Ultra-thin cold-rolled steel sheet excellent in press workability, galvanized steel sheet, and manufacturing method thereof
A technology of cold-rolled steel sheet and stamping processing, which is applied in the field of cold-rolled steel sheet, can solve the problems such as the decline of material price competitiveness, and achieve the effect of suppressing the occurrence of defects and excellent processability
Active Publication Date: 2018-03-27
浦项股份有限公司
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Problems solved by technology
[0004] As one of the proposals for satisfying such demands, it has been proposed to ensure both strength and formability by solid solution strengthening and precipitation strengthening of Mn, Si, P, Ti, etc. in ultra-low carbon materials with a carbon content of 40 ppm or less method, however, further leads to the problem that the price competitiveness of the material is lowered, and various defects are also produced in the production of the product
Method used
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Embodiment Construction
[0079] Hereinafter, the present invention will be explained more specifically through examples. However, the following examples are merely exemplified for describing the present invention in more detail, and are not intended to limit the scope of rights of the present invention. The scope of rights of the present invention is determined by the content described in the claims and the content reasonably inferred therefrom.
[0080] (Example)
[0081] Using the conditions shown in Table 2 below, the steel ingots having the composition shown in Table 1 below were reheated-hot rolled-coiled-cold rolled-continuous annealing-tempered rolling to produce the final Steel. In particular, the winding temperature that affects surface defects has been set in various ways.
[0082] After that, the area content, particle size and crystal grain size of the precipitates of the steel produced above were measured, and the other physical properties (yield strength, elongation) were measured, and are s...
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Abstract
The present invention relates to a cold-rolled steel sheet used for components and frames of electronic products, and more particularly, to a cold-rolled steel sheet excellent in press formability, a galvanized steel sheet using the same, and a method for producing the same. For this reason, the present invention secures expected strength and ductility by optimizing the alloy composition and manufacturing conditions, thereby providing a steel material with no surface defects and excellent formability.
Description
Technical field [0001] The present invention relates to a cold-rolled steel sheet used in parts and frames of electronic products. More specifically, it relates to a cold-rolled steel sheet having excellent press formability, a galvanized steel sheet using the same, and a manufacturing method thereof. Background technique [0002] Materials used for parts of home appliances, especially for panels, etc. As low-carbon series steel materials with a carbon content of 200 to 400 ppm, they are generally stamped into embossed parts and curved parts. Steps, and the material molded in this way can play a role in supporting the product, so it needs strength above a certain level and needs to have high moldability for integrated molding. [0003] However, in recent years, after the thinning of materials used for parts of home appliances and the introduction of more complex molding methods than the prior art, it has been proposed that cracks occur when molding existing low-carbon steel materia...
Claims
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IPC IPC(8): C22C38/00C21D8/02C21D9/46B21B3/00
CPCB21B3/00C21D8/02C21D9/46C22C38/00C21D8/0436C21D8/0473C21D2211/004C21D2211/005C21D8/0226C21D8/0236C21D8/0273C22C38/001C22C38/04C22C38/06
Inventor 李炳镐全在春
Owner 浦项股份有限公司