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1. (WO2018042522) OIL WELL PIPE FOR EXPANDABLE TUBULAR

Pub. No.:    WO/2018/042522    International Application No.:    PCT/JP2016/075364
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Wed Aug 31 01:59:59 CEST 2016
IPC: C22C 38/00
C22C 38/14
C22C 38/58
C21D 9/08
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: NAGAI, Kensuke
長井 健介
WADA, Manabu
和田 学
HASEGAWA, Noboru
長谷川 昇
IMAMURA, Hirohito
今村 洋仁
OZAKI, Masakazu
尾▲崎▼ 雅和
Title: OIL WELL PIPE FOR EXPANDABLE TUBULAR
Abstract:
This oil well pipe for expandable tubular comprises, in mass%, 0.020-0.080% of C, 0.50% or less of Si,0.30-1.60% of Mn, 0.030% or less of P, 0.010% or less of S, 0.005-0.050% of Ti, and 0.010-0.500% of Al, the remaining portion being Fe and impurities, wherein, in the metal structure, the area fraction of a first phase including ferrite is 90.0-98.0%, and the area fraction of a second phase including one or more selected from the group consisting of annealed martensite, annealed bainite, and pearlite is 2.0-10.0%.