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:
Apr. 11, 2017
Filed:
Aug. 21, 2015
Arcelormittal Wire France, Bourg en Bresse, FR;
ArcelorMittal Wire France, Bourg en Bresse, FR;
Abstract
A process for the manufacture of a profiled wire of hydrogen-embrittlement-resistant, low-alloy carbon steel for flexible pipelines for the offshore oil and gas operations sector is provided. The process includes providing a low-alloy carbon steel wire rod having a composition including, expressed in percentages by weight of the total mass 0.75<C %<0.95; 0.30<Mn %<0.85; Cr≦0.4%; V≦0.16%; and Si≦1.40%, the rest being iron and the inevitable impurities from smelting of the metal in the liquid state. The process further includes hot-rolling the wire rod in an austenitic region above 900° C., cooling the wire rod to ambient temperature, subjecting the wire rod to isothermal quenching to obtain a homogeneous pearlitic microstructure, subjecting the wire rod to an operation of cold mechanical transformation, carried out with a global work-hardening ratio of from approximately 50 to 80%, to give the wire rod a diameter of from approximately 5 to 30 mm and subjecting the drawn wire to a short-duration recovery heat treatment carried out below an Ac1 temperature of the steel.