Nkk Corporation

Oki Electric Industry Co., Ltd.

Japan Marine Science and Technology Center

Other

Nobuo Yamagami

Yoshihiko Oda

Katsuhiko Murakami

Hideki Matsuoka

Kunikazu Tomita

Keiichi Kobayashi

Yasuyuki Takada

Iwao Nakano

Toshiyuki Nakanishi

Ichiro Saito

Yasushi Tanaka

Takashi Yoshikawa

Tatsuhiko Hiratani

Hiroaki Kato

Kenji Tahara

Teruo Takeuchi

Akira Hiura

Katsumi Nakajima

Chohachi Sato

Atsushi Chino

Noritaka Takahashi

Shunji Iizuka

Takashi Yokhikawa

A steel sheet for preparing a heat shrink band effective for preventing the color drift is provided by a steel sheet having 24 kg/mm or higher of yield stress and 400 or higher of the product between the permeability &mgr; under a magnetic field of 0.3 Oe and the sheet thickness.

Steel sheet for heat shrink band effective for preventing color drift

A heat shrink band steel sheet of the present invention comprises on the basis of percent in weight C: 0.1% or less, Si: 0.1% or less, Mn: 0.1 to 2%, P: 0.15% or less, S: 0.02% or less, sol Al: 0.08% or less, and N: 0.005% or less, or C: 0.005% or less, Si: 0.1% or less, Mn: 0.1 to 2%, P: 0.15% or less, S: 0.02% or less, sol Al: 0.08% or less, N: 0.005% or less, Ti: 0.02 to 0.06%, and B: 0.0003 to 0.005%, wherein the product of a magnetic permeability at the magnetic field of 0.3 Oe after heat shrinking treatment and a thickness (mm) is at least 350. A color CRT having a sufficient magnetic shielding characteristic and a less amount of color deviation can be realized by the steel sheet.

Heat shrink band steel sheet and manufacturing method thereof

A non-oriented electromagnetic steel sheet contains 0.005 wt. % or less C, 0.2 wt. % or less P, 0.005 wt. % or less N, 4.5 wt. % or less Si, 0.05 to 1.5 wt. % Mn, 1.5 wt. % or less Al and 0.001 wt. % or less S, at least one element selected from the group of 0.001 to 0.05 wt. % Sb, 0.002 to 0.1 wt. % Sn, 0.0005 to 0.01 wt. % Se and 0.0005 to 0.01 wt. % Te; and the balance being Fe and inevitable impurities. The non-oriented electromagnetic steel sheet is produced by the steps of: hot-rolling a slab to form a hot-rolled steel sheet, cold-rolling the hot-rolled steel sheet to form a cold-rolled steel sheet; and finish annealing the cold-rolled steel sheet.

Non-oriented electromagnetic steel sheet and method for manufacturing

A method for manufacturing an alloy rod having giant magnetostriction, which comprises the steps of: supplying a granular or flaky alloy material, which comprises at least two rare earth metals including terbium and dysprosium and at least one transition metal, into a tubular crucible in an inert gas atmosphere kept under a pressure of from 0.2 to 10 atm., arranged in a vertical cylindrical heating furnace; totally melting the alloy material in the crucible in the heating furnace; and then vertically moving any one of the crucible and the heating furnace at a speed of from 0.1 to 5.0 mm/minute in a temperature region of from 1,270.degree. to 1,180.degree. C. of the heating furnace, in which a temperature decreases at a temperature gradient of from 10.degree. to 100.degree. C./cm, to solidify and crystallize the resultant melt of the alloy material in the crucible in a lower portion of the heating furnace, thereby manufacturing an alloy rod having giant magnetostriction, which comprises a single-crystal structure of a unidirectional-solidification structure consistent with the axial line thereof.

Method for manufacturing alloy rod having giant magnetostriction

A method for manufacturing an alloy rod having giant magnetostriction, which comprises the steps of: supplying a rod-shaped alloy material, comprising at least two rare earth metals including terbium and dysprosium and at least one transition metal, into a crucible moving downwardly at a speed of from 0.2 to 8.5 mm/minute in an inert gas atmosphere kept under a pressure of from 0.2 to 10 atm.; heating the rod-shaped alloy material in the circumferential direction thereof in the crucible by means of an annular high-frequency heating coil having a frequency of from 0.1 to 3 MHz and having an inside diameter of from 1.1 to 1.6 times as large as an outside diameter of the crucible, arranged so as to surround the crucible; continuously moving the heating from the lower end toward the upper end of the alloy material to locally and sequentially melt the alloy material in the axial direction thereof; and then locally and sequentially solidifying the resultant molten section of the alloy material in the crucible, thereby manufacturing an alloy rod having giant magnetostriction comprising a single-crystal structure or a unidirectional-solidification structure consistent with the axial line thereof.

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Tokyo, Japan

Nobuo Yamagami