Exxonmobil Upstream Research Company

Jfe Steel Corporation

Douglas S Hoyt

Narasimha-Rao Venkata Bangaru

Jayoung Koo

Shigeru Endo

Mitsuhiro Okatsu

Hyun-Woo Jin

Douglas Paul Fairchild

Adnan Ozekcin

Raghavan Ayer

Moriyasu Nagae

Shinichi Kakihara

Michael S Weir

Danny Lee Beeson

Wan Cai Kan

James B LeBleu, Jr

Osama Safaqah

Nicholas Andre Dzurec

Narasimha V Bangaru

Danny L Beeson

A steel composition and method from making a dual phase steel therefrom. The dual phase steel may have carbon of about 0.05% by weight to about 0.12 wt %; niobium of about 0.005 wt % to about 0.03 wt %; titanium of about 0.005 wt % to about 0.02 wt %; nitrogen of about 0.001 wt % to about 0.01 wt %; silicon of about 0.01 wt % to about 0.5 wt %; manganese of about 0.5 wt % to about 2.0 wt %; and a total of molybdenum, chromium, vanadium and copper less than about 0.15 wt %. The steel may have a first phase consisting of ferrite and a second phase having one or more of carbide, pearlite, martensite, lower bainite, granular bainite, upper bainite, and degenerate upper bainite. A solute carbon content in the first phase may be about 0.01 wt % or less.

Low yield ratio dual phase steel linepipe with superior strain aging resistance

A tubular assembly comprising a first iron based tubular having a first non-cladded inner surface; and a second iron based tubular having a second non-cladded inner surface, wherein the first tubular is connected to the second tubular using a non-iron based bonding material. Preferably, the non-iron based bonding material has a lower crack growth rate than the iron based tubulars.

Apparatus and methods of improving riser weld fatigue

Growing community of inventors

The Woodlands, TX, United States of America

Douglas S Hoyt