16. Fluid transport stainless steel seamless pipe (GB/T14976-2002) is used for the transmission fluid made of stainless steel, hot rolled (extrusion, expansion) and cold drawn (rolled) seamless steel tubes.

17. Shaped seamless steel pipe is in addition to other than the cross section of seamless steel tubes in general. By steel cross-section can be divided into different shapes and sizes and so shaped seamless steel pipe wall thickness (code-named D), ranging from shaped seamless steel pipe wall thickness (code-named BD), variable diameter shaped seamless steel pipe (code-named BJ). Shaped seamless steel tubes are widely used in various structural parts, tools and mechanical parts. And the tube compared to shaped tubes are generally larger moment of inertia and section modulus, torsional bending greater ability to significantly reduce the structural weight, saving steel seamless steel pipe prices.