Production method for high-strength hot-dip galvanized steel sheets and production method for high-strength alloyed hot-dip galvanized steel sheets

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in hot-dip galvanizing process, manufacturing tools, chemical instruments and methods, etc., can solve the problems of inability to remove Cr oxide, and the appearance of steel plate plating is not improved, and achieves the goal of galvanizing. Excellent cover adhesion and improved fuel consumption

Active Publication Date: 2016-03-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 3, electrolytic treatment is not performed, so Cr oxides cannot be removed, and the appearance of plating of steel sheets containing Cr is not improved.

Method used

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  • Production method for high-strength hot-dip galvanized steel sheets and production method for high-strength alloyed hot-dip galvanized steel sheets
  • Production method for high-strength hot-dip galvanized steel sheets and production method for high-strength alloyed hot-dip galvanized steel sheets
  • Production method for high-strength hot-dip galvanized steel sheets and production method for high-strength alloyed hot-dip galvanized steel sheets

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Experimental program
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Effect test

no. 1 approach ＞

[0028] First, a steel plate as a raw material used in the production method according to the first embodiment of the present invention will be described. The steel sheet as a raw material contains C: 0.040% to 0.500%, Si: 1.00% or less, Cr: 0.10% to 2.00%, Mn: 5.00% or less, P: 0.100% or less, S: 0.0100% or less in mass % , Al: 0.100% or less, and the remainder is composed of Fe and unavoidable impurities. In addition, in addition to the above-mentioned components, in terms of mass %, it may further contain Mo: 0.01% to 0.50%, Nb: 0.010% to 0.100%, B: 0.0001% to 0.0050%, and Ti: 0.010% to 0.100%. At least 1 element. In addition, in addition to the above-mentioned components, in terms of mass%, it may further contain Cu: 1.00% or less, V: 0.500% or less, Ni: 0.50% or less, N: 0.0100% or less, Sb: 0.10% or less, Sn: 0.10% % or less, Ca: 0.0100% or less, and REM: 0.010% or less. Hereinafter, each component is demonstrated.

[0029] C: 0.040% to 0.500%

[0030] C is an elemen...

no. 2 approach ＞

[0090] First, a steel plate as a raw material used in the production method according to the second embodiment of the present invention will be described. The steel sheet as a raw material contains C: 0.040% to 0.500%, Si: 1.00% or less, Cr: 0.10% to 2.00%, Mn: 8.00%, P: 0.100% or less, S: 0.0100% or less, Al: 0.100% or less, and the remainder consists of Fe and unavoidable impurities. In addition, the above-mentioned steel sheet may contain at least one element selected from the group consisting of Mo: 0.01% to 0.50%, Nb: 0.010% to 0.100%, B: 0.0001% to 0.0050%, and Ti: 0.010% to 0.100% in mass % . In addition, in terms of mass%, Cu: 1.00% or less, V: 0.500% or less, Ni: 0.50% or less, N: 0.0100% or less, Sb: 0.10% or less, Sn: 0.10% or less, Ca: At least one element of 0.0100% or less and REM: 0.010% or less.

[0091] Components other than Mn are the same as those in the first embodiment, and therefore descriptions of components other than Mn are omitted. In addition, si...

no. 3 approach ＞

[0101] First, a steel plate as a raw material used in the manufacturing method according to the third embodiment of the present invention will be described. The raw steel sheet contains C: 0.040% to 0.500%, Si: 1.00% or less, Cr: 0.10% to 3.00%, Mn: 8.00% or less, P: 0.100% or less, S: 0.0100% or less, Al : 0.100% or less, the remainder is composed of Fe and unavoidable impurities. In addition, the above-mentioned steel sheet may contain at least one element selected from the group consisting of Mo: 0.01% to 0.50%, Nb: 0.010% to 0.100%, B: 0.0001% to 0.0050%, and Ti: 0.010% to 0.100% in mass % . In addition, in terms of mass%, Cu: 1.00% or less, V: 0.500% or less, Ni: 0.50% or less, N: 0.0100% or less, Sb: 0.10% or less, Sn: 0.10% or less, Ca: At least one element of 0.0100% or less and REM: 0.010% or less.

[0102] The above-mentioned steel sheet used in the third embodiment is almost the same as the steel sheet used as a raw material in the manufacturing method of the sec...

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Abstract

Provided are a production method for producing high-strength hot-dip galvanized steel sheets and a production method for producing high-strength alloyed hot-dip galvanized steel sheets having excellent plating adhesion and surface appearance, said methods inhibiting problems caused by oxides that form on the surfaces of steel sheets containing chromium. High-strength hot-dip galvanized steel sheets are produced according to a method provided with: a first heating step in which a steel sheet composed of specific components is maintained at a specific temperature for a specific time in an atmosphere having a specific H2 concentration and a specific dew point; a cooling step in which the steel sheet, after having passed through the first heating step, is cooled; an electrolytic treatment step in which the steel sheet, after having passed through the cooling step, is subjected to electrolytic treatment under specific conditions; a second heating step in which the steel sheet, after having passed through the electrolytic treatment step, is maintained at a specific temperature for a specific time in an environment having a specific H2 concentration and a specific dew point; and a plating step in which the steel sheet, after having passed through the second heating step, is subjected to hot-dip galvanizing.

Description

technical field [0001] The present invention relates to a method for manufacturing a high-strength hot-dip galvanized steel sheet having excellent surface appearance and coating adhesion, and a method for manufacturing a high-strength alloyed hot-dip galvanized steel sheet suitable for use in automobile parts. Background technique [0002] In recent years, due to the increasing awareness of global environmental protection, there has been a strong demand to reduce CO 2 emissions and improve fuel consumption. At the same time, initiatives to increase the strength of steel sheets used as materials for vehicle body components to achieve thinner vehicle body components and to reduce the weight of vehicle bodies are increasing. However, the increase in the strength of the steel sheet may lower the ductility. Therefore, development of high-strength and high-ductility steel sheets is desired. [0003] In order to increase the strength of the steel sheet, solid solution strengthen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C21D9/46C21D9/48C22C38/00C22C38/38C22C38/60C23C2/06C23C2/28C23G1/08C25F1/00
CPCC23C2/02C23C2/06C21D9/46C22C38/00C22C38/60C25F1/06B32B15/013C22C18/00C21D1/76C21D6/004C21D6/005C21D6/008C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58C21D8/0473C21D8/0273C23C2/29C23C2/024C23C2/0224C23C2/285C23C2/28C22C38/38C23C2/40C23C10/02C23C10/28
Inventor 宫田麻衣铃木善继长泷康伸
Owner JFE STEEL CORP
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