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 Tianjin Seamless Steel Pipe Plant, established in 1958, is a large professional enterprise producing seamless pipe. Now it has over 2400 employees and a land space of 1234568m2, with advanced technology and equipment and a perfect quality assurance system. Since it passed the ISO9001 quality system certification in 1998, the plant has also obtained the works approval certificate of China Classification society, and been authorized to use the API monogram. The plant has under itself a hot-rolled pipe sub-plant ,special steel pipe sub-plant,cold-drawn pipe sub-plant pipe finishing sub-plant ,correspondingly forming four production lines of hot-rolled and cold-drawn pipe,production line of heat treatment producing high grade special pipe for petroleum service and production line of pipe finishing.

The works has gone through an over 40-year history of development. Especially in recent years, aiming at the domestic and international markets, it has carried out scientific and technological innovation, and successively invested RMB 200 million yuan in introducing in technology, equipment, and management mode, advanced in China and in the world, to perform large-scale technical transformation and product structural adjustment. Now it has formed a production capacity of annual output of 110000 tons of seamless steel pipes in three big series of more than 20 varieties and over 1000 norms. The product norms of the hot-rolled pipe production line are in a range ofΦ25-159mm×3.5-20mm. The main production equipment include the AM450 new-type pipe rolling machine set imported from German Mannesmann Demag-Mill Company ; the distributed control system (DCS) imported from the United States and applied to the 16m medium-diameter ring heating furnace, which is used to conduct automation control of the combustion and production process; and the accessory 24 SRM270 stretch reducers imported from German Kocks Company. The product norms of the cold-drawn pipe production line are in a range of Φ10-76mm×1.5-10mm. The main equipment include 76mm punching machine set, the roller-type continuous annealing furnace, and the 10-65t chain cold-drawn machine of LB series. The  product norms of the special steel pipe production line are in a range ofΦ10-76mm×1.5-10mm. The main equipment include the 76mm twice punching machine set, the car-bottomannealing furnace, the rolled-type continuous annealing furnace, the LB200t hydraulic cold-drawn machine, the 10-50t chain cold-drawn machines of LB series, and the LG30-80 roller-type cold drawn machines. The manufacturing of these three big series of products can be organized in accordance with the national standards (GB) or with the foreign advanced standard of as ISO, DIN, ASTM, and JIS.

This works has a complete set of inspection instruments. It uses supersonic and eddy current testing equipment and hydraulic cold testing equipment to conduct ex-factory inspection of the products. The “Double-Ladder” brand seamless steel pipe for tubing and casing. Seamless steel tubs and pipes for high pressure boiler and ship. Seamless steel tubes for hydraulic pillar serviceautom otive axle housing, low and medium pressure, liquid service and structural purposes, special-shape steel pipe, cold-rolled seamless steel tubes, that are broadly use din oil field, mining, auto industry, machinery, electric power, shipbuilding, and boiler manufacturing. Part of them areexported abroad.

This works has always pursued the aim of “perfection and reciprocal benefit” and is willing to provide first-rate products and services for its old and new Chinese and foreign customers.
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