Manufacturing method of high-strength hot-dip galvanized steel sheet and manufacturing method of high-strength alloyed hot-dip galvanized steel sheet

A technology of hot-dip galvanized steel sheet and manufacturing method, applied in the direction of hot-dip galvanizing process, manufacturing tools, chemical instruments and methods, etc., can solve the problems that the appearance of steel sheet plating is not improved, Cr oxide cannot be removed, etc., and achieve the goal of galvanizing Excellent coating adhesion and improved fuel consumption

Active Publication Date: 2019-05-07
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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  • Manufacturing method of high-strength hot-dip galvanized steel sheet and manufacturing method of high-strength alloyed hot-dip galvanized steel sheet
  • Manufacturing method of high-strength hot-dip galvanized steel sheet and manufacturing method of high-strength alloyed hot-dip galvanized steel sheet
  • Manufacturing method of high-strength hot-dip galvanized steel sheet and manufacturing method of high-strength alloyed hot-dip galvanized steel sheet

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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

The present invention provides a method for producing a high-strength hot-dip galvanized steel sheet that can suppress problems caused by oxides formed on the surface of the steel sheet in a Cr-containing steel sheet, and is excellent in plating adhesion and surface appearance. A method for manufacturing high-strength alloyed hot-dip galvanized steel sheets. It is to manufacture high-strength hot-dip galvanized steel sheets by a method with the following steps, which includes: a first heating step, in a specific H 2 Concentration, a specific dew point atmosphere, the steel plate with a specific composition is kept at a specific temperature for a specific time; the cooling process is to cool the steel plate after the first heating process; the electrolytic treatment process is to cool the steel plate under specific conditions. After the steel plate is electrolytically treated; the second heating process, in a specific H 2 Concentration, specific dew point atmosphere, the steel plate after the electrolytic treatment process is kept at a specific temperature for a specific time; the plating treatment process is to perform hot-dip galvanizing treatment on the steel plate after the second heating process.

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