Casing Tube factory Product Description W-series casing tubes (API drill pipe) are made as per DCDMA standards, the most popular sizes are AW, BW, NW, HW and PW, which are widely applied in geotechnial drilling. Raw Materials: We choose the best steel tubes in the market to manufacture our drill rods and casing pipes. Instant check will be conducted after the raw material is received in our factory so that it can make sure the compositions and specifications meeting applicable stardard requirements. Heat Treatment Control: Heat treatment will greatly make sure the material strength and the thread wear life of the drill rods and casings. We conduct either tru-wall or both ends heat treatment to the tube body. Thread Opening Process: Precision of threads will impact the use effects and serve time of drill rod and casings. CNC latches and form cutter are used in thread opening process to minimize error. Additional Thread Treatment: Surface of the threads will be cleaned to remove burr adhered after threads are opened. At last , the tread surface will be phosphated to improve surface conditions. Casing Tube and Core Tube Specifications SizeO.D x WT (mm)MaterialStandard AW桅57.4x4.4R780DCDMA BW桅73.2x6.35R780DCDMA NW桅89.1x6.35R780DCDMA HW桅114.3x6.35R780DCDMA PW桅139.7x7.10R780DCDMA Remark: Length and threads depend on customer's demands.Casing Tube factory website:http://www.china-zjtk.com/drill-rods-and-casings/casing-tube/