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Process for producing hot-dip galvanized steel sheet with zinc phosphate coat

A technology of hot dip galvanizing and manufacturing method, applied in the direction of metal material coating process, etc., can solve problems such as insufficient performance, and achieve the effects of improving stability, improving productivity and easy adjustment

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

AI Technical Summary

Problems solved by technology

[0026] Furthermore, among the steel sheets having an inorganic lubricating film described in Patent Document 9, especially in the case of an amorphous phosphate-based film, there is a possibility that the performance may be insufficient during processing, especially in forming or sliding tests where high surface pressure is applied.

Method used

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  • Process for producing hot-dip galvanized steel sheet with zinc phosphate coat
  • Process for producing hot-dip galvanized steel sheet with zinc phosphate coat
  • Process for producing hot-dip galvanized steel sheet with zinc phosphate coat

Examples

Experimental program
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Effect test

Embodiment 1

[0132] As Example 1, for a plate thickness of 0.8 mm, a cut plate of 200 mm × 250 mm, that is, an extremely low carbon steel plate GI steel plate (plating adhesion amount 90 g / m 2 , film Al concentration: 0.4% by mass, Fe concentration: 1.5% by mass) and GA steel plate (plating adhesion: 60g / m 2 , film Al concentration: 0.30% by mass, and Fe concentration: 9.5% by mass) were evaluated for operability and lubricity for these two types of hot-dip galvanized steel sheets. In this example, the evaluation was performed by the presence or absence of the above-mentioned pre-drying step when the components of the surface conditioner and the components of the treatment agent were changed. Table 1 and Table 2 show the components of the surface treatment agent and the components of the treatment agent, respectively.

[0133] (Table 1) Components contained in the surface conditioner

[0134]

[0135] (Table 2) Components contained in the treatment agent

[0136] no

[Zn]...

Embodiment 2

[0202] Embodiment 2 is by continuous hot-dip galvanizing class steel plate production line, to the GA steel plate (extremely low carbon steel plate, plating adhesion 45g / m2) of plate thickness 0.8mm 2 , film Al concentration: 0.25% by mass, Fe concentration: 9.0% by mass) was smoothed (rolling rate 1.0%), and in the surface conditioner supply process, No. 1, 4, and 6 surface conditioners shown in Table 1 were supplied , The treatment agent process uses the treatment agents a, d, e and i in Table 2 for zinc phosphate film treatment.

[0203] Surface conditioner supply process

[0204] Supply Method: Spray or Roller

[0205] Drying equipment: dryer

[0206] Adhesion amount: 3mg / m in P conversion 2

[0207] pre-drying process

[0208] Drying temperature: the highest temperature of the steel plate is 70°C

[0209] Drying time: 5 seconds

[0210] Treatment agent supply process:

[0211] Supply method: Roller coating (invasion agent temperature 50°C)

[0212] post-drying pr...

Embodiment 3

[0270] Utilizing FCL4480 (20g / L, 45°C) manufactured by Nippon Parka Raiding Co., Ltd., spray degreasing for 30 seconds on both sides of an ultra-low carbon steel plate with a plate thickness of 0.8mm, and then perform degreasing. Washed and dried and made into test panels. Thereafter, the surface conditioner supply (S1) to the post-drying process (S4) are implemented to manufacture a galvanized steel sheet having a zinc phosphate film. Furthermore, various evaluations were performed on the galvanized steel sheet having the zinc phosphate film. Hereinafter, conditions, evaluation items, and results will be described. In addition, as a comparison, a steel plate subjected to only the surface conditioner supply process (S1) and a pre-drying process (S2), and a steel plate subjected to only a treatment agent supply process (S3) and a post-drying process (S4) were produced. In addition, as a current example, an electroplating layer with a composition of 80% by mass Zn was formed o...

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Abstract

A process for producing a hot-dip galvanized steel sheet with zinc phosphate coat, which realizes stabilizing of the composition balance of treating agent and realizes reducing of production cost and lessening of influences on environment. A galvanized steel sheet with zinc phosphate coat excelling in lubricity and adherence is provided through the process. There is provided a process for continuously producing a hot-dip galvanized steel sheet with zinc phosphate coat, comprising the surface regulating agent supply step of feeding a surface regulating agent onto a hot-dip galvanized surface; the predrying step of drying the surface regulating agent as a post-step of the surface regulating agent supply step; and the treating agent supply step of feeding a treating agent containing an aqueous solution of zinc phosphate onto the hot-dip galvanized surface as a post-step of the predrying step.

Description

technical field [0001] The present invention relates to a method for producing a hot-dip galvanized steel sheet for improving press formability in the automotive field and the like and having excellent lubricity and / or adhesion. In detail, the present invention relates to a method for producing a hot-dip galvanized steel sheet having a zinc phosphate film, and in a continuous hot-dip galvanized steel sheet production line, it is also possible to realize the operability of manufacturing a hot-dip galvanized steel sheet having the above-mentioned properties. Represents increased productivity. Background technique [0002] In recent years, galvanized steel sheets have been used as antirust measures for steel sheets used in automobiles and the like. When used in automobiles in many cases, the galvanized steel sheet is press-formed. However, it is well known that galvanized steel sheets are inferior in press formability compared to cold-rolled steel sheets. This is because the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/12C23C22/78
CPCC23C22/12
Inventor 石垣一高桥克川西胜次黑田亨西原克浩
Owner NIPPON STEEL CORP
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