Abstract：This paper has designed the composition of X60 pipeline steel based on the systematically research of Niobium micro alloy. The 87mm×1538mm thin slab has been obtained by controlling the parameters of FTSR process. In the rolling process, Controlled rolling and controlled cooling technology has been used to get the coil which thickness is 7.9mm.The microstructure of produce pipeline has no duplex grain structure by detection, and the mechanical property are all satisfied with the necessary. By checking out the fracture surface, the ductility dimple has been found and there is no laminate, the production has met the API-5L standard and engineering application.
2009, Vol. 1 
