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 5 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) 10 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 purities and 15 balance being iron (Fe). The invention also relates to a flexible pipe comprising at least one unbonded armouring layer and at least one unbonded sealing layer wherein at least one armouring layer of the flexible pipe is of this duplex steel.