ELECTRIC-RESISTANCE-WELDED STEEL PIPE

Title:

ELECTRIC-RESISTANCE-WELDED STEEL PIPE

Document Type and Number:

WIPO Patent Application WO/2014/119802

Kind Code:

A1

Abstract:

Provided is an electric-resistance-welded steel pipe having excellent fatigue strength. The electric-resistance-welded steel pipe has a composition which contains, in terms of mass%, 0.35-0.55% C, 0.01-1.0% Si, 1.0-3.0% Mn, up to 0.02% P, up to 0.01% S, up to 0.005% Al, up to 0.0050% N, and 0.1-0.5% Cr, with the remainder comprising Fe and unavoidable impurities, and has a metallographic structure which comprises pearlite, ferrite, and bainite, the areal proportion of the pearlite being 85% or more and the sum of the areal proportion of the ferrite and the areal proportion (including zero) of the bainite being 15% or less, and in which the prior-austenite grain diameter is 25 μm or larger.

Inventors:

ARATANI MASATOSHI (JP)
OKABE TAKATOSHI (JP)
TOYODA SHUNSUKE (JP)
KAWABATA YOSHIKAZU (JP)
HORI HIROMICHI (JP)

Application Number:

PCT/JP2014/052708

Publication Date:

August 07, 2014

Filing Date:

January 30, 2014

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C22C38/38; C22C38/58; C21D8/10

Domestic Patent References:

WO2006104023A1

2006-10-05

Foreign References:

JP2007119865A	2007-05-17
JP2004190086A	2004-07-08
JP2002356742A	2002-12-13

Other References: