CN107587089B - Process for eliminating withdrawal and straightening lines on surface of galvanized door sheet steel - Google Patents
Process for eliminating withdrawal and straightening lines on surface of galvanized door sheet steel Download PDFInfo
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Abstract
The invention discloses a process for eliminating withdrawal and straightening lines on the surface of galvanized door sheet steel, which adopts the following process routes: pickling, rolling, cover annealing, flattening and galvanizing; the selected galvanized door plate steel comprises the chemical components with the weight percentage of less than or equal to 0.01 percent of C, less than or equal to 0.04 percent of Si, 0.15-0.25 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, 0.015-0.055 percent of Al, less than or equal to 0.004 percent of N and 0.001-0.002 percent of B; the process of the galvanized door plate steel is that the galvanized door plate steel is produced after coming out of a rolling mill and then enters a galvanizing line, but in the method of the invention, a process route is redesigned, the rolled door plate steel does not enter the galvanizing line firstly, the flow direction of the strip steel is adjusted firstly and then enters a cover type annealing furnace for complete annealing, the main purpose of the adjustment is to avoid the defect of incomplete annealing of the strip steel by the galvanized continuous annealing furnace, and the residual stress in the strip steel is eliminated due to the complete annealing, and the yield platform of the strip steel is thoroughly eliminated, so that the draw leveling defect on the surface of the strip steel can be improved and eliminated after the strip steel is galvanized.
Description
Technical Field
The invention relates to a process for eliminating withdrawal and straightening lines on the surface of galvanized door sheet steel.
Background
The method is characterized in that a cold-rolled galvanized door sheet steel product is developed, the product is transported to a client site to try a new product after being produced, the client feeds back that the surface withdrawal and straightening line defect of the galvanized door sheet steel is serious in the product trial process, and the galvanized door sheet steel new product is not approved by the client due to the quality defect of the surface withdrawal and straightening line.
The withdrawal and straightening line defects refer to transverse lines generated on the upper surface and the lower surface of the strip steel after withdrawal and straightening, are small in interval (<2mm) and width (<0.5mm), and are randomly distributed on the whole surface of the strip steel. The plating layer of the pulling and straightening line part is corroded, and the strip steel substrate is found to have the same lines. The defects of the withdrawal and straightening lines not only affect the attractive appearance of the product, but also affect the tensile strength, and the product is cracked from a place with serious withdrawal and straightening lines during a tensile test. The withdrawal and straightening line defect is a local yield and extension phenomenon of the strip steel on the bending roll in the withdrawal and straightening process. The analysis reason mainly comprises two factors, namely incomplete annealing of the galvanizing continuous annealing furnace causes that the yield flatness inside the strip steel is not completely eliminated; and secondly, the annealing process is unreasonable in setting, and the pulling and straightening lines on the surface of the product are caused by the comprehensive influence of the annealing process and the annealing process, but the pulling and straightening lines have a defect which is inevitably generated on a galvanizing production line without a finishing machine and cannot be eliminated. There is always no better treatment method for the rectification and prevention of such defects in domestic peers.
The following documents were searched for: 1. the surface line selection formation analysis and improvement technology of the hot-dip galvanized strip steel. 2010 national conference on steel rolling production technology. 2. And (3) analyzing the surface finishing defects of the non-zinc flower plating layer. The ninth China iron and steel annual meeting discourse in 2013. 3. The bright spot defect generation mechanism of the surface of the galvanized sheet for the automobile is researched. 2014 national steel rolling production technical conference. 4. Lisanxiang, analysis and countermeasure of the reasons of the hot galvanizing surface defects, 2014 national steel rolling production technical conference. In all searched documents, in the article description of the withdrawal and straightening line defects on the surface of galvanized door sheet steel, the temperature system of a continuous annealing furnace is regulated, the elongation or the roll surface quality of a withdrawal and straightening machine is regulated, but the treatment and control on the defects do not completely achieve the effect, the defects of the withdrawal and straightening line on the surface are still serious, and the serious defects on the surface of the product with higher quality requirement in the production of galvanized door sheet steel cannot be allowed.
Disclosure of Invention
The invention aims to provide a process for eliminating withdrawal and straightening lines on the surface of galvanized door sheet steel, and finally, the withdrawal and straightening lines on the surface of a galvanized door sheet steel product can be thoroughly improved.
