Hot-dip galvanized steel sheet having excellent surface appearance and low-temperature bonding brittleness
A hot-dip galvanized steel sheet, surface appearance technology, applied in the direction of hot-dip galvanizing process, heat treatment furnace, heat treatment equipment, etc., can solve the problems of poor low-temperature bonding brittleness, complicated operation, difficult to start zinc, etc., and achieve excellent low-temperature adhesion brittleness, fine surface appearance, quality-enhancing effects
Pending Publication Date: 2021-07-23
浦项股份有限公司
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Problems solved by technology
This method is effective for the miniaturization of spangles, but the operation of the equipment for spraying liquid is complicated, and there is a disadvantage that surface defects may occur when the liquid droplets are sprayed unevenly.
In addition, the disadvantage of the method of reducing spangles of the coating by artificially increasing the solidification rate of the coating is that since the (0001) plane of the zinc is uniformly arranged on the steel plate, the low-temperature adhesion brittleness becomes poor
That is, zinc has a hexagonal close packing (HCP) structure, the slip system is limited, and even twin deformation does not occur when stretching along the C-axis, so the tensile resistance is poor
In addition, depending on the temperature, the activity of the fracture mechanism of zinc metal is different. Above normal temperature, the fracture mechanism is a mixture of brittle, grain boundary and ductile fractures, but at low temperatures, only brittle (cleavage) fractures play a major role, Therefore prone to breakage caused by external shocks
When the zinc is evenly arranged on the (0001) plane and parallel to the substrate, in the low-temperature adhesive brittleness test, the tensile stress acts on the C-axis of the coating, and it is difficult to start the twinning (twin) of zinc, so there is a gap in the coating. The problem of extremely severe brittle fracture occurring at the same time as ductility decreases
Method used
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[0040] Hereinafter, examples of the present invention will be described in detail. The following examples are only used to understand the present invention, and are not intended to limit the scope of the present invention. This is because the scope of rights of the present invention is determined by the content described in the claims and the content reasonably derived therefrom.
[0041] (Example)
[0042] A low-carbon mild steel having a tensile strength of 300 MPa or less was prepared as a base steel plate, and mirror polishing was performed to make the surface free from unevenness for comparison of surface conditions.
[0043] After the polishing, surface irregularities were formed on the surface of the steel sheet so that the surface of the steel sheet had Rsk, Rku, and Ra described in Table 1 below, thereby preparing the steel sheet. The surface modification of the steel sheet is carried out by attaching sand paper between rolls and passing the steel sheet between the ...
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Abstract
The present invention relates to a hot-dip galvanized steel sheet to be used for home appliances, vehicles, and the like, and the objective of the present invention is to provide a hot-dip galvanized steel sheet having excellent surface appearance and low-temperature bonding brittleness.
Description
technical field [0001] The present invention relates to a hot-dip galvanized steel sheet used in home appliances, automobiles, etc., and more specifically, to a hot-dip galvanized steel sheet excellent in surface appearance and low-temperature adhesive brittleness. Background technique [0002] Steel sheets for automobiles etc. should have excellent resistance to external corrosive environments and should have a fine steel surface. In response to this demand, hot-dip galvanized steel sheets have emerged. The hot-dip galvanized steel sheet is a product in which metal zinc is coated on the steel sheet, which is a steel sheet whose corrosion resistance is improved by sacrificial corrosion protection of zinc, and is widely used in home appliances, automobiles, and the like. [0003] Due to the characteristics of home appliances and automotive products, there should be no foreign matter on the surface, the appearance should be exquisite, and there should be no other markings or ...
Claims
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IPC IPC(8): C23C2/02C23C2/06C23C2/40C21D1/74C21D9/46
CPCC21D1/74C23C2/06C21D9/46C23C2/40C23C2/26C23C2/16C23C2/18C23C2/20C21D1/26C23C2/022B32B15/013C21D2241/00B23H1/00B21B27/005B21B27/021B32B3/263B32B3/30B32B7/02B32B15/012C21D7/04B32B3/26C23C30/005B21B1/227B21B1/24B32B15/043C23C30/00B21B1/22B32B15/04B21B27/00B32B15/18B24C1/00B23K26/362B24C1/08Y10T428/12993Y10T428/12951Y10T428/12972Y10T428/12799Y10T428/12472Y10T428/12757B23K26/36B23K26/352Y10T428/12451C23F4/00C23C2/02
Inventor 黄铉锡
Owner 浦项股份有限公司