Application Prospect of Nitrogen-containing Austenitic Stainless Steel in Welded Pipe Manufacturing Industry

It is very difficult for the conventional welded pipes made of 304 and 316 austenitic stainless steels to have their weld seams with complete austenitic structure. The nitrogen-contained Cr-Ni austenitic stainless steel-made welded pipe is regarded as a newly-developed stainless steel weld tubular product to have a wide application prospect due to its high strength and corrosion resistance,and high austenitic stability which leads to satisfactory plasticity,toughness and workability. Detailed in the paper are the R & D of the said nitrogen-containing stainless steel,covering the effect of nitrogen,and the welding characteristics and application of the steel to the field of welded pipe manufacturing. In addition,relevant suggestions concerning domestic stainless steel and welded pipe productions are put forward.