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Production method of high-strength hot-dip galvanizing steel strip

A technology of hot-dip galvanizing and production methods, which is applied in the direction of hot-dip galvanizing, coating, metal material coating technology, etc., can solve the problems of low strength, slow cooling speed, and difficult cooling speed of galvanized sheets, and achieve the best results Good stability, improved strength, simple and easy method

Inactive Publication Date: 2013-08-07
重庆万达薄板有限公司
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Problems solved by technology

Therefore, it is difficult for the former to increase the cooling rate, and it is not possible to use cooling media such as water that can chemically react with steel. With the heat on the surface, the cooling rate is slower, the grains after crystallization are larger, and the strength of the final galvanized sheet is lower

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  • Production method of high-strength hot-dip galvanizing steel strip

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Embodiment Construction

[0011] Please see accompanying drawing, in one embodiment of the present invention, steel strip (1) enters heating furnace along steel strip running direction (2) and carries out annealing treatment, at first in heating furnace heating zone (3), be heated to about 700- 800 ℃, and after being kept at the above temperature for a period of time in the heating furnace holding section (4), it enters the heating furnace cooling section (5), which is the relevant area of ​​the present invention. The present invention adopts that a plurality of spray nozzles (6) and other additional devices are arranged on the upper and lower sides of the steel strip (1) in the cooling section (5) of the heating furnace, so that the steel strip (1) can be sprayed from the upper and lower directions without causing the steel The cooling medium that produces oxidation, the cooling medium selected by the present invention is liquid at the ambient temperature, and will immediately vaporize when sprayed on ...

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Abstract

The invention discloses a production method of a high-strength hot-dip galvanizing steel strip. According to the production method, after the steel strip is heated above a recrystallization temperature and is subjected to appropriate temperature preservation, a cooling medium incapable of causing the oxidation of the steel strip is sprayed on the surface of the high-temperature steel strip, wherein the cooling medium is liquid and can be vaporized at a high temperature to absorb lots of heat, thus the steel strip is rapidly cooled, the recrystallization change happens in very short time to generate very thin crystal particles, the effect of strength enhancement is achieved, and then the hot-dip galvanizing is carried out to produce the high-strength hot-dip galvanizing steel strip. The cooling medium can be but not limited to combustible materials such as hydrocarbon compounds, and if the cooling medium is the combustible material such as the hydrocarbon compound, the combustible material can be burned to assist steel strip heating during heating the steel strip and is fully utilized.

Description

technical field [0001] The invention relates to a production method of a hot-dip galvanized steel strip, in particular to a production method of a high-strength hot-dip galvanized steel strip. Background technique [0002] As is well known in the industry, hot-dip galvanized steel strips are obtained after degreasing, annealing, and hot-dip galvanizing of rolled hard plates in a continuous galvanizing production line. Strength is one of the main performance indicators of hot-dip galvanized steel strip. In order to save materials, the strength must be increased. The production of high-strength hot-dip galvanized steel strip is the development direction of the industry and is also a major problem. At present, the preferred way to increase the strength of hot-dip galvanized steel strip is to add alloying elements inside the steel, which will inevitably increase the difficulty and cost of smelting. Therefore, people began to increase the cooling rate after galvanizing, and trie...

Claims

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Application Information

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IPC IPC(8): C23C2/02C23C2/40C23C2/06
Inventor 许秀飞
Owner 重庆万达薄板有限公司
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