CN101871037B - Method for producing light oxidation annealed plate on continuous annealing production line - Google Patents
Method for producing light oxidation annealed plate on continuous annealing production line Download PDFInfo
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- CN101871037B CN101871037B CN2010101950060A CN201010195006A CN101871037B CN 101871037 B CN101871037 B CN 101871037B CN 2010101950060 A CN2010101950060 A CN 2010101950060A CN 201010195006 A CN201010195006 A CN 201010195006A CN 101871037 B CN101871037 B CN 101871037B
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Abstract
A method for producing a light oxidation annealed plate on a continuous annealing production line belongs to the technical field of metallurgical plate production and is used for solving the problem of producing the light oxidation annealed plate with even oxidation layer and stable product quality on the continuous annealing production line. The technical scheme in the invention comprises the steps of preheating, heating, soaking, spray air-cooled oxidation and the like, wherein the spray air-cooled oxidation step is finished at the cooling section of an annealing furnace, the plate temperature of a band steel entering into the cooling section is 700+/-20 DEG C, a spray air-cooled blower at the head part of the cooling section blows nitrogen gas, a spray air-cooled blower at the middle part of the cooling section blows mixed gases of nitrogen gas and compressed air, a spray air-cooled blower at the tail part of the cooling section blows nitrogen gas, and the plate temperature of the band steel entering into the spray air-cooled blower in the middle is 600-650 DEG C. The invention broadens the existing product structure of the continuous annealing production line, is favor of improving enterprise market competitiveness, and creates considerable economic benefit for enterprises while satisfying various requirements of users.
Description
Technical field
The present invention relates to a kind of steel plate production technique, particularly, belong to the metallurgical plate production technical field in the method for producing light oxidation annealed plate on continuous annealing production line.
Background technology
Light oxidation annealed plate is different with general annealed sheet, and its product also requires the surface that oxidizing reaction takes place except that requiring certain mechanical property, and the fine and close thickness of generation is about the zone of oxidation about 10 microns, thereby improves the surperficial erosion resistance of annealed sheet.This product is mainly used in building, steel construction, household electrical appliances, automobile and other industries.Usually used light oxidation annealed plate is (being that coal moves back plate) that adopts discontinuous annealing way to produce at present, described discontinuous annealing process is that the band steel is opened the steel plate that flat back crosscut becomes certain-length, put into horizontal heater, process furnace is heating raw with the coal, furnace atmosphere is the normal air environment, by burning of coal steel plate is heated the back naturally cooling.Because process technology limit, output is lower, and there is the ununiformity of performance and zone of oxidation between each steel plate in products obtained therefrom, and this situation has limited the popularization and the use of light oxidation annealed plate product greatly.
The continuous annealing line production process is to carry out in the nitrogen hydrogen hybrid protection atmosphere of reductibility at present, and the coiled sheet surface of production does not have zone of oxidation, is issued to the purpose of clean annealing in the reductive action of hydrogen.Utilizing continuous annealing production line (comprising the dual-purpose production line of zinc-plated annealing) to carry out the light oxidation annealed plate volume produces, it is a kind of bold trial, it will be at the apparatus for production line characteristics, existing annealing process is carried out bigger adjustment, and especially the bad substrate surface that is difficult in of oxidising process control forms the compact oxide that reaches thickness requirement in furnace atmosphere state and the stove.Therefore, study and define rational technology, when guaranteeing the product mechanical property, obtain the weak oxide laminar surface of the good color and luster uniformity of tack, be on continuous annealing production line, to produce the technical bottleneck that high-quality light oxidation annealed plate is rolled up institute's Gonna breakthrough.
Summary of the invention
Technical problem to be solved by this invention provide a kind of production efficiency height, zone of oxidation evenly, the method for the producing light oxidation annealed plate on continuous annealing production line of constant product quality.
The alleged problem of the present invention is solved by following technical scheme:
A kind of method of producing light oxidation annealed plate on continuous annealing production line, its special feature is: it utilizes the continuous annealing line processing unit, produce oxidated layer thickness at 7～15 μ m oxidizing annealing plates, its technological process comprises preheating, heating, soaking, spray steps such as cold oxidation, the cold oxidation step of described spray is finished at the cooling section of annealing furnace, the plate temperature that the band steel advances cooling section is 700 ± 20 ℃, wherein the cooling section stem is sprayed the cold blast engine nitrogen-blow, cooling section middle part spray cold blast engine nitrogen-blow and compressed-air actuated mixed gas, cooling section afterbody spray cold blast engine nitrogen-blow, the plate temperature of band steel spray cold blast engine in the middle part of entering is between 600 ℃-650 ℃.
The method of above-mentioned producing light oxidation annealed plate on continuous annealing production line, the interior shielding gas of stove is single nitrogen in described preheating, heating, the soak step, nitrogen flow is 500～800m
3/ h, the Control for Oxygen Content in the nitrogen is at＜10ppm.
The method of above-mentioned producing light oxidation annealed plate on continuous annealing production line, compressed air pressure 30-40N in the cold oxidation step of described spray
(, pressurized air content is 4-6% in the mixed gas of described middle part spray cold blast engine winding-up.