The invention aims to realize the process for eliminating the withdrawal and straightening lines on the surface of the galvanized door sheet steel, and the selected process route is as follows: pickling, rolling, cover annealing, flattening and galvanizing;
1) the selected galvanized door plate steel comprises the chemical components with the weight percentage of less than or equal to 0.01 percent of C, less than or equal to 0.04 percent of Si, 0.15-0.25 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, 0.015-0.055 percent of Al, less than or equal to 0.004 percent of N and 0.001-0.002 percent of B;
2) the main points of the conventional control of cold rolling and pickling and a rolling mill are as follows: the control of cold-rolling pickling solution ensures that the oxide scales on the surface of the strip steel are pickled completely, and the cold-rolling mill is mainly used for ensuring that the outlet blowing pressure of a No. 5 rolling mill is not less than 5 kilograms; the heating temperature of the conventional hot rolling process is 1125-1185 ℃, the finishing temperature is 870 +/-20 ℃, the cooling mode is post-stage quick cooling, and the coiling temperature is 640 +/-20 ℃; the process key points of the cover annealing are as follows:
3) designing technological parameters of the temper mill: strip steel passes through the levelling machine process, and the main objective is to level the plate-type of strip steel, eliminates the inside yield platform of strip steel, and levelling machine key process parameter is the settlement of percentage elongation, through the test of different specifications, sets for the percentage elongation parameter according to the supplied materials thickness at this process:
4) the design of the galvanizing continuous annealing process comprises the following steps:
because the strip steel is completely annealed by annealing, the setting of the continuous annealing process parameters of the galvanizing unit only ensures the temperature of the adhesiveness of the zinc layer, the temperature of the annealing plate is limited to 480 +/-10 ℃, and the annealing process system of the galvanized door plate steel is set by repeatedly adjusting and debugging on site:
and continuing to perform subsequent production.
The chemical components used by the original strip steel are analyzed, the C, Si and N, Al contents of the strip steel are further adjusted and controlled in the steelmaking process respectively, the C content is reduced, meanwhile, the ductility of the strip steel is considered to be increased, and the element B is added into the components through further analysis by the invention team, so that the compactness and the hot rolling performance of the strip steel are changed.
The method mainly aims to avoid the defect that the galvanized continuous annealing furnace incompletely anneals the strip steel, and the incomplete annealing easily causes a yield platform inside the strip steel, so that the strip steel surface has the defect of straightening lines. The strip steel after being processed by the cover annealing furnace is completely annealed to eliminate the residual stress in the strip steel and completely eliminate the yield platform of the strip steel, so that the draw-leveling line defects on the surface of the strip steel can be improved and eliminated after the strip steel is galvanized.
The invention adjusts the steel components of the galvanized door sheet, and after cold rolling and acid washing and rolling, adjusts the traditional process route, and changes the original process route entering galvanizing into a process route without galvanizing, but tries to innovate the invention, and firstly enters a cover type annealing furnace for complete annealing, and then enters a galvanizing production line after the annealing process system of the cover type annealing furnace is newly adjusted, and the plate shape is controlled by leveling by a leveling machine, and at the moment, the corresponding galvanizing process is further redesigned, and the heating system of the galvanizing continuous annealing furnace is adjusted, thereby completing the adjustment and design of a whole set of new process method for producing the galvanized door sheet steel, and the serious draw line defect on the surface of the original galvanized door sheet steel is completely improved and eliminated through field debugging and trial production. The invention has obvious conversion and great economic benefit for improving the surface quality of the product for the current developed galvanized door plate steel product.
The new process route design of the invention brings the most remarkable achievement of improving and eliminating the withdrawal and straightening lines on the surface of the galvanized door sheet steel and improving the product quality of the galvanized door sheet steel product. The strip steel tested by the new process route has good surface quality, and is sent to a user for on-site trial to be approved by the user. Through the new process route design of the invention, the yield strength curve of the obtained galvanized door plate steel product presents a smooth curve, and the yield platform defect does not exist any more. The treatment of the drawing and straightening line defect problem of the surface of the galvanized door plate steel makes technical reserve and lays a foundation for developing the market of galvanized door plate steel products and further expanding the market of variety steel for sale, and the galvanized door plate steel products and the variety steel products are greatly promoted to the market, so that the process method can be referred to for the problems of product surface quality, product material hardness and the like, and has great reference value for improving the product quality; the design of the new process route and the process parameters opens up a new valuable road for the innovation of the production field technology and the breakthrough of the existing inherent technical management and process production mode, creates a new idea, and the design of the new invented process route achieves the creation of a new product. According to the design of the new process route and the process parameters, although two additional processes, namely a cover annealing process and a leveling process, are additionally added from steel making to cold rolling, the cost is increased by about 150 yuan, the profit of the final product of the galvanized door plate steel is increased by at least over 800 yuan plus 1000 yuan in the aspect of market selling price, so that the overall sales profit of the product is increased although the process cost is partially increased from the evaluation of the overall economic benefit, meanwhile, the successful trial production of the new product lays a foundation for increasing the market share and improving the market competitiveness, the quality problem of the drawing and straightening line product of the galvanized door plate steel is solved, the new product is successfully produced, and the future variety expansion and future development of a company are further developed.
