Shanghai Labor Steel Pipe Factory is a professional factory that produces hot-dip galvanized steel pipes, welded steel pipes, and steel-plastic composite pipes. The factory has a history of fifty years and is one of the earliest enterprises in China to produce straight seam welded steel pipes. In the 1960s, our factory independently developed, designed, and manufactured my country's first fully continuous hot-dip galvanized steel pipe production line. At present, our factory has five high-frequency welded pipe production lines (φ19-φ219mm), two hot-dip galvanizing production lines, two steel-plastic composite pipe production lines, two cold-drawn pipe production lines and four large and small slitting units. The annual output reaches more than 120,000 tons. The registered trademark of our products is "Yinhe" brand.