CN103233192A - Production method of high-strength hot-dip galvanizing steel strip - Google Patents
Production method of high-strength hot-dip galvanizing steel strip Download PDFInfo
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- CN103233192A CN103233192A CN2013101760290A CN201310176029A CN103233192A CN 103233192 A CN103233192 A CN 103233192A CN 2013101760290 A CN2013101760290 A CN 2013101760290A CN 201310176029 A CN201310176029 A CN 201310176029A CN 103233192 A CN103233192 A CN 103233192A
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Abstract
The invention discloses a production method of a high-strength hot-dip galvanizing steel strip. According to the production method, after the steel strip is heated above a recrystallization temperature and is subjected to appropriate temperature preservation, a cooling medium incapable of causing the oxidation of the steel strip is sprayed on the surface of the high-temperature steel strip, wherein the cooling medium is liquid and can be vaporized at a high temperature to absorb lots of heat, thus the steel strip is rapidly cooled, the recrystallization change happens in very short time to generate very thin crystal particles, the effect of strength enhancement is achieved, and then the hot-dip galvanizing is carried out to produce the high-strength hot-dip galvanizing steel strip. The cooling medium can be but not limited to combustible materials such as hydrocarbon compounds, and if the cooling medium is the combustible material such as the hydrocarbon compound, the combustible material can be burned to assist steel strip heating during heating the steel strip and is fully utilized.
Description
Technical field
The present invention relates to the production method of hot dip process Galvanized Steel Strip, especially a kind of high strength hot dip immersion plating zinc steel band production method.
Background technology
As the reason that industry is known, the hot dip process Galvanized Steel Strip obtains after the continuous zinc coating production line is through degreasing, annealing, hot dip process rolling hardboard.Intensity is one of main performance index of hot dip process Galvanized Steel Strip, in order to save material, must improve intensity, and producing high-strength hot immersion plating Galvanized Steel Strip is the developing direction of industry, also is a great problem.At present, the approach that improves hot dip process Galvanized Steel Strip intensity first-selection is to adopt in the inner method of adding alloying element of iron and steel, will certainly increase difficulty and the cost of smelting like this.So people begin to increase zinc-plated speed of cooling later on, attempt to improve by the grain fineness number behind the refinement recrystallize research of intensity, but have little effect.This be because, the temperature of steel band when zinc-plated annealing is about 700-800 ℃, recrystallize during cooling is also from this temperature, and the temperature of galvanizing is about 455-475 ℃, steel band is equivalent to once cool off from about 700-800 ℃ beginning earlier in the galvanizing process, under about 455-475 ℃ temperature, be incubated the regular hour, and then secondary is cooled to normal temperature.In this case, because organizing of steel band inside finished recrystallize substantially under about 455-475 ℃ temperature, even the speed of cooling after zinc-plated is very fast, also be difficult to refinement interior tissue crystal grain.So the effect that improves intensity by increase plating back speed of cooling is not good certainly.
Need to prove that the method for cooling in steel band continuous hot-dipping galvanizing when annealing and the process of cooling that steel band continuous annealing is have basic different.Must proceed galvanizing after the annealing of steel band continuous hot-dipping galvanizing, just like the preceding described process that under about 455-475 ℃ temperature, is incubated, on the other hand the reductibility of steel strip surface be had relatively high expectations on the one hand, any oxidation can not be arranged; And the process of cooling of steel band continuous annealing just directly is cooled to normal temperature from annealing temperature, not have the process that is incubated, even and in certain scope steel strip surface have slight oxidation very not big to the influence of quality product.So, the former improves speed of cooling and is difficult to, and can not make water and so on can produce the heat-eliminating medium of chemical reaction with iron and steel, known method of cooling is to the steel strip surface spray temperature gas low than temperature of steel strips, absorb the heat of steel strip surface by convective heat exchange, speed of cooling is slower, and the crystal grain after crystallization is bigger, and the intensity of the galvanized sheet of Huo Deing is also just lower at last.And the latter just has the method (as the cooling etc. of spraying water) of multiple known high speed cooling, obtains thinner crystal grain and then obtains higher intensity.Retrieve the use method of cooling relevant with the present invention in the steel band continuous annealing as the auditor, please treat as two different categories.
