CN106319354A - Medium-size back plate punching distortion resisting galvanized steel and manufacturing method thereof - Google Patents
Medium-size back plate punching distortion resisting galvanized steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to medium-size back plate punching distortion resisting galvanized steel and a manufacturing method thereof, and mains solves the technical problem of generation of distortion of 22-29-inch liquid crystal back plate modules in the punching process. In order to achieve the purpose, a substrate comprises the following chemical components (weight percentage): 0.010-0.019% of C, 0.01-0.03% of Si, 0.05-0.09% of Mn, 0.01-0.06% of Al, P not more than 0.015%, S not more than 0.010%, 0.0010-0.0020% of B, and the balance of Fe and inevitable impurity elements. A plate blank is rolled after heating; the final rolling temperature is 850-900 DEG C; the coiling temperature is 730-750 DEG C; a hot-rolled steel plate is obtained through rolling; the hot-rolled plate is coldly rolled on a reversible rolling or five-frame cold continuous rolling mill after uncoiling and acid washing, and is annealed by an annealing furnace; the soaking temperature is 800-850 DEG C; the soaking time is 30-40 seconds; and a final product is obtained. The medium-size back plate punching distortion resisting galvanized steel is suitable for 0.5-0.6 mm galvanized steel plates for punching liquid crystal back plate modules.
Description
Technical field
The present invention relates to the method that a kind of 22-29 of solution cun of liquid crystal backboard module punching course is distorted, the material behavior being distorted by analyzing influence punching course, have found one to improve steel plate punched process and be distorted method, it is adaptable to liquid crystal backboard module punch process 0.5-0.6mm galvanized steel plain sheet.
Background technology
Raising along with people's living standard, increasing electronic display uses crystal liquid mode to show, the size that liquid crystal display uses simultaneously is increasing, size according to liquid crystal display screen can be divided in three classes, one class is with the small size liquid crystal display screen less than 21 inches, two classes are with the medium-size liquid crystal screen of 22-29 inch, and three classes are with the Large-size LCD Screen of 32-49 inch.nullLiquid crystal display is liquid crystal module for supporting the component of liquid crystal display screen，It is divided into module frame and module backboard，Module frame can pass through welding processing molding，The module backboard course of processing is more complicated，Steel plate is through undue bar、Cutting plate and punch forming realize，Liquid crystal backboard product after punching press has higher requirement to unevenness after punching press，Usually require that less than or equal to below 1.5mm，If unevenness does not reaches requirement，Module backboard when assembling can contact with liquid crystal light source fluorescent tube，Damage fluorescent tube，Subsequent product can not meet in course of processing unevenness and requires then to occur processing to be automatically performed simultaneously，Therefore，Backboard product requires there is higher stiffness requirement to the steel plate after steel plate forming，The stiffness of molding backboard and its molding back board structure、Original steel plate unevenness and steel plate materials characteristic are correlated with，Existing product steel plate yield strength is actual in 250-400MPa scope，Simultaneously big along with the change of liquid crystal display screen size，The current material phenomenon that is distorted is increasingly severe，After especially generally there is punching press during the medium-size liquid crystal screen backboard product being applied to 22-29 inch is actually used, steel plate is distorted problem，I.e. after punching press steel plain part unevenness more than 1.5mm，People try every possible means to improve the most always and control is distorted problem.
Therefore, according to the processing characteristic needs of industry product, research one is suitable for 22-29 inch liquid crystal backboard product steel plate and is not distorted after punching press method, to improve distortion resistance after punching press.
Chinese Patent Application No. 201010263178.7 discloses hot-dip galvanizing sheet steel and manufacture method thereof and application, LED LCD TV back cover, its main uses is close with patent of the present invention, mainly solves the problems such as drawing crack easily occur for structure complexity, the bigger product of stretching.Contrast patent document, the distortion problem that problem and the patent of the present invention of its cracking solved solve differs, not strong with comparability of the present invention, but the technique of its correspondence can make certain comparison.
Summary of the invention
It is an object of the invention to study a kind of 22-29 of being suitable for inch medium size zinc-plated liquid crystal backboard product and meet the method that steel plate is not distorted after punching press, mainly solve the technical problem being distorted medium size backboard punching course be applicable to galvanized steel plain sheet product.In order to solve the problem of medium size distortion, need solution applicable material yield strength not reach and improve punching press distortion requirement and material lateral performance homogeneity question.
The technical thought that the present invention takes is that research one utilizes carbon aluminium-killed steel, by adding trace element, by unconventional annealing process technology, the low surrender of material reached and performance uniformity requirement, thus improve and eliminate the generation of medium size backboard distortion problem.
