... technique about welded stainless steel tubes and pipes production.We also accept OEM orders and production.1) Material of stainless steel ... ASTM A270, ASTM A312,DIN 118504) Mark: Steel Seal and Label5) Applied field: Decoration, Heat-Exchanger, Condenser Tubes, ... Sanitation, food industry , Petroleum and Gas Industry and Liquird Delivery.6) Surface: 180#, 400#, 600# , ...