| 摘要 |
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. |
