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Galvanized carbon steel with stainless steel-like finish

一种碳钢、有机物的技术，应用在叠加层的镀覆、制造工具、热浸镀工艺等方向，能够解决影响外观一致性材料耐蚀性、难生产等问题

Inactive Publication Date: 2013-05-01
AK STEEL PROPERTIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they are more difficult to produce because the grinding operation used to create the textured surface removes some or all of the galvanized coating
This affects the consistency of appearance and the corrosion resistance of the material

Method used

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  • Galvanized carbon steel with stainless steel-like finish
  • Galvanized carbon steel with stainless steel-like finish
  • Galvanized carbon steel with stainless steel-like finish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Electrogalvanized carbon steel strip can be processed on lines for polished stainless steel. The surface texture is obtained by contact with the abrasive belt. Usually texturing is limited to one surface. The speed of the steel belt, the speed of the grinding belt, the pressure applied, the nature and grain size of the abrasive, and the hardness of the material being processed all have an effect on the appearance of the polished product. Due to the softer nature of the zinc surface on electrogalvanized steel compared to stainless steel, adjustments are required to ensure that the zinc coating is not completely removed during polishing. Examination of zinc coating integrity on samples of coils processed in this manner found that approximately 50% of the zinc remained after processing in terms of coating weight. However, cross-sections of the processed material revealed isolated areas where the zinc coating was almost completely removed (Fig. 1). This polished carbon st...

example 2

[0032] A second test was performed using an electrogalvanized carbon steel strip, where the surface was continuously subjected to an abrasive brush type roller, rather than an abrasive belt. This procedure tends to be less aggressive in terms of zinc removal. However, this procedure can result in a visual appearance that deviates from the desired texture associated with typical polished stainless steel (Figure 3). By varying processing conditions such as relative roll and belt speeds, roll pressure, and roll grain size and texture, a more desired appearance can be developed. However, as with other grinding-based processes, there is the same concern that it is difficult to control the amount of zinc removed. Thus, it may be difficult to maintain uniform appearance and corrosion resistance. Visual inspection of the material after processing revealed that the surface texture developed and illustrated in Figure 3 was quite different from polished stainless steel, limiting the ma...

Embodiment 3

[0034] Performance evaluation tests were performed on samples of electrogalvanized carbon steel coils processed using a skin pass mill and subsequently coated with a clear polymer film. The amount of galvanized coating removed is minimal. The samples were tested for corrosion resistance and formability. the following in Image 6 Corrosion resistance results are shown in .

[0035] Wet / dry cyclic corrosion testing has shown that electrogalvanized steel with rolled texture finish features and organic coatings has less surface pitting than polished 430 stainless steel. Tests of samples without an organic coating also had pitting, but had areas of white rust typical of galvanized steel. The edges of the 4x6 inch samples were taped to eliminate the trimming effect, and the samples were immersed in a 5% saline solution for 15 minutes. The samples were then air dried for 90 minutes and placed in a humidity cabinet at 60°C for approximately 72 hours. The wet / dry portion of the cy...

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Abstract

A "faux stainless steel" may be produced by processing galvanized carbon steel through a temper mill using textured rolls to develop a "polished" type surface. The galvanized coating is not removed by abrasion but is compressed thereby providing a more uniform substrate than conventional polishing or brushing. The resulting strip may then be coated with an organic film to provide additional appearance and corrosion benefits including anti-fingerprint resistance.

Description

[0001] Cross References to Related Applications [0002] This application hereby claims the benefit of identically titled Provisional Patent Application Serial No. 61 / 378,194, filed August 30, 2010, the disclosure of which is hereby incorporated by reference in its entirety. Background technique [0003] Polished stainless steel is more expensive than carbon steel. At the same time, fingerprints and spots on manufactured stainless steel components such as kitchen utensils are not easy to remove. For these reasons, a number of low-cost "stainless look" alternatives have been developed, including painted carbon steel, polished or brushed hot-dip galvanized (HDG) or electrogalvanized (EG) carbon steel. However, painted products do not have the texture of polished stainless steel. Polished / brushed HDG / EG products have a grain more similar to polished stainless steel. However, they are more difficult to produce because the grinding operation used to create the textured surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/48C23C2/26
CPCC23C28/00C25D5/48C23C2/26C25D5/36C23C26/02B21B1/227B21B27/005Y10T29/49986Y10T428/12757Y10T428/12799C25D3/22C09D133/08C09D175/04C09D167/00C23C2/06C23C2/12C09D163/00
Inventor F·A·迈尔斯
Owner AK STEEL PROPERTIES
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