Application of steel pipes as part of ocean engineeringThe application of steel pipes in ocean engineering is very common. There are approximately three forms of steel pipes in 2 biggest techniques out of shipbuilding as well as ocean engineering main-stream metal pipelines, structural steel pipelines plus special-purpose metal pipes.V, Nb, Ti, Al fine grain such as trace elements, inside sort of metal as well as the the best and B level metal, C, D, age as part of metal must contain a minumum of one of those. To be able to improve the efficiency of this steel, grade one and B in metal can also join one. In addition, this kind of steel concerning Cr, Ni, Cu information out of residual elements each never more than 30. Q345A, B, C, D, Age is agent of this sort of metal grades, such as 16 mn steel is normally known as The and B level Above grade C steel must put one or more trace elements,