FE-NI ALLOY SHEET AND FE-NI-CO ALLOY SHEET FOR COLOR PICTURE TUBE, EXCELLENT IN MAGNETIC PROPERTY, AND THEIR PRODUCTION

Japanese Patent JP3284732

B2

PURPOSE: To obtain an Fe-Ni alloy sheet for color picture tube, excellent in magnetic properties, by limiting the impurities in an Fe-Ni alloy containing specific amounts of Ni, Mn, and Si and specifying crystal plane integration degree after blackening treatment and hardness, respectively.
CONSTITUTION: In an Fe-Ni or Fe-Ni-Co alloy containing, by weight, 30-45% Ni or 27-33% Ni and 3-8% Co, 0.001-0.70% Mn, and 0.001-0.30% Si, the amounts of Ti, Mo, W, Nb, V, Cu, Sn, and Al as impurities are limited so that they satisfy ≤0.10% Ti, ≤0.10% Mo, ≤0.10% W, ≤0.10% Nb, ≤0.10% V, ≤0.30% Cu, ≤0.10% Sn, and ≤0.07% Al and also Ti+Al+Si+Mo+W+Nb+V+Cu+ Sn≤0.70% is satisfied. Further, the integration degrees of [331], [210], and [211] crystal planes to the surface of the alloy sheet after blackening treatment satisfy the table and also Vickers hardness Hv is regulated to ≤150. In order to satisfy the above conditions, hot rolled plate annealing temp., annealing temp. before press forming, and blackening treatment temp. are regulated to 810-990°C, 720-900°C, and 520-600°C, respectively.

Tadashi Inoue
Kiyoshi Tsuru
Katsuhisa Yamauchi
Hiroshi Wakasa

JP3167594A

May 20, 2002

March 01, 1994

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Nippon Steel Tube Co., Ltd.

C21D8/02; C22C38/00; C22C38/16; H01J29/07; (IPC1-7): C22C38/00; C21D8/02; C22C38/16; H01J29/07

JP762496A
JP734201A
JP657384A
JP657383A
JP641688A
JP5209254A
JP5195160A
JP586441A

Shigeru Takano

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