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Method for producing coated steel sheet

A manufacturing method and technology for coating steel plates, applied to the surface coating liquid device, coating, metal material coating process, etc., can solve the problem of coating film damage, core material magnetic property damage, unavoidable cost increase, etc. problems, to achieve the effect of preventing uneven coating and preventing flash rust

Inactive Publication Date: 2005-07-20
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] However, the method (1) has good punchability and weldability at the same time, but the magnetic properties of the obtained core material are impaired because the space factor at the time of lamination is reduced.
The methods (2), (3) are not yet able to achieve both excellent TIG weldability comparable to inorganic coatings and excellent punching properties comparable to organic coatings, and further improvement is needed
The method of (4) performs a series of steps of applying the coating liquid for coating film twice and then baking, which is called 2-coating 2-baking, so there is a problem of increased manufacturing costs and the like.
The method of (5) limits the applicable resin and inorganic components, so it is still unavoidable to increase the cost
In this case, the coating film is partially destroyed due to the strain introduction treatment, and there is a problem that the coating film performance deteriorates.

Method used

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  • Method for producing coated steel sheet
  • Method for producing coated steel sheet
  • Method for producing coated steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0181] The raw material steel for cold-rolled steel sheets is smelted, hot-rolled, and then annealed for hot-rolled sheets if necessary. Then implement cold rolling to make a cold-rolled steel strip with a thickness of 0.5mm, a width of 1m, and Ra0.3μm, and then 2 :N 2 =30:70 atmosphere at 900°C for annealing. The water-based coating liquid having the composition shown in Table 6 was coated on each of the annealed raw steel plates. The conditions of coating, drying and baking are shown in Table 7 together with the evaluation of the obtained products. Coating film thickness (average dry area weight on one side) is specified as 0.1-6g / m 2 . The area weight was adjusted by changing the concentration of the coating solution (from 0.5% by mass to 30% by mass).

[0182] Here, the composition of the steel sheet is: C: 0.012% by mass, Si: 0.009% by mass, Mn: 0.14% by mass, Al: 0.032% by mass, other minor elements, and the balance iron.

[0183] The presence or absence of resin e...

Embodiment 2

[0192] According to the usual method, that is, the steel slabs with the specified components are subjected to the steps of hot rolling-hot-rolled sheet annealing-cold rolling-intermediate annealing-cold rolling-final annealing in the above order, and the steel sheet containing Si: 0.35% by mass, Al: 0.001 Mass % and Mn: 0.1 mass %, the balance is Fe and unavoidable impurities, an isotropic electrical steel sheet (raw material steel sheet) having a thickness of 0.5 mm and an Ra of 0.4 μm. Here, the attained temperatures in the hot-rolled sheet annealing, intermediate annealing, and final annealing were set to 1000°C, 900°C, and 1000°C, respectively.

[0193]On the surface (both sides) of the above-mentioned electrical steel sheet cooled to 30°C, a roll coater is used to apply a water-based coating solution in which magnesium dichromate: 50% by mass, acrylic acid is mixed in terms of solute components and dispersoid components. / Styrene resin emulsion (particle diameter 200nm, ...

Embodiment 3

[0211] Using the same procedure as in Example 1, a steel sheet with a plate thickness of 0.35 mm and a Ra of 0.3 μm was obtained, which contained Si: 3.0% by mass, Al: 0.001% by mass, and Mn: 0.1% by mass, with the balance being Fe and unavoidable impurities. Electromagnetic steel sheet (billet steel sheet).

[0212] On the surface (both sides) of the above-mentioned electrical steel sheet cooled to 40°C, a roll coater was used to apply a water-based coating solution in which colloidal silica: 60% by mass, Dispersible epoxy resin (particle diameter: 500 nm): 40% by mass (expressed by mass ratio, water: the above-mentioned solute·dispersate component = 95:5). Thereafter, the induction heating method or the hot air furnace heating method are used to perform drying and baking treatment to reach a plate temperature of 200°C respectively, and an insulating coating film with an average surface weight of 0.8g / m2 is coated on the basis of dry area weight. Other coating conditions are...

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Abstract

In a process for manufacturing a coated steel sheet such as a coated electromagnetic steel sheet using a water-based coating liquid containing an organic resin, to perform steps subsequent to an annealing step continuously at high speed without causing appearance defects such as coating unevenness; to provide an electromagnetic steel sheet having an insulating film thereon, in which properties of the film are satisfactory, superior weldability and punchability can be obtained without deteriorating the space factor, and the satisfactory film properties can be maintained even if the electromagnetic steel sheet having the insulating film thereon is temper-rolled. A coating liquid is applied onto an untreated steel sheet as settle means of the invention. The applied liquid is heated on the side close to the steel sheet in such a manner that the time elapsed until the steel sheet temperature is increased to 100 DEG C. after the application is completed is 10 seconds or less, thereby drying the coating liquid. The steel sheet temperature is further increased to a predetermined temperature, thereby forming a coating film. When insulating films for electromagnetic steel sheets are formed, the coating liquid preferably further contains a water based inorganic component.

Description

technical field [0001] The present invention relates to a coated steel sheet, and more particularly to a method for producing a coated steel sheet by applying a resin-containing water-based paint to the steel sheet, drying it, and then baking it to obtain excellent coating film properties such as high efficiency and good appearance. [0002] The present invention also relates to a method for producing an isotropic (nonoriented) electrical steel sheet having an insulating coating film having excellent coating film properties by applying the above method. Background technique [0003] After cold-rolled steel sheets and electrical steel sheets are rolled to their final thickness, they are generally subjected to high-temperature final annealing in a reducing atmosphere, and then painted as necessary to produce final products. There are various types of coatings, but water-based paints containing organic resins are widely used. In addition, there are various types of coating met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/02B05D7/14C21D8/02C21D8/04C21D8/12C23C22/74H01F1/147H01F1/18
CPCB05D7/14C23C22/74B05D2202/10C21D8/0484H01F1/14725C21D8/1283C21D8/0284H01F1/18B05D3/0209C21D8/1233C23C22/73
Inventor 小森优佳河野正树佐志一道藤田明男
Owner JFE STEEL CORP
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