Geological Drilling square steel (YB235-70) is for geological department of square steel core drilling, use can be divided into the drill pipe, drill collar, core pipe, casing and precipitation tubes. Hunan square tube. Diamond core drilling large diameter Rectangular Pipe (GB3423-82) is a drill, core rods used for diamond core drilling large diameter casing Rectangular Pipe. 304 square tube. Galvanized square pipe is widely used in construction, machinery, coal, chemical, railway vehicles, the automotive industry, roads, bridges, containers, sports facilities, agricultural machinery, oil machinery, mining machinery and other manufacturing industries. Galvanized square pipe is widely used in construction, machinery, coal, chemical, railway vehicles, the automotive industry, roads, bridges, containers, sports facilities, agricultural machinery, oil machinery, mining machinery and other manufacturing industries. Stainless steel tube, around the steel association (certified), Hunan square tube from the Tianjin Steel Trade Co., Ltd. Mastery. Mastery of Tianjin Steel Trade Co., Ltd. (www.tjtdgl.com) (www.tdglgt.com) Shandong Liaocheng, steel leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Mastery Steel Union leaders in the staff warmly welcome all inquiries negotiations to create accessible VAI better future.