Cold-rolled narrow strip in the form of flat wire or profiled elements made of a high-strength steel for use in flexible pipes, in particular in flexible pipes for offshore applications, and method for producing such cold-rolled narrow strips

摘要

The invention relates to a flat wire or a narrow strip having a profiled cross-section made of a high-strength steel having the following composition (in weight percent): C 0.2 - 0.9%, Mn 12 - 25%, Si up to 0.5%, Al 0.5 - 2.0%, Cr 1.80 - 3.5%, S max. 0.005%, P max. 0.06%, N max. 0.1%, Mo max. 1.5%, B max. 0.01%, Ni max. 2.0%, Cu max. 2.0%, Ca max. 0.015%, Nb 0.02 - 0.35%, and/or V 0.02 - 0.35%, and optionally Ti 0.01 - 0.35%, and, as the remainder, iron and unavoidable, production-related impurities, cold-rolled and/or cold-profiled from wire-shaped starting material having optional intermediate annealing and/or optional final annealing treatment in order to achieve the following mechanical values: R