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Preparation technology of galvanized steel sheet with continuous hot-dip spangles

A galvanized steel sheet and preparation technology, which is applied in the field of galvanized steel sheet, can solve the problems of poor surface flatness, complex hot-dip process, and uneven spangles, and achieve smooth surface, low surface gloss, and uniform spangles Effect

Active Publication Date: 2017-05-24
重庆万达薄板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problems to be solved are: the existing hot-dip plating process is complex, difficult to operate, long production cycle, disorderly and uneven spangles, poor surface flatness, and poor anti-corrosion performance

Method used

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  • Preparation technology of galvanized steel sheet with continuous hot-dip spangles
  • Preparation technology of galvanized steel sheet with continuous hot-dip spangles
  • Preparation technology of galvanized steel sheet with continuous hot-dip spangles

Examples

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Embodiment Construction

[0028] Preparation Example

[0029] The preparation technology of continuous hot-dip galvanized steel sheet of the present invention comprises the following steps:

[0030] Step 1. Uncoiling and cleaning: the cold-rolled coil is uncoiled, the steel plate is sent to the welding machine and the inlet looper, and the surface of the steel plate is cleaned after chemical degreasing; chemical degreasing includes the following steps: spray cleaning with lye, and at the same time clean the surface of the steel plate After being squeezed dry, carry out secondary spray cleaning with clean water, and dry after squeezing dry; wherein, the thickness and width of the raw material steel plate are as shown in Table 1. Therefore, the carbon content of the steel plate is less than 0.12%;

[0031] Step 2, annealing: the steel plate enters the annealing furnace for reduction and calcination, and the annealing atmosphere is H 2 and N 2 The mixed gas, the annealing temperature is specifically sho...

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Abstract

The invention relates to the technical field of galvanizing of steel sheets, and discloses a preparation technology of a galvanized steel sheet with continuous hot-dip spangles. The preparation technology comprises the following steps of uncoiling, and cleaning; annealing: sending a steel sheet into an annealing furnace to reduce and calcine, wherein the annealing atmosphere is a H2 (hydrogen) and N2 (nitrogen) mixed gas, and the annealing temperature is 720 to 800 DEG C; hot-dip: cooling the steel sheet by air, cooling to 470 to 520 DEG C at the average temperature, sending into a zinc pot, and performing hot-dip, wherein the temperature of the zinc pot is 455 to 470 DEG C, and the content of antimony in the zinc pot is 0.7 to 1.0% (in percentage by mass); spraying: enabling an air knife to scrape the excessive hot-dip liquid on the steel sheet, spraying and cooling, wherein the temperature of spraying liquid is 55 to 60 DEG C, and the spraying liquid is a monosodium phosphate water solution; flattening, and passivating; coiling. The preparation technology has the advantages that the production cycle is short, the spangles are small and uniform, and the mechanical property and anticorrosive property of the prepared steel sheet are excellent.

Description

technical field [0001] The invention relates to the technical field of steel plate galvanizing, in particular to a preparation process of continuous hot-dip galvanized steel plate. Background technique [0002] Hot-dip galvanizing, also known as hot-dip galvanizing, is a method in which steel components are immersed in molten zinc to obtain a metal coating. In recent years, with the rapid development of high-voltage power transmission, transportation, and communication, the requirements for the protection of steel parts are getting higher and higher, and the demand for hot-dip galvanizing is also increasing. The traditional hot-dip galvanizing process has a long cycle and a complicated production process. The mechanical properties and anti-corrosion properties of the galvanized steel sheet produced are poor, and the cost is high. And when performing small spangle galvanizing, generally a small spangle machine is used to galvanize the steel plate with small spangles. In the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/46C23C2/06C23C2/40C23C2/20C23C2/26C23C22/68C23C22/73C23C28/00
Inventor 李春发林一兴权洋
Owner 重庆万达薄板有限公司
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