... :Eddy current & Hydrostatic test, etc. Stainless steel welded tube/pipe. Stainless steel welded tube / pipe:1. Standard: GB, ASTM, JIS, DIN, EN ... according to customer request.6. Application: heater, boiler, heat exchanger, condenser,etc7. Technics: bead removed, bright annealed, pickling, electropolishing, mechanical polishing ... are sincerely looking forword to cooperate with you. 304 round tube