The method of above-mentioned producing light oxidation annealed plate on continuous annealing production line, band steel Heating temperature is 700 ℃-750 ℃ in the described heating steps.
The inventive method is improved the process system that has continuous annealing production line now according to the product requirement of light oxidation annealed plate, through repetition test, find out in continuous annealing production line (comprising the dual-purpose production line of zinc-plated annealing) batch stably manufactured light oxidation annealed plate processing method.Adopt this processing method can eliminate the rolling processing internal stress of steel band, improve the plasticity and the toughness index of steel band greatly, reach the service requirements of annealed steel band strength and plasticity; Generate strong adhesion, the uniform zone of oxidation of color and luster at belt steel surface simultaneously, this zone of oxidation does not come off because of the machining deformation of material.The inventive method has been widened the product structure of existing continuous annealing production line, helps improving the market competitiveness of enterprises, when satisfying user's multiple demand, for enterprise creates considerable economic.
Embodiment
Continuous annealing production line of the present invention (comprising the dual-purpose production line of zinc-plated annealing), similar with general through type continuous annealing line, all be in annealing furnace, to make the band steel eliminate work hardening, finish recrystallization annealing, improve plasticity, the toughness of annealed sheet, reduce intensity and hardness.The present invention innovates part, and the one, furnace atmosphere adopts single nitrogen atmosphere, and this is that shielding gas is a nitrogen hydrogen mixeding gas in the annealing furnace because when producing the clean annealing plate, and the reducing power of hydrogen can guarantee to be with steel to guarantee quality product in that the stove internal surface is not oxidized; And when producing the oxidizing annealing plate, it is unaffected not feed hydrogen the finished product performance, so shielding gas adopts single nitrogen in the stove, can guarantee that production safety can save production cost again., the 2nd, by temperature control and feed pressurized air, realize substrate top layer oxidation in the cold step of spray, reach the annealed sheet surface form 7～15 μ m firmly, the purpose of compact oxide.
The inventive method is implemented on the continuous annealing production line that adopts the improvement Sendzimir method, and technical process is: uncoiling-cleaning-annealing furnace heating-annealing furnace soaking-annealing furnace oxidation cooling-polishing straightening-batch-finished product.The specification of its product oxidizing annealing plate is 0.3～2.0mm * 650～1650mm, and the oxidated layer thickness scope is at 7～15 μ m.Described improvement Sendzimir method comprises naked light heating zone, radiator tube heating zone, radiator tube soaking zone and cooling section, measures furnace temperature and plate temperature by the pyrometer in the stove, realizes the automatic of temperature and accurately control.The band steel is heated to 700-750 ℃ in naked light heating zone, radiator tube heating zone after preheating, 20 ℃-30 ℃ temperature drop is arranged approximately through the radiator tube soaking zone then, enters cooling section with 700 ± 20 ℃ temperature and sprays cold oxidation.The spray cold blast engine that is positioned at stem at cooling section is to band steel nitrogen-blow, belt steel temperature is reduced between 600 ℃-650 ℃, then by the spray cold blast engine nitrogen-blow and the compressed-air actuated mixed gas that are positioned at the cooling section middle part, by the spray cold blast engine nitrogen-blow that is positioned at the cooling section afterbody, make the band steel even oxidation take place, generate the zone of oxidation of strong adhesion on 450-650 ℃ temperature range surface.It is crucial that above-mentioned band steel sprays in the cold oxidation step temperature control, and when temperature is lower than 450 ℃ or when being higher than 650 ℃, the zone of oxidation of generation is sparse, easily come off, and can not reach the technology service requirements.The band steel can spray the temperature requirement of cold oxidation to reach the band steel by suitably adjusting spray cooling blower rotary speed at cooling section.The present invention sets up Y-junction and by-pass valve control on the air-supply pipeline of spray cold blast engine, pneumatic line and nitrogen pipeline are communicated with Y-junction respectively, cut off pneumatic line when producing the common annealing plate, lateral root is adjusted the aperture of nitrogen pipeline or pneumatic line when producing the oxidizing annealing plate according to needs.The oxidizing annealing plate is come out of the stove after polishing, straightening technology come off, and proves that zone of oxidation compactness is good.
Several embodiment below are provided:
Embodiment 1: kind SPCC; specification 1.0*1250mm; technological process: the production line travelling speed is 53mpm; the band steel enters in the stove after cleaning; the band steel enters the direct combustion section and is heated to 574 ℃ by naked light after preheating section is preheating to 170 ℃, is heated to 710 ℃ through radiator tube heating zone steel, and radiator tube soaking section strip steel is incubated at 680 ℃ by electric radiant tube; shielding gas is single nitrogen in the stove, and nitrogen flow is 500m
3/ h, the Control for Oxygen Content in the nitrogen is at＜10ppm.The plate temperature that the band steel enters cooling section is 680 ℃, and wherein cooling section stem spray cold blast engine nitrogen-blow sprays cold blast engine nitrogen-blow and compressed-air actuated mixed gas in the middle part of the cooling section, and pressurized air content is 4% in the mixed gas, compressed air pressure 30N
(, cooling section afterbody spray cold blast engine nitrogen-blow, the plate temperature of band steel spray cold blast engine in the middle part of entering is at 600 ℃.After spraying cold oxidation step, be with the straightening of steel polishing, batch finished product oxidated layer thickness 7 μ m.
