high-pressure water descaling by two unidirectional type tandem roughing mills, through crop end, high-pressure water descaling is rolled into the thick hot-strip of 1.0mm～12.7mm and cools off through cooling facility for laminar flow through 5 finishing mills then, coiling machine batches; The 3rd stream caster machine is produced the thick conventional continuous casting billet of 210mm, go out blank roller way and go into the furnace roller road to send into walking beam furnace through conventional conticaster, board briquette is come out of the stove after being heated to 1100 ℃～1250 ℃, through high-pressure water descaling, enter four roller reversible roughing mills and come and go and to be rolled into the thick intermediate blank of 70mm, be rolled into coils of hot-rolled steel but enter at the bottom of the cross sliding type roller behind the stove again and flow to into aforementioned same 7 frame tandem rolling unit.
3. hot-strip production technology-EHSP according to claim 1 and 2 is characterized in that: the rolling process system of three stream doublings, and the opportunity of incorporating continuous rolling production line after the heavy slab roughing into:
A.2 flow the thick thin sheet continuous casting machine of 70mm or 55mm and stop the time of watering;
B.2 flow the thick thin sheet continuous casting machine of 70mm or 55mm and begin to be poured into the filling time of slab between being filled to before traversing section of the roller hearth furnace;
When c.2 flowing the thick thin sheet continuous casting machine ordinary production of 70mm or 55mm, the conticaster sheet billet of casting that utilization is low because of the continuous casting pulling rate, casting time length produces and the time difference of a rolling sheet billet, roll fast at the bottom of the sky roller and stockpile slab in the stove, the intermediate blank doubling that time difference of accumulation is used for after the heavy slab roughing is rolling, promptly realize thick, sheet billet tandem rolling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100701449A CN101653779B (en) | 2008-08-20 | 2008-08-20 | Effective hot rolled steel strip production process EHSP and method thereof |
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| CN2008100701449A CN101653779B (en) | 2008-08-20 | 2008-08-20 | Effective hot rolled steel strip production process EHSP and method thereof |
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| CN101653779B true CN101653779B (en) | 2011-06-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172830B (en) * | 2011-01-06 | 2013-05-08 | 中冶东方工程技术有限公司 | Compound production line system |
| CN103341497B (en) * | 2013-05-28 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Downcoiler is wanted steel system fast and is wanted steel method fast |
| KR102467210B1 (en) * | 2018-10-31 | 2022-11-16 | 닛폰세이테츠 가부시키가이샤 | Control system, control method, control device, and program |
| IT201800010870A1 (en) * | 2018-12-06 | 2020-06-06 | Danieli Off Mecc | APPARATUS AND METHOD OF PRODUCTION OF TAPES |
| DE102020205077A1 (en) * | 2019-09-23 | 2021-03-25 | Sms Group Gmbh | Device and method for the production and further treatment of slabs |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1128182A (en) * | 1994-01-10 | 1996-08-07 | 梯品斯股份有限公司 | Intermediate thickness twin slab caster and inline hot strip and plate line |
| JP2003260511A (en) * | 2002-03-12 | 2003-09-16 | Sanyo Special Steel Co Ltd | Method for manufacturing wire rod |
| DE10304318A1 (en) * | 2003-02-04 | 2004-08-12 | Sms Demag Ag | Process for rolling thin and / or thick steel material slabs into hot strip |
-
2008
- 2008-08-20 CN CN2008100701449A patent/CN101653779B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1128182A (en) * | 1994-01-10 | 1996-08-07 | 梯品斯股份有限公司 | Intermediate thickness twin slab caster and inline hot strip and plate line |
| JP2003260511A (en) * | 2002-03-12 | 2003-09-16 | Sanyo Special Steel Co Ltd | Method for manufacturing wire rod |
| DE10304318A1 (en) * | 2003-02-04 | 2004-08-12 | Sms Demag Ag | Process for rolling thin and / or thick steel material slabs into hot strip |
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