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Method for producing hot-dipped steel sheet excellent in blackening resistance and corrosion resistance

A manufacturing method and hot-dip plating technology, applied in hot-dip plating processes, manufacturing tools, heat treatment furnaces, etc., can solve the problems of coarsening of the coating structure, low solubility, long time, etc., and achieve difficult color difference, uniform distribution, and surface. in good condition

Active Publication Date: 2021-01-08
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low solubility of Ti in Zn, it often takes a long time to add a small amount of Ti, and Ti will also coarsen the coating structure.

Method used

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  • Method for producing hot-dipped steel sheet excellent in blackening resistance and corrosion resistance
  • Method for producing hot-dipped steel sheet excellent in blackening resistance and corrosion resistance
  • Method for producing hot-dipped steel sheet excellent in blackening resistance and corrosion resistance

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] After the basic steel plate is hot-rolled and cold-rolled, it enters the annealing furnace and the zinc pot in turn to produce Mg-containing hot-dip galvanized steel plate. In all the examples below, the plating solution includes 2.5% to 23% of Al, 2.5% to 12% of Mg and the remainder Zn by weight percentage, and unavoidable impurities; the process parameters of the annealing furnace are shown in Table 1 where the hydrogen content is volume Percentage, the plating solution composition is weight percent. The microstructure of each coating was observed and counted by scanning electron microscope and energy dispersive spectrometer, as shown in Table 2.

[0026] Table 1

[0027]

[0028] Table 2

[0029]

[0030] As shown in Examples 1 to 6 in Table 2, in the embodiments of the annealing process parameters defined in the pr...

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Abstract

The invention discloses a manufacturing method for hot dipped steel plates excellent in blackening resistance and corrosion resistance. The manufacturing method comprises the following steps: increasing the oxygen partial pressure in an annealing furnace to 30-80 ppm when basic strip steel enters a preheating section of the annealing furnace, wherein the dew point of the preheating furnace is 0-50DEG C, the furnace pressure of the annealing furnace is 300-500 Pa, and the preheating temperature is 500-700 DEG C; controlling the dew point of a soaking section at 30 DEG C below zero to 30 DEG Cafter the basic strip steel enters the soaking section, wherein the hydrogen content in percent by volume is 15-25%; and finally, controlling the cooling speed at 20-100 DEG C / s for cooling, wherein the basic strip steel enters a zinc pot to produce Mg-containing hot dipped steel plates. Mg-enriched ternary eutectic phase sheets in coatings of the steel plates are small in interlayer spacing, relatively short and uniform in distribution, Mg-containing oxides are unlikely produced, and the hot dipped steel plates have high corrosion resistance and good blacken resistance. In a severe environment, the corrosion resistance of the coatings is 2-3 times of that of conventional hot dipped steel plates, or the corrosion resistance is even higher, and the quality of the surface tissues of the coatings is good.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanizing, in particular to a method for manufacturing a hot-dip galvanized steel sheet with excellent blackening resistance and corrosion resistance. Background technique [0002] Galvanizing is the most common and effective method for steel anticorrosion. However, with the continuous improvement of the requirements for the corrosion resistance of steel products, hot-dip pure galvanizing has gradually been unable to meet the requirements. Adding a small amount of Mg element in the Zn-Al alloy coating can greatly improve the anti-corrosion performance of the zinc-based coating. Hot-dip Zn-Al-Mg alloy coating has broad application prospects due to its good corrosion resistance and damage resistance. [0003] Blackening is a prominent problem that may exist in galvanized steel sheets, especially in Mg-containing coatings. The reasons mainly include the following points: 1) the anodic active diss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C23C2/06C21D1/26C21D1/74C21D9/52
CPCC21D1/26C21D1/74C21D9/52C23C2/02C23C2/06
Inventor 方芳金鑫炎陈一鸣胡宽辉杜小峰
Owner 武汉钢铁有限公司
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