Welded pipes for electric heating: outer diameter 6mm-23mm, materials include 201cu, 304, 321, 316L, 309S, 310 Sincoloy 840, 800, 825. This is also our company's best-selling and most competitive product, with reliable welds, superior extension performance, high consistency, and quality trusted by customers around the world The products are sold to electric heater manufacturers in Southeast Asia, South Africa, Europe, the United States, the Middle East, and other regions.