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Process for producing alloyed hot-dip zinc-plated steel sheet and alloyed hot-dip zinc-plated steel sheet

A technology of hot-dip galvanized steel sheet and manufacturing method, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of unstable stamping performance, peeling, and high load, and achieve excellent stamping formability, sliding Low resistance effect

Active Publication Date: 2011-10-26
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is a problem that in a film with a high Fe concentration, a hard and brittle Γ phase is easily formed at the plating-steel plate interface, and the phenomenon of peeling from the interface during processing, that is, the so-called powdering (powdering) is likely to occur.
However, in this method, there are problems that due to the high viscosity of lubricating oil, coating defects due to poor degreasing occur in the coating process, and stamping performance becomes unstable due to oil cut-off during stamping, etc.
[0016] However, Patent Documents 1 to 6 are effective for relatively low-strength alloyed hot-dip galvanized steel sheets that are often used in automobile outer panels, but the load during press forming is high, so the pressure on the contact surface with the metal mold increases. In high-strength alloyed hot-dip galvanized steel sheets, the effect of improving the press formability may not be obtained stably

Method used

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  • Process for producing alloyed hot-dip zinc-plated steel sheet and alloyed hot-dip zinc-plated steel sheet
  • Process for producing alloyed hot-dip zinc-plated steel sheet and alloyed hot-dip zinc-plated steel sheet
  • Process for producing alloyed hot-dip zinc-plated steel sheet and alloyed hot-dip zinc-plated steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0058] When an acidic solution containing Zr is used, an oxide layer containing Zn and Zr can be formed on the regulated part and the non-regulated part, and since Zr is harder than Zn, it is different from the oxide layer of Zn alone. than, a more hardened oxide layer can be formed. The oxide layer thus formed is not easily broken even when the contact surface pressure with the metal mold is high, and direct contact of the metal mold with the plating surface is suppressed. As a result, good press formability can be exhibited even in high-strength galvannealed steel sheets that are prone to die wear due to high forming loads.

[0059] The formation mechanism of this oxide layer is not clear, but it is considered as follows. When the galvannealed steel sheet is brought into contact with an acidic solution, zinc dissolves from the steel sheet side. It can be considered that since the dissolution of zinc generates hydrogen at the same time, when the dissolution of zinc proceeds...

Embodiment

[0074] Next, the present invention will be described in more detail using examples.

[0075] On a cold-rolled steel sheet with a thickness of 0.8 mm, a conventional galvannealed film was formed, followed by temper rolling. Next, as an oxide formation treatment, immersion was carried out for 3 seconds in an acidic aqueous solution of 40 g / l of sodium acetate, in an acidic solution in which the concentration of Zr ions and the temperature of the solution were appropriately changed. Thereafter, roll pressing was carried out, and after adjusting the liquid volume, the mixture was kept in the atmosphere at room temperature for 1 to 60 seconds, washed with water sufficiently, and then dried.

[0076] Next, with respect to the steel sheet produced as above, the film thickness of the oxide layer in the pressure-regulated portion and the non-pressure-regulated portion of the plated surface layer was measured, and at the same time, the friction coefficient was measured as a method for s...

Embodiment approach 2

[0094] When an acidic solution containing Ti is used, an oxide layer containing Zn and Ti can be formed on the pressure-regulated part and the non-pressure-regulated part, and Ti is harder than Zn, so compared with the oxide layer of Zn alone , can form a more hardened oxide layer. The oxide layer thus formed is not easily broken even under high pressure at the contact surface with the metal mold, and inhibits direct contact of the metal mold with the plating surface. As a result, good press formability can be exhibited even in high-strength galvannealed steel sheets that are prone to die wear due to high forming loads.

[0095]The formation mechanism of this oxide layer is not clear, but it is considered as follows. When the galvannealed steel sheet is brought into contact with an acidic solution, zinc dissolves from the steel sheet side. It can be considered that since the dissolution of zinc generates hydrogen at the same time, when the dissolution of zinc proceeds, the c...

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Abstract

A method of manufacturing a hot dip galvannealed steel sheet, including the steps of: subjecting a steel sheet to hot dip galvanizing to manufacture a hot dip galvanized steel sheet; heating the hot dip galvanized steel sheet for alloying; subjecting the hot dip galvanized steel sheet to temper rolling; bringing the temper-rolled hot dip galvanized steel sheet into contact with an acid solution containing at least one ion selected from the group consisting of Zr ions, Ti ions, and Sn ions to thereby form an acid solution film on the surface of the steel sheet; after completion of the contact,a state where the acid solution film is formed on the surface of the steel sheet is held for at least 1 second; and washing with water the hot dip galvanized steel sheet after holding, to thereby form a Zn oxide layer having a thickness of 10 nm or more on the surface of the galvanized steel sheet. The hot dip galvannealed steel sheet has an oxide layer having an average thickness of 10 nm or more on the surface of the plated steel sheet.

Description

technical field [0001] The present invention relates to a method for producing a galvannealed steel sheet, which has a high forming load and is easy to form even on a high-strength galvannealed steel sheet, and a galvannealed steel sheet. It also has excellent press formability in materials that cause die galling. Background technique [0002] Alloyed hot-dip galvanized steel sheet has excellent weldability and paintability compared to galvanized steel sheet without alloying treatment, so it is widely used in a wide range of fields, mainly for automobile body applications. use. The galvannealed steel sheet used in this application is press-formed and used. However, galvannealed steel sheets have a disadvantage of poor press formability compared to cold-rolled steel sheets. The reason for this is that the sliding resistance of the alloyed hot-dip galvanized steel sheet in the stamping die is larger than that of the cold-rolled steel sheet. That is, the galvannealed steel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/26C23C2/06C23C2/28C23C22/53
Inventor 增冈弘之平章一郎杉本芳春吉见直人名越正泰谷本亘
Owner JFE STEEL CORP
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