Finishing withdrawing-straightening tension control method for deep-draw galvanized steel sheet
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A galvanized steel sheet and tension control technology, applied in the direction of tension/pressure control, etc., can solve the problems of reducing the profit margin of deep-drawing galvanized products, increasing the production difficulty of deep-drawing galvanized products, and excessive elongation, etc., to achieve The effect of reducing the performance change rate, improving the surface quality, and good physical properties
Active Publication Date: 2014-07-23
HEBEI IRON AND STEEL
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Problems solved by technology
The elongation of skin-pass stretching and straightening has a great influence on the performance of deep-drawing galvanized products. In order to obtain good performance indicators, the elongation must be limited, but low elongation will generally result in poor surface quality of products, and to obtain good The surface quality must use a large skin elongation, but if the elongation is too large, the performance will deteriorate and cannot meet the needs of users. This contradictory situation greatly increases the difficulty of production of deep-drawing galvanized products. The problem also greatly reduces the profit margin of deep-drawing grade galvanized products
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Embodiment 1
[0022] Example 1: Deep-drawing galvanized product DC53D+Z was produced by the United States Iron and Steel Co., Ltd. galvanizing process.
[0023] The volume number of the product is 2Y02443N1;
[0025] The specification of strip steel is 1.0×1250mm, and the running speed of steel is 80m / min;
[0026] The tension value before finishing is 27KN;
[0027] The tension value after smoothing and straightening is 29KN;
[0028] The elongation rate of smooth stretching and straightening is 0.78%;
[0029] Other parameters are the same as those of ordinary galvanized products.
[0030] The actual performance of the product is yield strength: 160MPa; tensile strength: 293MPa, A80: 45.5%.
Embodiment 2
[0031] Example 2: Deep-drawing galvanized product DC53D+Z was produced by improving the Sendzimir galvanizing process.
[0032] The volume number of the product is 2Y19028N1;
[0033] Chemical composition Chemical composition: C: 0.04%, Si: 0.014%, Mn: 0.12%, P: 0.014%, S: 0.01%, ALs: 0.038%, Ti: 0.06%;
[0034] The specification of the strip steel is 0.7×1250mm, and the running speed of the strip steel is 83m / min;
[0035] The tension value before finishing is 22KN;
[0036] The tension value after smoothing and straightening is 24KN;
[0037] The elongation rate of smooth stretching and straightening is 0.82%;
[0038] Other parameters are the same as those of ordinary galvanized products.
[0039] The actual performance of the product is yield strength: 165MPa; tensile strength: 308MPa, A80: 44.5%.
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Abstract
The invention belongs to the technical field of galvanized steel sheet production methods, and relates to a finishing withdrawing-straightening tension control method for a deep-draw galvanized steel sheet for guaranteeing the steel sheet performance and the surface quality. According to the technical scheme, the tension set values before and after the finishing withdrawing-straightening are adjusted, and the matching relation between steel plates with different thicknesses and the tension before and after the finishing withdrawing-straightening is adopted, wherein the tension before finishing conforms to the formula: T(strip steel thickness)*(25-30)KN, and the tension after finishing and withdrawing-straightening conforms to the formula: T(strip steel thickness)*(27.5-33)KN. According to the finishing withdrawing-straightening tension control method, the surface quality of the deep-draw galvanized product can be guaranteed, the performance is not greatly affected, the requirement for machining and using performance of a user is met, and the performance aggravating effect brought by increasing the finishing rolling force to guarantee the surface of the deep-draw galvanized product is avoided. The performance judgment amending ratio of the deep-draw galvanized product is greatly reduced, the surface quality and the profit space of the deep-draw galvanized product are greatly improved, the competitiveness of enterprises is enhanced, and considerable economic benefits are brought to the enterprises.
Description
technical field [0001] The invention relates to a steel plate production process, in particular to a method for controlling the finishing tension leveling tension in order to ensure performance and surface quality during the production of deep-drawing galvanized products on a continuous galvanizing production line, which belongs to the production of galvanized steel plates method technology field. Background technique [0002] Due to its good stamping performance, deep-drawing galvanized products are generally used for deep-drawn parts with a certain stamping depth formed by one stamping, such as the outer panels of automobiles and household appliances. At present, the good stamping performance of deep-drawing galvanized products is mainly achieved by reducing the carbon content in raw materials, adding a certain amount of alloying elements such as Ni, Ti, etc., and achieving good performance indicators through high-temperature annealing and other means. Since the material ...
Claims
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