MAGNETIC SHIELD MATERIAL, STEEL SHEET FOR MAGNETIC SHIELD MATERIAL AND ITS PRODUCTION METHOD

Japanese Patent JP3775215

B2

PROBLEM TO BE SOLVED: To develop a technique for economically producing a magnetic shield material of high quality in which the content of P is suppressed as much as possible, and magnetic permeability and coercive force are secured.
SOLUTION: The steel sheet has a chemical composition containing, by mass, ≤0.005% C, ≤0.03% Si, 0.10 to 0.50% Mn, ≤0.020% P, ≤0.010% S, ≤0.002% sol.Al, ≤0.0030% N and ≤0.030% O, and in which the contents of C, Mn, S, sol.Al and N also satisfy the following formula (1) and inequality (2): NSR= N-14/27×sol.Al...(1), and 5.0≤-(Mn-55/32×S)/(55/12×C+55/14×NSR)≤50...(2). A continuously cast slab is heated to a heating temperature T(°C) satisfying the following inequality (3), is hot-rolled under the conditions where finishing temperature is ≥750°C, and coiling temperature is ≥550°C, is pickled, and is thereafter cold-rolled at a draft of 60 to 90% into a cold rolled steel sheet having a sheet thickness of 0.3 to 0.6 mm, and next, annealing is performed thereto, so that the crystal grain size measured in accordance with JIS G0552 is allowed to satisfy 5.0 to 8.5: T(°C)-≤(9020)/(2.929-log[Mn.S])-200...(3).

Kiyoshi Fukui
Kei Tsutsumi
Shinichiro Kira
Tsuyoshi Yoshida
Toshio Fujiki
Keiichi Yamanaka
Sakamoto Nao

JP2000373254A

May 17, 2006

December 07, 2000

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Sumitomo Metal Building Materials Co., Ltd.

C21D8/12; C22C38/00; C22C38/06; C22C38/60; H01F1/16; (IPC1-7): C22C38/00; C21D8/12; C22C38/06; C22C38/60; H01F1/16

JP8060246A
JP9041086A

Shoichi Hirose

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