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Production method of hot dipped steel coil

A production method and technology for steel coils, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problem of low width precision of hot-dip steel coils

Active Publication Date: 2013-05-15
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of low width accuracy of hot-dip steel coils obtained by the existing method, and provide a production method capable of obtaining hot-dip steel coils with high width accuracy

Method used

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Examples

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preparation example Construction

[0011] According to the present invention, the preparation method of the cast slab can adopt conventional methods in the art, as long as it is preferred that in the cast slab of the present invention, based on the total mass of the cast slab, the carbon content is 0.04-0.1 % by weight, the content of the manganese is 0.2-0.5% by weight, the content of the phosphorus is 0.06-0.09% by weight, the content of the niobium is 0.015-0.03% by weight, the content of the silicon is ≤0.05% by weight, the The content of the sulfur is ≤0.015% by weight, and the content of the aluminum is 0.02-0.07% by weight. Generally speaking, the preparation method of the slab includes: performing primary smelting of molten iron to obtain molten steel, and tapping the molten steel obtained from the primary smelting into a ladle; performing pre-deoxidation alloying and carburization of molten steel during the tapping process ; After tapping, the molten steel in the ladle is refined in a ladle furnace. Th...

Embodiment 1

[0024] This embodiment is used to illustrate the method for producing hot-dip steel coil provided by the present invention.

[0025] The slab (composition: based on the total weight of the slab, C: 0.04% by weight, Si: 0.01% by weight, Mn: 0.21% by weight, P: 0.06% by weight, S: 0.011% by weight, Nb: 0.015% by weight , Al: 0.07% by weight, the balance is iron) After soaking at 1200°C, rough roll into a 30mm thick intermediate billet with a rough rolling mill, and the final rolling temperature of the rough rolling is 1050°C; then roll a 4mm hot billet with a finish rolling mill Strip steel, the final rolling temperature of finish rolling is 880°C; after finish rolling, it is cooled to 600°C at a rate of 200°C / s, and then cooled to 500°C at a rate of 10°C / s, and then enters the coiler to be coiled into roll. After the strip is cooled to room temperature (25°C), cut the edge with a disc, control the width at 1002mm, pickle it with hydrochloric acid with a concentration of 170g / L...

Embodiment 2

[0027] This embodiment is used to illustrate the method for producing hot-dip steel coil provided by the present invention.

[0028] The slab (composition: based on the total weight of the slab, C: 0.1% by weight, Si: 0.02% by weight, Mn: 0.5% by weight, P: 0.09% by weight, S: 0.011% by weight, Nb: 0.03% by weight , Al: 0.02% by weight, and the balance is iron) After soaking at 1250°C, rough roll into a 32mm thick intermediate billet with a rough rolling mill, and the final rolling temperature of the rough rolling is 1100°C; then roll a 3mm hot billet with a finish rolling mill For strip steel rolling, the final rolling temperature of finish rolling is 920°C; after finish rolling, it is cooled to 650°C at a rate of 100°C / s, and then cooled to 550°C at a rate of 20°C / s, and then enters the coiler to be coiled. roll. After the strip is cooled to room temperature (25°C), cut the edge with a disc, control the width at 1252mm, pickle it with hydrochloric acid with a concentration ...

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PUM

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Abstract

The invention provides a production method of a hot dipped steel coil. The method comprises steps of hot rolling, cold rolling, annealing, galvanizing and straightening on a billet. The batching temperature of the hot rolling is 500-550 DEG C; and the billet contains, calculated by a total weight of the billet, 0.04-0.1 wt% of carbon, 0.2-0.5 wt% of manganese, 0.06-0.09 wt% of phosphorus and 0.015-0.03 wt% of niobium. The method provided by the invention can obtain structural hot dipped steel coil with high width precision, and yield strength level of grade 350M Pa.

Description

technical field [0001] The invention relates to a production method of a hot-dip steel coil. Background technique [0002] Coated steel sheets are divided into structural coated steel sheets and punched coated steel sheets. The structural coated steel plate requires certain strength and plasticity, as well as a lower yield ratio to improve the seismic performance. Structural coated steel plate is the main raw material of coated products for construction and color-coated steel plate for structural use, and its yield strength grades are 280MPa, 320MPa and 350MPa. In order to meet the needs of subsequent processing, structural coated steel sheets are generally delivered in coils, and have high requirements for width accuracy. Taking a hot-dip steel sheet with a width of 1250mm as an example, the allowable deviation of the advanced precision of the width is 0-2mm. The allowable deviation of general accuracy is 0-6mm; width accuracy = actual width of hot-dip steel coil - user's...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D8/02C23C2/06C23C2/40C22C38/12
Inventor 郑之旺王敏莉刘庆春梁英周一林汤佩林
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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