HIGH-STRENGTH WELDED STEEL PIPE AND METHOD FOR PRODUCING THE SAME

Title:

HIGH-STRENGTH WELDED STEEL PIPE AND METHOD FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2011/096510

Kind Code:

A1

Abstract:

Provided is a high-strength welded steel pipe obtained by butt welding a steel sheet formed into the shape of a pipe. The base metal portion of the steel sheet comprises, by mass%, C: 0.010% - 0.080%, Si: 0.01% - 0.50%, Mn: 0.50% - 2.00%, S: 0.0001% - 0.0050%, Ti: 0.003% - 0.030%, Mo: 0.05% - 1.00%, B: 0.0003% - 0.0100%, O: 0.0001% - 0.0080%, and N: 0.006% - 0.0118% with the remainder being iron and inevitable impurities, P being limited to 0.050% or less, and Al being limited to 0.008% or less. Ceq is 0.30 to 0.53, Pcm is 0.10 to 0.20, [N]-[Ti]/3.4 is less than 0.003, the average crystal grain size of the austenite particles of the welding heat-affected section of the steel sheet is 250 µm or less, and the austenite particles include bainite and intragranular bainite.

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Inventors:

FUJISHIRO Taishi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
藤城　泰志 (〒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)
HARA Takuya (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
原　卓也 (〒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)
TERADA Yoshio (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)

Application Number:

JP2011/052348

Publication Date:

August 11, 2011

Filing Date:

February 04, 2011

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)
FUJISHIRO Taishi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
藤城　泰志 (〒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)
HARA Takuya (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
原　卓也 (〒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:

C22C38/00; B21C37/08; B23K9/025; B23K9/18; B23K9/23; B23K31/00; C21D8/10; C21D9/08; C21D9/50; C22C38/14; C22C38/58; B23K35/30

Attorney, Agent or Firm:

SHIGA Masatake et al. (1-9-2, Marunouchi Chiyoda-k, Tokyo 20, 〒1006620, JP)

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Claims:

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