For reaching above-mentioned purpose, the chemical analysis (percentage by weight) of substrate of the present invention is: C:0.010～0.019%, Si:0.01-0.03%, Mn:0.05-0.09%, Al:0.01-0.06%, P≤0.015%, S≤0.010%, B:0.0010-0.0020%, surplus is Fe and inevitable tramp element.
Of the present invention a kind of improving in the method that steel plate punched process is distorted, the reason that material chemical composition limits within the above range is as follows:
[carbon]: solution strengthening element in steel, controls material yield strength, and when the amount of being simultaneously introduced is very few, material phase transformation point Ar3 improves, and it is big that technique realizes difficulty, and material structure performance uniformity can not be guaranteed, and therefore, sets carbon content 0.010～0.019%.
[manganese]: solution strengthening element in steel, controls material yield strength, in order to obtain the steel plate of suitable performance in the present invention, add a small amount of manganese and reduce material phase transformation point Ar3, ensure material structure uniformity, in order to obtain the properties of product of low surrender, set Fe content as 0.05-0.09%.
[boron]: boron is among the austenite stabilizing elements, can effectively reduce material phase transformation point Ar3, process window realizes easily, material structure uniformity is more preferable, simultaneously during hot rolling, the precipitation of thick BN, growing up of the most original ferrite crystal grain, creating conditions for realizing final products, the present invention sets content as 0.0010-0.0020%.
[silicon]: higher content intensified element, for cold-rolled products, during Si content height, there is red rust iron scale in steel hot rolling surface hour hands, affect finished appearance, and the Si content in the present invention is set as 0.01-0.03%.
[sulfur]: the S in the present invention is impurity element, according to actual steel capacity, application claims S span of control is S≤0.010%.
[phosphorus]: the P in the present invention is impurity element, according to actual steel capacity, application claims P content controls as P≤0.015%
In the present invention in manufacture method:
Slab heating temperature: ensureing complete austenitizing and hot-working requirement, heating-up temperature is at 1100-1200 DEG C.
Finishing temperature: owing in steel, carbon designs for low-carbon (LC), material phase transformation point A3 is caused to improve, the addition of micronutrient boron reduces transformation temperature A3, through the testing of materials and calculating, its transformation temperature A3 scope is 850-860 DEG C, according to analysis of experiments, in order to reach the uniform purpose of material, therefore the present invention sets finish rolling finishing temperature as 850 DEG C～900 DEG C.
Coiling temperature: coiling temperature is precipitated with impact to ferrite grain size and pearlite, in order to obtain thick ferritic structure, creates conditions for final products performance, and the coiling temperature set is as 730 DEG C～750 DEG C.
Annealing temperature: realize material grains by annealing and grow up, improve material plasticity, it is found by experiment that, along with the material yield strength of annealing temperature declines, but after material enters two-phase section, material yield strength starts to raise, then decline, therefore, steel band is 800～850 DEG C in the annealing region of the soaking zone of continuous annealing furnace, and the annealing soak time is the 30-40 second.
Yield strength R of substrate of the present inventionP0.2For 190-230Mpa, tensile strength Rm 290-350Mpa, percentage elongation (A80) 35-45%, longitudinal yield strength extreme difference 0-10MPa, preferably control longitudinal yield strength extreme difference 5-10MPa.Microscopic structure is recrystallization ferritic structure+pearlite, and crystallite dimension is 15-25 μm, it is adaptable to 22-29 cun of liquid crystal backboard module punch process 0.5-0.6mm galvanized steel plain sheet.
The method have the benefit that the present invention is compared with number of patent application 201010263178.7 " hot-dip galvanizing sheet steel and manufacture method thereof and application, LED LCD TV back cover ", 1, publication is in chemical composition, owing to its scope is the most wide in range, the carbon content of its 2 embodiments is not inconsistent with technical scheme, and exploitativeness is the strongest；2, on publication steel sheet manufacturing method, it is not provided that hot-rolled process parameter, and its annealing process is 650 × 2h, and the time of even moving back with the present invention is significantly different, and the annealing time of the present invention only 30-40 second, production efficiency of the present invention is higher；3, publication performance is the most wide in range, it is impossible to determine its concrete value；4, product function aspect, publication solves problem of Cracking, though material property covers this patent scope, material structure uniformity of the present invention is more preferable, preferably solves twisting technique problem.Designed by carbon aluminium-killed steel composition, avoid the design of ultra-low-carbon steel composition, thus on technique realizes, need not move through RH operation decarburization can realize the product technology ability of ultralow surrender；5, by adding trace element method, it is possible to significantly improve homogenous material properties, it is achieved product manufacturing stability improves in amplitude, the technology annealed by a kind of two-phase section, it is easy to realize material low yield behavior requirement.The inventive method is the development of a kind of galvanized steel plain sheet, can solve a kind of method that medium size backboard product is distorted, and this material technology window is relatively big simultaneously, and industrial realization is easier to.
Accompanying drawing explanation
Fig. 1 is the metallographic structure photo of the embodiment of the present invention 2.
Fig. 2 is the metallographic structure photo of comparative example 2 of the present invention.
Fig. 3 is that the embodiment of the present invention 1 plate is indulged to yield strength uniform distribution figure.
Fig. 4 is that comparative example 1 plate of the present invention is indulged to yield strength uniform distribution figure.
Detailed description of the invention
Below in conjunction with embodiment 18 and comparative example 1-6, the invention will be further described, as shown in table 1, table 2:
Strip steel shown in table 1, table 2 its all by conventional steelmaking converter melting, by adding alloying element carbon, manganese, boron obtains meeting the requirements the continuous casting billet of chemical composition, slab rolls after heating, and finishing temperature is 850-900 DEG C, and coiling temperature is 730-750 DEG C, rolling obtains hot rolled steel plate, hot rolled plate uncoiling again, after overpickling, carries out cold rolling on reversible rolling or 5 Stands Cold Tandem Mills, and last annealed stove is annealed, soaking temperature 800-850 DEG C, the soaking time 30-40 second.Table 3 is embodiment 1-8 and comparative example 1-6 is the unevenness contrast after different steel plate carries out punch test, is confirmed whether the result of the test being distorted.
It is distorted and judges according to following standard, represent zero non-warping, × represent distortion；
Zero: unevenness is less than or equal to 1.5mm
×: unevenness is more than 1.5mm.
For the purpose not being distorted after reaching punching press, emphasis of the present invention solves the yield strength of production board and requires and the homogeneity question of plate width direction yield strength.From Tables 1 and 2, for controlling the scope of material property, by taking interpolation carbon, manganese, boron element carries out ferrite matrix strengthening and corresponding hot rolling, cold-rolling process mates, embodiment 1-8 adds different carbon contents with comparative example 1-6 contrast, Fe content, the Boron contents impact on material property, test shows that material carbon content control is at 0.01-0.019%, Fe content controls in the range of 0.05-0.09%, yield strength range-controllable system is at 190-230MPa, tensile strength scope is 292-349MPa, material percentage elongation scope is 36-45%, longitudinal yield strength extreme difference 5-10MPa.Fig. 1 is the metallographic structure photo of embodiment 2, it is thus achieved that recrystallization ferrite+pearlitic structrure, and crystallite dimension is 15-25 μm.The metallographic structure photo of Fig. 2 comparative example 2, relative to Fig. 1, its recrystal grain is tiny, crystallite dimension 10-14 μm, and content of pearlite in alloy is high.
Embodiment 1 and comparative example 3 contrast by adding boron element and low Fe content to the impact of finished product yield strength respectively, found by contrast, adding 0.0020% boron element yield strength is 216MPa, it is not distorted after punching press, and being not added with element boron yield strength is 260MPa, it is distorted after punching press, element adds boron element and advantageously reduces steel plate yield strength.Fig. 3 shows that embodiment 1 plate is indulged to yield strength uniform distribution figure.
Embodiment 2 and comparative example 1 contrast by adding boron element to homogenous material properties impact, found by contrast, add 0.0015% boron element embodiment 1 and surrender extreme difference 5MPa, be not distorted after punching press phenomenon, and be not added with boron element comparative example 1 and surrender extreme difference 15MPa, it is distorted after its result punching press.Fig. 4 shows that comparative example 1 plate is indulged to yield strength uniform distribution figure.
Embodiment 4 and comparative example 2 contrast respectively to be affected finished product yield strength by different carbon contents, found by contrast, adding 0.014% carbon yield strength is 200MPa, it is not distorted after punching press, and adding 0.04% carbon yield strength is 265MPa, being distorted after punching press, in element, the control of carbon element content advantageously reduces steel plate yield strength.
Embodiment 6 and comparative example 4 contrast finishing temperature change to be affected homogenous material properties, being found by contrast, during finishing temperature 900 degree, embodiment 6 surrenders extreme difference 7MPa, and be not distorted after punching press phenomenon, and 840 degree of comparative examples 4 of finishing temperature surrender extreme difference 18MPa, it is distorted after its result punching press.
