Title of Invention

A STEEL PLATE

Abstract An ultra-high strength, weldable, low alloy steel with excellent cryogenic temperature toughness in the base plate and in the heat affected zone (HAZ) when welded, having a tensile strength greater than about 830 MPa (120 ksi) and a microstructure comprising (i) predominantly fine-grained lower bainite, fine-grained lath martensite, fine granular bainite (FGB), or mixtures thereof, and (ii) up to about 10 vol % retained austenite, is prepared by heating a steel slab comprising iron and specified weight percentages of some or all of the additives carbon, manganese, nickel, nitrogen, copper, chromium, molybdenum, silicon, niobium, vanadium, titanium, aluminum, and boron; reducing the slab to form plate in one or more passes in a temperature range in which austenite recrystallizes; finish rolling the plate in one or more passes in a temperature range below the austenite recrystallization temperature and above the Ar¿3? transformation temperature; quenching the finish rolled plate to a suitable Quench Stop Temperature (QST); stopping the quenching; and either, for a period of time, holding the plate substantially isothermally at the QST or slow-cooling the plate before air cooling, or simply air cooling the plate to ambient temperature.
Full Text

Documents:

343-MUMNP-2005-ABSTRACT(9-4-2010).pdf

343-MUMNP-2005-ABSTRACT(GRANTED)-(30-6-2011).pdf

343-MUMNP-2005-CANCELLED PAGES(9-4-2010).pdf

343-mumnp-2005-claims(28-4-2005).pdf

343-MUMNP-2005-CLAIMS(AMENDED)-(9-4-2010).pdf

343-MUMNP-2005-CLAIMS(GRANTED)-(30-6-2011).pdf

343-MUMNP-2005-CORRESPONDENCE(23-6-2006).pdf

343-MUMNP-2005-CORRESPONDENCE(25-5-2009).pdf

343-MUMNP-2005-CORRESPONDENCE(4-5-2010).pdf

343-mumnp-2005-correspondence(9-4-2010).pdf

343-MUMNP-2005-CORRESPONDENCE(IPO)-(1-7-2011).pdf

343-mumnp-2005-correspondence(ipo)-(4-5-2009).pdf

343-mumnp-2005-description(complete)-(28-4-2005).pdf

343-MUMNP-2005-DESCRIPTION(GRANTED)-(30-6-2011).pdf

343-mumnp-2005-drawing(28-4-2005).pdf

343-MUMNP-2005-DRAWING(9-4-2010).pdf

343-MUMNP-2005-DRAWING(GRANTED)-(30-6-2011).pdf

343-MUMNP-2005-FORM 1(23-6-2006).pdf

343-mumnp-2005-form 1(28-4-2005).pdf

343-MUMNP-2005-FORM 1(9-4-2010).pdf

343-mumnp-2005-form 13(25-5-2009).pdf

343-mumnp-2005-form 18(19-10-2005).pdf

343-mumnp-2005-form 2(28-4-2005).pdf

343-MUMNP-2005-FORM 2(GRANTED)-(30-6-2011).pdf

343-mumnp-2005-form 2(title page)-(28-4-2005).pdf

343-MUMNP-2005-FORM 2(TITLE PAGE)-(GRANTED)-(30-6-2011).pdf

343-mumnp-2005-form 3(23-6-2006).pdf

343-mumnp-2005-form 3(28-4-2005).pdf

343-MUMNP-2005-FORM 3(9-4-2010).pdf

343-mumnp-2005-form 5(28-4-2005).pdf

343-MUMNP-2005-PETITION UNDER RULE 137(9-4-2010).pdf

343-MUMNP-2005-PETITION UNDER RULE 138(9-4-2010).pdf

343-MUMNP-2005-POWER OF ATTORNEY(22-3-2006).pdf

343-MUMNP-2005-POWER OF ATTORNEY(9-4-2010).pdf

343-MUMNP-2005-REPLY TO EXAMINATION REPORT(9-4-2010).pdf

343-MUMNP-2005-SPECIFICATION(AMENDED)-(9-4-2010).pdf

343-MUMNP-2005-WO INTERNATIONAL PUBLICATION REPORT(28-4-2005).pdf


Patent Number 248273
Indian Patent Application Number 343/MUMNP/2005
PG Journal Number 27/2011
Publication Date 08-Jul-2011
Grant Date 30-Jun-2011
Date of Filing 28-Apr-2005
Name of Patentee EXXONMOBIL UPSTREAM RESEARCH COMPANY
Applicant Address 3120 Buffalo Speedway, P.O.Box 2189,Houston, Texan 77252-2189,
Inventors:
# Inventor's Name Inventor's Address
1 JAYOUNG KOO Of 828 Star View Way, Bridgewater,NJ 00807,
2 NARASHIMHA-RAO BANGARU Of 5 Revere Court, Annandale,NJ 08801,
3 GLEN A VAUGHN Of 4211 Rice Boulevard, Houston,Texas 77005,
4 RAGHAVAN AYER Of 3 North Slope, Clinton,NJ 08809
PCT International Classification Number C21D1/19,C21D8/02
PCT International Application Number PCT/US99/30055
PCT International Filing date 1999-12-16
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 09/215,773 1998-12-19 U.S.A.