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
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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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