In addition, please refer to the introduction that Xu Xiu flies " the steel strip hot-dip zinc technology question and answer " the 19th page to 20 pages of showing, the steel band galvanizing technique has improvement Sendzimir method and two kinds of methods of Sendzimir method, the difference of its essence is that the former carries out at same production line continuously to annealing and the zinc-plated two big operations of steel band, and the latter carries out two production lines interruptions respectively, the former superiority is self-evident, almost all adopt the former at present, the latter substantially all eliminates, so the steel band galvanizing technique of indication in the field of business is improved Sendzimir method exactly, The present invention be directed to the creation that these specified conditions of continuous device carry out.The applicant recognizes that Japanese Patent W02006/054564A1 also discloses a kind of method of making high-strength hot-dip galvanized plate, from the accompanying drawing 1 of this patent as can be seen, belong to the heating of annealing process, cooling and insulation are respectively 1, finish on 2 and No. 3 equipment, produce the intermediates of 150-500 ℃ of temperature, dividing then has plating and two paths of no plating, wherein having plated via to enter galvanizing equipment 4 carries out being cooled to normal temperature after the hot dip process and becomes the galvanized sheet product, as seen producing the galvanized sheet annealing process with this method is to carry out at different equipment with zincincation, it is typical Sendzimir method, belong to diverse two categories with the application in this case, its principle and method can not be mentioned in the same breath.Even so, if the scheme of " using spray cooling, water spray cooling that steel band is cooled off " in this patent is used on the application's the continuous device, that also is irrealizable at all, because steel plate can not have any oxidation when zinc-plated, this is general knowledge; And the scheme of this patent " use spray cooling, water spray cooling are cooled off steel band " arrives the steel billet temperature upper limit up under 500 ℃ the situation, and obviously meeting produces significant oxidation at steel band, and this also is general knowledge.As the technician of slightly professional background, can not expect using this method at continuous device.So, retrieve this patent as the auditor, please do not influence the application's creativeness.
Summary of the invention
In order to adopt difficulty and the cost that can increase smelting in the inner method of adding alloying element of iron and steel in the production that overcomes existing high-strength hot immersion plating Galvanized Steel Strip, and adopt and improve the deficiency that zinc-plated back speed of cooling has little effect, the present invention proposes a kind of production method of high-strength hot-dip galvanized steel band, it is characterized in that, be heated to more than the recrystallization temperature (about 700-800 ℃) at steel band, and after suitably being incubated, can not make steel band produce the heat-eliminating medium of oxidation to the spray of high-temperature steel belt surface, and heat-eliminating medium is liquid, at high temperature can produce vaporization, absorb a large amount of heats, thereby steel band is cooled off fast, produce recrystallize in a short period of time and change, generate very thin crystal grain, reach the effect that improves intensity.Selected heat-eliminating medium can but be not limited to the combustiblesubstance of hydrocarbon polymer and so on, if the combustiblesubstance of hydrocarbon polymer and so on, the auxiliary steel band heating of can burning when steel band heats is to make the best use of everything.
The technical solution adopted for the present invention to solve the technical problems is: when required zinc-plated steel band carries out anneal in stove, steel band is heated to recrystallization temperature according to processing requirement, generally be in about 700-800 ℃ scope, and suitably insulation, be cooled fast to about 455-475 ℃ zinc-plated temperature then, the present invention adopts to the method for high-temperature steel belt surface spray heat-eliminating medium and improves speed of cooling, selected heat-eliminating medium is liquid at ambient temperature, after being sprayed onto the steel band that steel strip surface touches high temperature, just can produce vaporization immediately, directly absorb a large amount of heats from steel strip surface, thereby make steel band with very fast speed cooling.If heat-eliminating medium is the combustiblesubstance (as industrial alcohol, butanone etc.) of hydrocarbon polymer and so on; can flow to heating zone with the opposite direction that shielding gas in the stove moves along steel band burns in the steel band heating zone; emit chemical heat, auxiliary steel band heating can not cause environmental pollution and energy dissipation.
The invention has the beneficial effects as follows, by the method to high-temperature steel belt surface spray heat-eliminating medium, after impelling required zinc-plated steel band heat tracing, producing recrystallize in a short period of time changes, generate very thin interior tissue crystal grain, reach the effect that improves intensity, produce high strength hot dip immersion plating zinc steel band, method is simple, and is respond well stable.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing is the schematic diagram of one embodiment of the invention.
1. steel bands among the figure, 2. steel band traffic direction, 3. process furnace heating zone, 4. process furnace holding-zone, 5. process furnace cooling section, 6. shower nozzle, 7. deflector roll, 8. zinc pot, 9. zinc liquid, 10. sinking roller.
