High Performance Pipeline Steel(continued)

In view of the pipeline constructions for crude,product,coal slurry and high pressure natural gas transmission in coming decades,the developing frontiers of pipeline steel,i.e.,pipeline steel with high deformability for unstable geological region or deep sea environment according strain design principle,the anti-erosion pipeline steel for slurry pipe line,the X100/X120 pipeline steel for long distance natural gas delivery,the new welding material and technique for X100/X120 pipeline steel welding and counter measures to avoid the running ductile fracture occurring are summarized.