Detailed Description
A process for eliminating withdrawal and straightening lines on the surface of galvanized door sheet steel selects the following process routes: pickling, rolling, cover annealing, flattening and galvanizing;
1) the selected galvanized door plate steel comprises the chemical components with the weight percentage of less than or equal to 0.01 percent of C, less than or equal to 0.04 percent of Si, 0.15-0.25 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, 0.015-0.055 percent of Al, less than or equal to 0.004 percent of N and 0.001-0.002 percent of B;
2) the main points of the conventional control of cold rolling and pickling and a rolling mill are as follows: the control of cold-rolling pickling solution ensures that the oxide scales on the surface of the strip steel are pickled completely, and the cold-rolling mill is mainly used for ensuring that the outlet blowing pressure of a No. 5 rolling mill is not less than 5 kilograms; the heating temperature of the conventional hot rolling process is 1125-1185 ℃, the finishing temperature is 870 +/-20 ℃, the cooling mode is post-stage quick cooling, and the coiling temperature is 640 +/-20 ℃; the process key points of the cover annealing are as follows:
3) designing technological parameters of the temper mill: strip steel passes through the levelling machine process, and the main objective is to level the plate-type of strip steel, eliminates the inside yield platform of strip steel, and levelling machine key process parameter is the settlement of percentage elongation, through the test of different specifications, sets for the percentage elongation parameter according to the supplied materials thickness at this process:
4) the design of the galvanizing continuous annealing process comprises the following steps:
because the strip steel is completely annealed by annealing, the setting of the continuous annealing process parameters of the galvanizing unit only ensures the temperature of the adhesiveness of the zinc layer, the temperature of the annealing plate is limited to 480 +/-10 ℃, and the annealing process system of the galvanized door plate steel is set by repeatedly adjusting and debugging on site:
and continuing to perform subsequent production.
Claims (1)
1. A process for eliminating withdrawal and straightening lines on the surface of galvanized door sheet steel is characterized by comprising the following steps: pickling, rolling, cover annealing, flattening and galvanizing;
1) the selected galvanized door plate steel comprises the chemical components with the weight percentage of less than or equal to 0.01 percent of C, less than or equal to 0.04 percent of Si, 0.15-0.25 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, 0.015-0.055 percent of Al, less than or equal to 0.004 percent of N and 0.001-0.002 percent of B;
2) the main points of the conventional control of cold rolling and pickling and a rolling mill are as follows: the control of cold-rolling pickling solution ensures that the oxide scales on the surface of the strip steel are pickled completely, and the cold-rolling mill is mainly used for ensuring that the outlet blowing pressure of a No. 5 rolling mill is not less than 5 kilograms; the heating temperature of the conventional hot rolling process is 1125-1185 ℃, the finishing temperature is 870 +/-20 ℃, the cooling mode is post-stage quick cooling, and the coiling temperature is 640 +/-20 ℃; the process key points of the cover annealing are as follows:
3) designing technological parameters of the temper mill: strip steel passes through the levelling machine process, and the main objective is to level the plate-type of strip steel, eliminates the inside yield platform of strip steel, and levelling machine key process parameter is the settlement of percentage elongation, through the test of different specifications, sets for the percentage elongation parameter according to the supplied materials thickness at this process:
4) the design of the galvanizing continuous annealing process comprises the following steps:
because the strip steel is completely annealed by annealing, the setting of the continuous annealing process parameters of the galvanizing unit only ensures the temperature of the adhesiveness of the zinc layer, the temperature of the annealing plate is limited to 480 +/-10 ℃, and the annealing process system of the galvanized door plate steel is set by repeatedly adjusting and debugging on site:
and continuing to perform subsequent production.
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| CN110863137B (en) * | 2018-08-27 | 2021-05-07 | 上海梅山钢铁股份有限公司 | Method for manufacturing hot-dip aluminum-zinc steel plate |
| CN111451323A (en) * | 2020-04-21 | 2020-07-28 | 山东钢铁集团日照有限公司 | Method for eliminating yield platform of hot-dip galvanized low-alloy high-strength steel |
| CN111676435A (en) * | 2020-06-22 | 2020-09-18 | 鞍钢蒂森克虏伯（重庆）汽车钢有限公司 | Making process of zinc-plated alloy without stripe defect and reaction tower thereof |
| CN114101341B (en) * | 2021-11-16 | 2024-03-19 | 鞍钢联众(广州)不锈钢有限公司 | Method for eliminating ferrite stainless steel cold rolling yield platform |
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