Embodiment
Ask for an interview accompanying drawing, in one embodiment of the invention, steel band (1) enters process furnace along steel band traffic direction (2) and carries out anneal, at first arrive about 700-800 ℃ at process furnace heating zone (3) internal heating, and in process furnace holding-zone (4) under the said temperature insulation for some time after, enter process furnace cooling section (5), the zone that the present invention just is correlated with.The present invention's employing steel band (1) in process furnace cooling section (5) is provided with several shower nozzles (6) and other additional unit in both sides up and down, can can not make steel band produce the heat-eliminating medium of oxidation to steel band (1) spray from both direction up and down, the selected heat-eliminating medium of the present invention is liquid at ambient temperature, just can produce vaporization immediately after being sprayed onto the steel band (1) that steel band (1) surface touches high temperature, directly absorb a large amount of heats from steel band (1) surface, thereby make steel band (1) with very fast speed cooling, producing recrystallize in a short period of time changes, generate very thin interior tissue crystal grain, reach the effect that improves intensity.Simultaneously, employed liquid cooling medium can not be that steel band produces oxidation, then steel band (1) with surperficial non-oxidation state in deflector roll (7) enter zinc pot (8), in the zinc liquid (9) of about 455-475 ℃ temperature, carry out hot dip process, and behind sinking roller (10), leave zinc pot (8), produce high strength hot dip immersion plating zinc steel band.Selected heat-eliminating medium can but be not limited to the combustiblesubstance of hydrocarbon polymer and so on.The traffic direction of heating furnace gas is opposite with steel band traffic direction (2), be that the interior gas of process furnace cooling section (5) flows to process furnace holding-zone (4) and process furnace heating zone (3) successively, if the combustiblesubstance of hydrocarbon polymer and so on (as industrial alcohol, butanone etc.), can burn in the steel band heating zone, emit chemical heat, auxiliary steel band heating can not cause environmental pollution and energy dissipation.
In the application's a commercial applications example, common continuous zinc coating production line is transformed, both sides have respectively increased by four row's shower nozzles under the steel band worker of its cooling section, flow with 30-35kg/min, to steel strip surface spray industrial methanol, industrial methanol runs into the steel band of high temperature vaporizes immediately, and takes away a large amount of heats, make steel band zinc-plated after 4-5 drops to 455-475 ℃ by 700-800 ℃ in second, produced high-strength hot-dip galvanized plate.Compare before with transformation, under the situation of using same raw material, product organizes the crystal grain rank to rise to the 9-10 level by the 6-7 level, and the mechanical property yield strength has risen to 420-500Mpa by 260-300Mpa, has no progeny and stretches rate A
50Risen to 40%-44% by 36%-40%.Technological transformation by the application, use common raw material, stably produced other galvanized sheet of S350GD+Z level, compare with the high-intensity starting material of employing, 38-45 unit/ton though production cost has risen has been saved raw materials cost 120-150 unit/ton, and real cost of production has reduced 82-105 unit/ton, year, economic benefit was above 8,500,000 yuan, in the commercial success that obtained.
As seen, the inventive method is simple, and commercial utilization is respond well stable, is a kind of working method of exquisiteness.
Claims (4)
1. the production method of a high-strength hot-dip galvanized steel band, it is characterized in that, be heated to more than the recrystallization temperature (about 710-730 ℃) at steel band, and after suitably being incubated, can not make steel band produce the heat-eliminating medium of oxidation to the spray of high-temperature steel belt surface, make steel band be cooled fast to zinc-plated required temperature, and carry out galvanizing at same equipment.
2. the production method of high-strength hot-dip galvanized steel band according to claim 1, it is characterized in that: selected heat-eliminating medium can not be water or the material that contains water.
3. according to the production method of claim 1 and 2 described high-strength hot-dip galvanized steel bands, it is characterized in that: selected heat-eliminating medium, can but be not limited to the combustiblesubstance of hydrocarbon polymer and so on, be liquid at normal temperatures, at high temperature can produce vaporization, absorb a large amount of heat of steel band, thereby making steel band produce recrystallize in a short period of time changes, generate very thin crystal grain, reach the effect that improves intensity, produce high-strength hot-dip galvanized steel band.
4. according to the production method of claim 1,2 and 3 described high-strength hot-dip galvanized steel bands; it is characterized in that: if selected heat-eliminating medium is combustiblematerials; then thereby the inflammable gas after the vaporization flow to steel band heating zone and air mixed burning with shielding gas in the stove, emits heat and makes the steel band heating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101760290A CN103233192A (en) | 2013-05-10 | 2013-05-10 | Production method of high-strength hot-dip galvanizing steel strip |
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| CN2013101760290A CN103233192A (en) | 2013-05-10 | 2013-05-10 | Production method of high-strength hot-dip galvanizing steel strip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105793446A (en) * | 2013-12-05 | 2016-07-20 | 法孚斯坦因公司 | Method and apparatus for continuous thermal treatment of steel strip |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031474A (en) * | 2010-12-07 | 2011-04-27 | 重庆万达薄板有限公司 | Method for producing high-strength hot dipped galvanized steel strips |
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- 2013-05-10 CN CN2013101760290A patent/CN103233192A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031474A (en) * | 2010-12-07 | 2011-04-27 | 重庆万达薄板有限公司 | Method for producing high-strength hot dipped galvanized steel strips |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105793446A (en) * | 2013-12-05 | 2016-07-20 | 法孚斯坦因公司 | Method and apparatus for continuous thermal treatment of steel strip |
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Application publication date: 20130807 |