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Method for producing alloyed hot-dipping galvanized steel sheet

A technology of hot-dip galvanized steel sheet and production method, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve problems such as deterioration of corrosion resistance, coating powdering and peeling, surface defects, etc., to achieve The effect of excellent corrosion resistance, good welding performance and coating performance

Inactive Publication Date: 2008-09-03
MAANSHAN IRON AND STEEL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet these characteristics, some domestic iron and steel enterprises have developed alloyed hot-dip galvanized steel sheets. The production method of alloyed hot-dip galvanized steel sheets is to heat the hot-dip galvanized steel sheets in an alloying furnace at about 500°C after galvanizing. The alloying reaction between the surface pure zinc layer and the steel substrate forms an alloyed coating composed of Fe-Zn compounds, but the corrosion resistance, blackening resistance, and electrical conductivity of the alloyed hot-dip galvanized steel sheet are poor, and in The coating is prone to powdering and peeling during stamping deformation, and the galvanized layer is easily damaged, which not only deteriorates the corrosion resistance, but also easily causes surface defects, affecting the appearance after coating
Chinese patent: 02801081.7 introduces a production method of alloyed hot-dip galvanized steel sheet, but the steel sheet produced by it has the disadvantages of poor corrosion resistance, blackening resistance, and lubricating performance. Promulgated the "Waste Electrical and Electronic Equipment Directive" (WEEE-2002 / 96 / EC) and the "Directive on Prohibition of the Use of Certain Hazardous Substances in Large Electrical and Electronic Equipment" (RoHS-2002 / 95 / EC). From January 1, the sale of electronic and electrical equipment containing harmful substances such as Hg, Cd, Cr6+, Pb, PPBs, and PBDEs is prohibited in the EU market
However, general zinc-iron alloy products usually use non-passivation or hexavalent chromium passivation, which seriously affects their performance and environmental protection requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A production method of an alloyed hot-dip galvanized steel sheet, comprising a strip steel production process, a strip steel galvanizing process, an alloying process, a smoothing process, and a passivation process:

[0028] The strip galvanizing process is as follows: the temperature of the strip entering the zinc pot is 470°C, the temperature of the zinc solution is 460°C; the zinc solution contains the following substances and mass percentages: Al: 0.14%, Pb≤0.003%, Fe: 0.05%, other elements ≤ 0.003%, in the galvanized layer, the δ1 phase of iron is FeZn 8 , the Γ1 phase at the δ1 / steel matrix interface is Fe 3 Zn 10 .

[0029] The alloying process is as follows: the temperature of the alloying furnace is controlled at 490°C, and the alloying time is controlled at 10-15s;

[0030] The smoothing process is as follows: the alloyed steel strip is cooled to below 40°C, and then sent to a skin pass mill, so that the alloyed steel strip has a roughness of Ra0.8μm and an ...

Embodiment 2

[0033] A production method of an alloyed hot-dip galvanized steel sheet, comprising a strip steel production process, a strip steel galvanizing process, an alloying process, a smoothing process, and a passivation process:

[0034] The strip galvanizing process is as follows: the temperature of the strip entering the zinc pot is 465°C, the temperature of the zinc solution is 455°C; the zinc solution contains the following substances and mass percentages: Al: 0.13%, Pb≤0.003%, Fe: 0.04%, the remaining impurity elements ≤ 0.003%, in the galvanized layer, the δ1 phase of iron is FeZn 9 , the Γ1 phase at the δ1 / steel matrix interface is Fe 3 Zn 10 .

[0035] The alloying process is as follows: the temperature of the alloying furnace is controlled at 500°C, and the alloying time is controlled at 10-15s;

[0036] The smoothing process is as follows: the alloyed steel strip is cooled to below 40°C, and then sent to a skin pass mill, so that the alloyed steel strip has a roughness o...

Embodiment 3

[0039] A production method of an alloyed hot-dip galvanized steel sheet, comprising a strip steel production process, a strip steel galvanizing process, an alloying process, a smoothing process, and a passivation process:

[0040] The strip galvanizing process is as follows: the temperature of the strip entering the zinc pot is 465°C, the temperature of the zinc solution is 455°C; the zinc solution contains the following substances and mass percentages: Al: 0.12%, Pb≤0.003%, Fe: 0.03%, the remaining impurity elements ≤ 0.003%, in the galvanized layer, the δ1 phase of iron is FeZn 10 , the Γ1 phase at the δ1 / steel matrix interface is Fe 3 Zn 10 .

[0041] The alloying process is as follows: the temperature of the alloying furnace is controlled at 500°C, and the alloying time is controlled at 10-15s;

[0042] The smoothing process is as follows: the alloyed steel strip is cooled to below 40°C, and then sent to a skin pass mill, so that the alloyed steel strip has a roughness ...

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Abstract

The present invention discloses a production method for an alloyed hot-dip galvanizing steel plate, comprising the processes of strip steel producing, strip steel galvanizing, alloying, leveling and passivating, wherein in the strip steel galvanizing process, the temperature of strip steel entering a galvanized pot is 450 to 470 DEG C, and the temperature of zinc liquid is 455 to 465 DEG C. Compared with current technology, the method can produce a steel plant which not only has good welding property and coating property of a traditional alloyed hot-dip galvanizing steel plate, but also has superior corrosion-resistant property, black -patina-resistant property, conductivity and environment protecting property, and is particularly suitable for manufacturing kinescopes.

Description

technical field [0001] The invention relates to a production method of an alloyed hot-dip galvanized steel sheet, in particular to a production method of an environment-friendly zinc-iron alloyed hot-dip galvanized steel sheet used for a television picture tube. Background technique [0002] The production method of hot-dip galvanized steel sheet has experienced the evolution process of the early Sendzimir process, the improved Sendzimir process and the United States steel process. Affected by the production process, it is difficult for the products produced by the improved Sendzimir process to meet the requirements of alloyed steel plates regardless of their surface quality (including spangle structure) or the range of steel types that can be produced; in addition, the post-treatment section of the Sendzimir process The production of environmentally friendly alloyed hot-dip galvanized steel sheets is generally not considered in the design, so the equipment configuration in ...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/40
Inventor 杨兴亮刘劼赵云龙胡士幸章一樊叶明成
Owner MAANSHAN IRON AND STEEL COMPANY
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