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              In order to develop own characteristic products, the Company has researched and developed many kinds of large diameter pipes having higher technology, such as carbon steel pipes, casing and tubing for well and alloy steel pipes for high pressure boiler. Right now, the pipes having 159, 168, 219 mm in outside diameter are mass-manufactured。

            Seamless Steel Pipes for using as casing and tubing for wells
            Size: 60.32~ 127 mm O.D. × 4.83~15 mm W.T.
            Grade: J55 / N80 Type 1
            Length: 12 meter max.
            Standard: API Specification 5CT 8th Edition, July 1, 2005
            API License No.: 5CT-0661
            Technical & Quality Features:

            They are manufactured by hot-rolling or cold drawn process, using special alloy steel billets. The mechanical properties are stable and uniform due to being heat treated in computer-controlled furnace. All the pipes are tested by UT, ET or Hydrostatical test facilities.

            Seamless Steel Pipes for high pressure boiler:
            Size: 28~219 mm O.D. × 2~30 mm W.T.
            Grade: 20G, 15CrMoG, 12Cr1MoVG, SA-210 A1/C, SA-556 C2, SA-213 T12/T22
            Length: 12.5 meter max.
            Standard: GB 5310, ASME SA-210/556/213

            Technical & Quality Features:
              They are manufactured by hot-rolling or cold drawn process, using special billets for seamless steel pipes which can withstand high pressure. The pipe dimensions are quite accurate and the appearance is free defects due to having used special alloy moulds for drawing. The mechanical properties and metallographic microstructure of the pipes are stable and uniform due to being heat treated in computer-controlled furnace. All the pipes are tested by UT, ET or Hydrostatical test facilities.
              The pipes have been awarded “Golden Cup Prize” for their actual quality by China Iron & Steel Association and the State General Administration of the People’s Republic of China for Quality Supervision and Inspection and Quarantine exempts the pipes quality surveillance inspection in 2005.
            Seamless Steel Pipes, Heavy Wall Thickness, Hot-Rolling
            Size: 89~194 mm O.D. × 20~50 mm W.T.
            Grade: 10#, 20#, 45#, Q345, 45Mn2
            Length: 12 meter max.
            Standard: GB/T 8162, GB/T 8163, GB 3087
            Technical & Quality Features:
              They are manufactured by hot-rolling process, using special carbon steel or alloy steel billets which are cut in required length by gig saw and heated in the rotary heating furnace (diameter 16 m). The special piercing technique for manufacturing heavy wall thickness pipes, the special elongation process without any mandrel and the particular sizing mills have been used. The pipe dimension are quite accurate. They can widely be used for mechanical, general engineering, structural and pressure purposes.
              The State General Administration of the People’s Republic of China for Quality Supervision and Inspection and Quarantine exempts the pipes quality surveillance inspection in 2005.

             

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