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Title:
METHOD FOR REUSE OF STEEL SHEET SCRAP
Document Type and Number:
WIPO Patent Application WO/2003/050316
Kind Code:
A1
Abstract:
A method for reusing a steel sheet, which comprises recovering scraps of high tensile steel and ordinary steel without separation, melting the recovered scraps to produce a melt, and carrying out an adjustment of chemical composition of the melt wherein a sulfur content is controlled to 0.02 to 0.2 wt % when the melt contains 0.7 wt % of manganese, and a rare earth element or mish metal is added in an amount twice that of sulfur. When s spherical graphite cast iron is desired, a spheroidizing agent (preferably, an agent containing bismuth and no rare earth element) is added. The method allows the production of a cast iron having good quality even by the use of a steel sheet scrap containing a high tensile steel scrap with good efficiency at a relatively low cost.

Inventors:
Horie, Hiroshi (10-67, Kitayugaose-cho Morioka-shi, Iwate, 020-0031, JP)
Kowata, Toshinori (260-28, Takizawa aza anaguchi Iwate-gu, Takizawa-mura Iwate, 020-0173, JP)
Aida, Taira c/o DAIHATSU MOTOR CO. LTD. (1-1, Momozono 2-chom, Ikeda-shi Osaka, 563-8651, JP)
Miyawaki, Shigeji c/o OSAKA SPECIAL ALLOY CO. LTD. (2-62, Nakashima 2-chome, Nishiyodogawa-k, Osaka-shi Osaka, 555-0041, JP)
Miyake, Makoto c/o Katsuyama, Plant Of (OSAKA SPECIAL ALLOY CO. LTD., 34-2 Chiyoda, Osowa-ch, Katsuyama-shi Fukui, 911-0831, JP)
Application Number:
PCT/JP2002/012814
Publication Date:
June 19, 2003
Filing Date:
December 06, 2002
Export Citation:
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Assignee:
DAIHATSU MOTOR CO., LTD. (1-1 Daihatsu-cho, Ikeda-shi, Osaka, 563-0044, JP)
OSAKA SPECIAL ALLOY CO., LTD. (2-62, Nakashima 2-chome Nishiyodogawa-k, Osaka-shi Osaka, 555-0041, JP)
Horie, Hiroshi (10-67, Kitayugaose-cho Morioka-shi, Iwate, 020-0031, JP)
Kowata, Toshinori (260-28, Takizawa aza anaguchi Iwate-gu, Takizawa-mura Iwate, 020-0173, JP)
Aida, Taira c/o DAIHATSU MOTOR CO. LTD. (1-1, Momozono 2-chom, Ikeda-shi Osaka, 563-8651, JP)
Miyawaki, Shigeji c/o OSAKA SPECIAL ALLOY CO. LTD. (2-62, Nakashima 2-chome, Nishiyodogawa-k, Osaka-shi Osaka, 555-0041, JP)
Miyake, Makoto c/o Katsuyama, Plant Of (OSAKA SPECIAL ALLOY CO. LTD., 34-2 Chiyoda, Osowa-ch, Katsuyama-shi Fukui, 911-0831, JP)
International Classes:
C21C1/08; C21C1/10; C21C5/56; C22C33/08; C22C37/04; C22C37/10; C22C38/00; C22C38/02; C22C38/60; (IPC1-7): C22C33/08; C21C1/08; C21C1/10; C22C33/10
Attorney, Agent or Firm:
Okamoto, Hiroyuki (Kawaramachi NK Building, 8-5 Kawaramachi 4-chome, Chuo-k, Osaka-shi Osaka, 541-0048, JP)
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