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Title:
STEEL PIPE WITH CONCAVITIES, AND COMPOSITE PILE
Document Type and Number:
WIPO Patent Application WO/2012/115138
Kind Code:
A1
Abstract:
The present invention provides a steel pipe with concavities, wherein a plurality of concavity parts is formed on the outer circumference face of a steel pipe, such that a line is formed in the steel pipe axis direction. Within each of the concavity parts, a columnar depression part is formed which makes a depression deeper even than the bottom faces of the concavity parts and which follows the steel pipe axis direction. The ratio of the average Vickers hardness (HA) in each of the concavity parts and the Vickers hardness (HB) in the portions between concavity parts which are adjacent to one another in the steel pipe axis direction satisfies the formula 0.95 ≤ HA/HB ≤ 1.05. Hot scale skin is provided on the outer circumference face.

Inventors:
TAKAGI Masahide (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
高木 優任 (〒71 東京都千代田区丸の内二丁目6番1号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
TAENAKA Shinji (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
妙中 真治 (〒71 東京都千代田区丸の内二丁目6番1号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
SATOH Tetsu (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2012/054246
Publication Date:
August 30, 2012
Filing Date:
February 22, 2012
Export Citation:
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Assignee:
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目6番1号 Tokyo, 〒1008071, JP)
TAKAGI Masahide (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
高木 優任 (〒71 東京都千代田区丸の内二丁目6番1号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
TAENAKA Shinji (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
妙中 真治 (〒71 東京都千代田区丸の内二丁目6番1号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
International Classes:
E02D5/28; B21D17/04; E02D5/30
Foreign References:
JPS61162657A
JPH07127053A
Attorney, Agent or Firm:
SHIGA Masatake et al. (1-9-2, Marunouchi Chiyoda-k, Tokyo 20, 〒1006620, JP)
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Claims: