Title:
METHOD FOR PRODUCING STEEL CONDUIT TUBE AND HIGH SI COMPONENT OR HIGH CR COMPONENT STEEL CONDUIT TUBE
Document Type and Number:
WIPO Patent Application WO/2008/108450
Kind Code:
A1
Abstract:
A method for producing a steel conduit tube in which welding defect resulting from
oxides can be reduced stably by plasma irradiation and plasma jet sound can be
reduced. When a steel plate (1) is shaped into a tube and its abutting end faces (4)
are subjected to conduit tube welding, reductive high temperature (false) laminar
flow plasma produced by applying a voltage to reductive mixture gas containing 2-50
vol% of H2 gas and the remainder of Ar gas added or not added with N2
gas and/or He gas is blown at least to the abutting end face (4a) out of a region (6)
where the temperature becomes 650°C or above on the welding upstream side
of a welding point (9). The applying voltage exceeds 120V and the plasma blow
conditions preferably satisfy following expression (1).
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Inventors:
HAMATANI, Hideki (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
濱谷秀樹 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
KODAMA, Shinji (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
児玉真二 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
MIZUHASHI, Nobuo (20-1, Shintomi, Futtsu-sh, Chiba 01, 2930001, JP)
水橋伸雄 (〒01 千葉県富津市新富２０－１日溶工テクノサービス株式会社内 Chiba, 2930001, JP)
TAKEUCHI, Sunao (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
竹内順 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
NAKAJI, Tomohiro (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
濱谷秀樹 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
KODAMA, Shinji (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
児玉真二 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
MIZUHASHI, Nobuo (20-1, Shintomi, Futtsu-sh, Chiba 01, 2930001, JP)
水橋伸雄 (〒01 千葉県富津市新富２０－１日溶工テクノサービス株式会社内 Chiba, 2930001, JP)
TAKEUCHI, Sunao (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
竹内順 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
NAKAJI, Tomohiro (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
Application Number:
JP2008/054100
Publication Date:
September 12, 2008
Filing Date:
February 29, 2008
Export Citation:
Assignee:
NIPPON STEEL CORPORATION (6-3 Otemachi 2-chome, Chiyoda-ku Tokyo, 71, 1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区大手町二丁目６番３号 Tokyo, 1008071, JP)
HAMATANI, Hideki (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
濱谷秀樹 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
KODAMA, Shinji (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
児玉真二 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
MIZUHASHI, Nobuo (20-1, Shintomi, Futtsu-sh, Chiba 01, 2930001, JP)
水橋伸雄 (〒01 千葉県富津市新富２０－１日溶工テクノサービス株式会社内 Chiba, 2930001, JP)
TAKEUCHI, Sunao (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
竹内順 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区大手町二丁目６番３号 Tokyo, 1008071, JP)
HAMATANI, Hideki (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
濱谷秀樹 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
KODAMA, Shinji (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
児玉真二 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
MIZUHASHI, Nobuo (20-1, Shintomi, Futtsu-sh, Chiba 01, 2930001, JP)
水橋伸雄 (〒01 千葉県富津市新富２０－１日溶工テクノサービス株式会社内 Chiba, 2930001, JP)
TAKEUCHI, Sunao (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 1008071, JP)
竹内順 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 1008071, JP)
International Classes:
B21C37/08; B23K13/00; B23K13/06; B21C37/08; B23K13/00
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg.5-1, Toranomon 3-chome,Minato-k, Tokyo 23, 1058423, JP)
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