Embodiment 7 and comparative example 5 contrast coiling temperature change to be affected homogenous material properties, found by contrast, embodiment 7 yield strength 205MPa during coiling temperature 746 DEG C, be not distorted after punching press phenomenon, and 600 degree of comparative example 5 yield strengths 245MPa of coiling temperature, it is distorted after its result punching press.
Embodiment 8 and comparative example 6, comparative example 7 contrast the annealing temperature change impact on material property, found by contrast, anneal 850 DEG C, 32 seconds time, obtain yield strength 208MPa, be not distorted after punching press phenomenon, and 780 DEG C of yield strengths 280MPa of comparative example 6 annealing temperature, 760 DEG C of yield strengths 260MPa of comparative example 7 annealing temperature, illustrative material yield strength when two-phase section is annealed declines afterwards along with temperature raises first to rise, its result is distorted after causing punching press.
In addition to the implementation, the present invention can also have other embodiments.The technical scheme that all employing equivalents or equivalent transformation are formed, all falls within the protection domain of application claims.
Table 1: different chemical composition result of the test
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Table 2: different technical parameters result of the test
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Table 3: different performance material punch test result
Claims (3)
1. a medium size backboard anti-impact pressure distortion galvanized steel, the chemical ingredients by weight percent that it is characterized in that the substrate of steel is: C:0.010～0.019%, Si:0.01-0.03%, Mn:0.05-0.09%, Al:0.01-0.06%, P≤0.015%, S≤0.010%, B:0.0010-0.0020%, surplus is Fe and inevitable tramp element.
2. medium size backboard anti-impact pressure distortion galvanized steel method described in a manufacturing claims 1, it is characterized by: by conventional steelmaking converter melting, obtain meeting the requirements the continuous casting billet of chemical composition by adding alloying element, slab rolls after heating, finishing temperature is 850-900 DEG C, coiling temperature is 730-750 DEG C, rolling obtains hot rolled steel plate, hot rolled plate uncoiling again is after overpickling, reversible rolling or 5 Stands Cold Tandem Mills are carried out cold rolling, last annealed stove is annealed, soaking temperature 800-850 DEG C, the soaking time 30-40 second, obtain final products.
Medium size backboard anti-impact the most according to claim 1 pressure distortion galvanized steel, is characterized in that yield strength R of the substrate of described steelP0.2For 190-230Mpa, tensile strength Rm 290-350Mpa, percentage elongation 35-45%, longitudinal yield strength extreme difference 0-10MPa, being organized as ferrite+pearlite, crystallite dimension is 15-25 μm.
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Cited By (2)
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| CN110541107A (en) * | 2018-05-28 | 2019-12-06 | 上海梅山钢铁股份有限公司 | Hot-dip aluminum-zinc steel plate with tensile strength of 600MPa and manufacturing method thereof |
| CN112553537A (en) * | 2019-09-25 | 2021-03-26 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip galvanized steel sheet with yield strength of 240MPa and manufacturing method thereof |
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| CN102378824A (en) * | 2009-03-31 | 2012-03-14 | 杰富意钢铁株式会社 | High-strength hot-dip galvanized steel plate and method for producing same |
| CN102758129A (en) * | 2012-06-19 | 2012-10-31 | 河北钢铁股份有限公司邯郸分公司 | Method for manufacturing non-spangle galvanized sheet DX54D+Z from aluminum killed steel |
| CN104046890A (en) * | 2014-06-09 | 2014-09-17 | 首钢总公司 | High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102378824A (en) * | 2009-03-31 | 2012-03-14 | 杰富意钢铁株式会社 | High-strength hot-dip galvanized steel plate and method for producing same |
| CN102758129A (en) * | 2012-06-19 | 2012-10-31 | 河北钢铁股份有限公司邯郸分公司 | Method for manufacturing non-spangle galvanized sheet DX54D+Z from aluminum killed steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110541107A (en) * | 2018-05-28 | 2019-12-06 | 上海梅山钢铁股份有限公司 | Hot-dip aluminum-zinc steel plate with tensile strength of 600MPa and manufacturing method thereof |
| CN110541107B (en) * | 2018-05-28 | 2021-04-06 | 上海梅山钢铁股份有限公司 | Hot-dip aluminum-zinc steel plate with tensile strength of 600MPa and manufacturing method thereof |
| CN112553537A (en) * | 2019-09-25 | 2021-03-26 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip galvanized steel sheet with yield strength of 240MPa and manufacturing method thereof |
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