... in 1994, is a leading manufacturer and exporter of stainless steel welding pipe/tube, outer diameter less than 219mm. ... We professionally produce welded stainless steel pipes, and we have 8 advanced production lines to ... exchangers, condensers, pipe fittings, electric power ,paper making, medicine, etc.3) Stainless steel materials: TP304, TP304L, TP316L, TP321, TP310S;4) ...