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A kind of tension control method for fair drawing and straightening of deep-drawn galvanized steel sheet

A galvanized steel sheet and tension control technology, applied in tension/pressure control and other directions, can solve problems such as increasing the production difficulty of deep-drawing galvanized products, reducing the profit margin and poor surface quality of deep-drawing galvanizing products, and achieving the reduction of The effect of performance revision rate, reduction of production difficulty, and good physical properties

Active Publication Date: 2016-06-01
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: DC53D+Z, a deep-drawing galvanized product, was produced by the U.S. Steel Union galvanizing process.

[0023] Product's volume number 2Y02443N1;

[0024] Chemical composition: C: 0.04%, Si: 0.006%, Mn: 0.11%, P: 0.013%, S: 0.005%, ALs: 0.033%, Ti: 0.06%;

[0025] The specification of the strip is 1.0×1250mm, and the running speed of the steel is 80m / min;

[0026] The tension value before smoothing is 27KN;

[0027] The tension value after finishing and straightening is 29KN;

[0028] The elongation of the fair-stretching 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: Improved Sendzimir galvanizing process to produce deep-drawing galvanized product DC53D+Z.

[0032] The roll 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 is 0.7×1250mm, and the running speed of the strip is 83m / min;

[0035] The tension value before smoothing is 22KN;

[0036] The tension value after finishing and straightening is 24KN;

[0037] The elongation of skin-passing 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 smoothing and straightening tension in order to ensure performance and surface quality during the production of deep-drawing galvanized products on a continuous galvanizing production line, belonging to the production of galvanized steel plates. Method technical field. Background technique [0002] Due to its good stamping performance, deep-drawing galvanized products are generally used for deep-drawing parts with a certain stamping depth and a certain stamping depth, such as automobile outer panels, home appliance outer panels and other industries. At present, the good stamping performance of deep-drawing galvanized products is mainly achieved by reducing the carbon content in the raw materials, adding a certain amount of alloying elements such as Ni, Ti, etc., and through high-temperature annealing and other means to achieve good performance indic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/48
Inventor 李建英齐长发徐杰梅淑文张静韩冰王力达武冠华魏焕君孙力齐建群冯慧霄弓俊杰张斌卢英杰
Owner HEBEI IRON AND STEEL
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