JIS G3461 Carbon Steel Tubes is used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superheater tubes and air preheater tubes of the boiler, and heat exchanger tubes,condenser tubes and catalyser tubes used in chemical and petroleum industries. It is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service. Grade:G3461 STB340 (STB35), G3461 STB410(STB42), G3461 STB510 (STB52) Outer Dimensions: 19.05mm – 168.3mm Wall Thickness:2.0mm – 14 mm Length: max 19000mm