The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2003
Filed:
Mar. 13, 2002
Gustavo Javier López Turconi, Campana, AR;
Teresa Estela Pérez, Capital Federal, AR;
Juan Carlos González, Pcia de BsAs, AR;
Siderca S.A.I.C., Buenos Aires, AR;
Abstract
Low-alloy carbon steel for the manufacture of seamless pipes having improved resistance to corrosion, particularly the “sweet corrosion” that occurs in the media rich in CO , for using in exploration and production of oil and/or natural gas. The steel contains: 1.5-4.0% by weight of Cr, 0.06-0.10% by weight of C, 0.3-0.8% by weight of Mn, not more than 0.005% by weight of S, not more than 0.015% by weight of P, 0.20-0.35% by weight of Si, 0.25-0.35% by weight of Mo, 0.06-0.9% by weight of V, approximately 0.22% by weight of Cu, approximately 0.001% by weight of Nb, approximately 0.028% by weight of Ti, not more than a total value of O of 25 ppm, with the balance being Fe and unavoidable impurities. The process to manufacture seamless pipes comprises the stages of elaboration of a primary melt, followed by a secondary metallurgy stage with a strong desulfurization, addition of ferroalloys and chromium, and then the modification and flotation of the inclusions until the specified formulation is achieved; followed by casting, continuous hot-rolling, and optionally by normalizing, austenizing, quenching and tempering,