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High strength steel plate having superior electric and magnetic shielding property and method for producing same

一种高强度钢板、电磁屏蔽的技术，应用在磁场/电场屏蔽、磁性材料、磁性物体等方向，能够解决镀层等问题

Inactive Publication Date: 2003-03-05
POHANG IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the steel plate is hot dipped, the presence of Si is easy to cause coating defects, such as defects that are not coated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Steel compositions were prepared with different Cu, Sn contents, etc. shown in Table 1 below, and 30 kg of each steel composition was subjected to vacuum melting. In Table 1, the symbol "Tr" indicates that the element was not added. In each composition, the C and N contents were 0.0030% or less, while the S content was controlled at 0.0090%.

[0078] The molten composition was reheated at 1250°C and hot-rolled at the final deformation temperature maintained at 900°C to obtain hot-rolled steel sheets each with a thickness of 2mm, and the hot-rolled scale on the steel sheets was removed by pickling. The pickled hot-rolled steel sheet was cold-rolled to a thickness of 1 mm at a reduction percentage of 50%. Then annealing was carried out at 850° C. with a continuous annealing simulator to obtain cold-rolled steel sheets. Galvanize each cold-rolled steel sheet with a hot-dip galvanizing simulator with a coating density of 300g / m 2 .

[0079] The electromagnetic shielding...

Embodiment 2

[0087] 30 kg of a composition containing the following elements: 0.003% or less C, 0.003% or less N, 0.2% Mn, 0.2% Al, 0.2% Si, 0.2% Cu and 0.2% Sn. The melted slabs were made into 2 mm thick hot-rolled steel sheets under various temperature conditions including reheating temperature, final deformation temperature and coiling temperature. The hot-rolled iron scale on the steel plate is removed by pickling. The pickled hot-rolled steel sheet was cold-rolled to a thickness of 1 mm at a reduction percentage of 50%. Then annealing was carried out at 850° C. with a continuous annealing simulator to obtain cold-rolled steel sheets.

[0088] The electromagnetic shielding effect at 60 Hz of each cold-rolled steel sheet was measured by an electromagnetic shielding effect analyzer, and the results are shown in Table 2 below. In addition, the mechanical properties of the steel sheets such as yield strength were measured with a general testing machine, and the results are summarized in...

Embodiment 3

[0098] Vacuum melting 30 kg of a composition containing the following elements: 0.003% or less C, 0.003% or less N, 0.008% S, 0.2% Mn, 0.2% Al, 0.2% Si, 0.2% Cu and 0.2% Sn.

[0099] After reheating the smelted composition at 1200°C, it was made into hot-rolled steel sheets with thicknesses of 1.8, 2.0, 3.0, and 4.0 mm, while FDT and CT were set at 910°C and 680°C, respectively. The steel sheets were then cold rolled to a thickness of 1 mm at various reduction percentages shown in Table 3. Annealed at 850°C, these panels were then hot dipped with zinc to a coating density of 180g / m 2 . Some of the resulting hot-dip-coated steel sheets were skin-pass rolled at various reduction percentages.

[0100] The electromagnetic shielding effect at 60 Hz of each cold-rolled steel sheet was measured with an electromagnetic shielding effect analyzer, and the results are shown in Table 3 below. In addition, the mechanical properties (yield strength) of the steel sheets were measured wit...

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Abstract

A steel plate and a hot-dip galvanized steel plate, superior in terms of high electromagnetic shield capacity. The steel plate is prepared from a composition comprising C, N and S in an amount of 0.150% by weight or less in total; Mn in an amount of 0.1 to 1.0% by weight; Si in an amount of 0.5% by weight or less; Al in an amount of 1.0% by weight or less; P in an amount of 0.06% by weight or less; and Fe for the remainder, and inevitable elements, and shows a yield strength of 18 kg / mm2 or higher, and an elongation of 40% or higher. The hot-dip galvanized steel plate is prepared from a composition comprising C, N and S in an amount of 0.0150 % by weight or less in total; Mn in an amount of 0.2 to 0.8% by weight; Al in an amount of 0.6% by weight or less; Si in an amount of 0.4% by weight or less; P in an amount of 0.06% by weight or less, with the proviso that the sum of Mn, Al, Si and P amounts to 0.2-1.0% by weight; and Fe for the remainder, and inevitably present elements. In addition to having high yield strength, the hot-dip galvanized steel plate is resistant to corrosion owing to the coating of a corrosion-resistant element on the surface.

Description

technical field [0001] The invention relates to a high-strength steel plate with excellent electromagnetic shielding performance and hot-dipping performance, which is suitable for fields requiring high corrosion resistance, such as the field of building decoration. More specifically, the present invention relates to a high-strength steel sheet having excellent electromagnetic shielding performance and hot-dip plating performance, the steel sheet has a shielding effect of 25 dB (shielding efficiency of 93%) or more for an electromagnetic field of 60 Hz and a yield strength of 22kg / mm 2 or higher. Background technique [0002] Electromagnetic energy in the form of electromagnetic waves is produced by many natural and man-made sources. These waves contain oscillating electromagnetic fields that have different effects on biological systems such as cells, plants, animals or humans. The discovery that electromagnetic waves are harmful to the human body has led people to develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/08A01N59/06A01N59/16B05D7/14C09K3/00C21D8/02C21D8/12C21D9/46C22C38/00C22C38/02C22C38/06C22C38/16C23C2/02C23C2/06C23C2/26C23C28/00C23C30/00H01F1/00H05K9/00
CPCB05D7/14C21D8/0278C22C38/02C23C28/00C23C2/02C21D8/1222Y10S428/935C21D8/0236C23C2/06C22C38/04C21D8/0226B05D2601/20A01N59/06C21D8/1233C23C2/26Y10S428/939C22C38/06C22C38/008A01N59/16C22C38/16C21D8/1277Y10T428/25Y10T428/258Y10T428/12972Y10T428/12569Y10T428/12611Y10T428/12556Y10T428/1259Y10T428/12799Y10T428/252Y10T428/26Y10T428/12965Y10T428/12979Y10T428/12986Y10T428/31678C23C2/024C23C2/0224
Inventor 金逸荣李在永孙晋君赵雷夏郭荣镇权纯宙金容敏李贞植
Owner POHANG IRON & STEEL CO LTD
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