Manufacturing method of hot-dip galvanized steel sheet

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The method addresses the issue of groove marks on hot-dip galvanized steel sheets by heating the steel sheets to a specific temperature range after alkaline electrolytic cleaning, effectively removing residual oil and preventing groove marks while maintaining high corrosion resistance.

JP7647660B2Active Publication Date: 2025-03-18JFE STEEL CORP

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Patent Information

Application Number: JP2022066509
Authority / Receiving Office: JP · JP
Patent Type: Patents
Current Assignee / Owner
Filing Date: 2022-04-13
Publication Date: 2025-03-18
Estimated Expiration: 2042-04-13

Application Information

Patent Timeline

13 Apr 2022

Application

JP2022066509

18 Mar 2025

Publication

JP7647660B2

IPC: C23C2/02; C23C2/06

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Application Domain

Hot-dipping/immersion processes

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AI Technical Summary

Technical Problem

The generation of groove marks on the plating surface of hot-dip galvanized steel sheets due to excessive Al content in the plating bath, leading to poor appearance and inability to use the product.

Method used

A method for manufacturing hot-dip galvanized steel sheets involves passing the steel sheets through an alkaline electrolytic cleaning step at 90°C or higher, followed by heating using gas combustion heating to a temperature range of 650°C to 750°C to remove residual oil from the steel sheet surface, thereby preventing groove mark defects.

Benefits of technology

This method effectively suppresses the occurrence of groove marks on the steel sheets, maintaining the high corrosion resistance of Al while ensuring a clean and aesthetically pleasing surface finish.

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Abstract

To provide a production method of a high corrosion resistance galvanized steel sheet capable of utilizing high corrosion resistance of Al, and suppressing generation of a sink roll groove pattern, namely, a group mark.SOLUTION: In an alkali electrolytic cleaning step which is a previous step of hot dip galvanization, the surface of a steel sheet to be plated is defatted with alkali electrolytic cleaning liquid at a temperature of 90°C or higher, and further in a heating / cooling step, the steel sheet is heated in the range of 650°C or higher and 710°C or lower by using gas combustion heating, to thereby remove effectively oil in the surface of the steel sheet.SELECTED DRAWING: Figure 4

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