USE OF A STEEL COMPOSITION FOR THE PRODUCTION OF AN ARMOURING LAYER OF A FLEXIBLE PIPE AND THE FLEXIBLE PIPE

摘要

The invention relates to a use of a duplex steel for the production of an armouring layer of a flexible pipe comprising at least one unbonded armouring layer and at least one unbonded sealing layer wherein the duplex steel comprises in weight percent 0.01-0.05% by weight of carbon (C) at least 0.15% by weight of nitrogen (N) 20.0-23.0% by weight of chromium (Cr) up to 3.0% by weight of nickel (Ni) up to 1.0% by weight of molybdenum (Mo) 3-6% by weight of manganese (Mn) up to 1.0% by weight of copper (Cu) incidental impurities and balance being iron (Fe).