Embodiment 2: kind SPCC; specification 2.0*1250mm; technological process: the production line travelling speed is 30mpm; the band steel enters in the stove after cleaning; the band steel enters the direct combustion section and is heated to 580 ℃ by naked light after preheating section is preheating to 150 ℃, is heated to 750 ℃ through radiator tube heating zone steel, and radiator tube soaking section strip steel is incubated at 720 ℃ by electric radiant tube; shielding gas is single nitrogen in the stove, and nitrogen flow is 800m
3/ h, the Control for Oxygen Content in the nitrogen is at＜10ppm.The plate temperature that the band steel enters cooling section is 720 ℃, wherein the cooling section stem is sprayed the cold blast engine nitrogen-blow, cooling section middle part spray cold blast engine nitrogen-blow and compressed-air actuated mixed gas, pressurized air content is 6% in the mixed gas, compressed air pressure 35N, cooling section afterbody spray cold blast engine nitrogen-blow, the band steel is 650 ℃ in the plate temperature that enters middle part spray cold blast engine.After spraying cold oxidation step, the band steel through the polishing straightening, batch finished product oxidated layer thickness 15 μ m.
Embodiment 3: kind SPCC; specification 0.5*1250mm; technological process: the production line travelling speed is 80mpm; the band steel enters in the stove after cleaning; the band steel enters the direct combustion section and is heated to 560 ℃ by naked light after preheating section is preheating to 180 ℃, is heated to 700 ℃ through radiator tube heating zone steel, and radiator tube soaking section strip steel is incubated at 680 ℃ by electric radiant tube; shielding gas is single nitrogen in the stove, and nitrogen flow is 600m
3/ h, the Control for Oxygen Content in the nitrogen is at＜10ppm.The plate temperature that the band steel enters cooling section is 680 ℃, wherein the cooling section stem is sprayed the cold blast engine nitrogen-blow, cooling section middle part spray cold blast engine nitrogen-blow and compressed-air actuated mixed gas, pressurized air content is 5% in the mixed gas, compressed air pressure 40N, cooling section afterbody spray cold blast engine nitrogen-blow, the band steel is 630 ℃ in the plate temperature that enters middle part spray cold blast engine.After spraying cold oxidation step, band steel light is through putting in order straightening, batching finished product oxidated layer thickness 10 μ m.
Claims (2)
1. the method for a producing light oxidation annealed plate on continuous annealing production line, it is characterized in that: it utilizes the continuous annealing line processing unit, produce oxidated layer thickness at 7～15 μ m oxidizing annealing plates, its technological process comprises preheating, heating, soaking, spray cold oxidation step, the cold oxidation step of described spray is finished at the cooling section of annealing furnace, the plate temperature that the band steel advances cooling section is 700 ± 20 ℃, wherein the cooling section stem is sprayed the cold blast engine nitrogen-blow, cooling section middle part spray cold blast engine nitrogen-blow and compressed-air actuated mixed gas, cooling section afterbody spray cold blast engine nitrogen-blow, the plate temperature of band steel spray cold blast engine in the middle part of entering is between 600 ℃-650 ℃; The interior shielding gas of stove is single nitrogen in described preheating, heating, the soak step, and nitrogen flow is 500～800m
3/ h, the Control for Oxygen Content in the nitrogen is at＜10ppm; Compressed air pressure 30-40N in the cold oxidation step of described spray, pressurized air content is 4-6% in the mixed gas of described middle part spray cold blast engine winding-up.
2. the method for producing light oxidation annealed plate on continuous annealing production line according to claim 1 is characterized in that: band steel Heating temperature is 700 ℃-750 ℃ in the described heating steps.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101950060A CN101871037B (en) | 2010-06-09 | 2010-06-09 | Method for producing light oxidation annealed plate on continuous annealing production line |
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| CN2010101950060A CN101871037B (en) | 2010-06-09 | 2010-06-09 | Method for producing light oxidation annealed plate on continuous annealing production line |
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| CN101871037A CN101871037A (en) | 2010-10-27 |
| CN101871037B true CN101871037B (en) | 2011-12-28 |
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| US5259893A (en) * | 1991-07-08 | 1993-11-09 | Air Products And Chemicals, Inc. | In-situ generation of heat treating atmospheres using a mixture of non-cryogenically produced nitrogen and a hydrocarbon gas |
| CN1058755C (en) * | 1995-03-23 | 2000-11-22 | 新日本制铁株式会社 | Continuous annealing furnace |
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Address after: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee after: River steel Limited by Share Ltd Tangshan branch Address before: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee before: Hebei Steel Co., Ltd., Tangshan Branch |