With the continuing improvement in quality of hot rolled coils and the progress in pipe-processing equipment and technology, the quality of spirally welded pipes was enhanced rapidaly. SSAW steel pipes performed well in the trunk pipelines in China and Canada without serious quality and safety problems, and so their high ratio of performance against cost has been increasingly recognized by customers. In recent years, more than 70% of natural gas long distance pipelines are applied by SSAW steel pipes. The technology of low stress forming, residual stress control, pipe end expanding and nondestructive testing, as well as the adoption of high toughness welding wire and welding flux have significantely improved the quality of domestically produced sprially welded steel pipes.