China's galvanized steel pipe production and development review in the early 1940s, Japanese businessmen operating China's Anshan Iron and Steel Company, China's first hot-rolled galvanized steel pipe machine formally completed and put into operation. After the victory of the war of resistance against Japan, the production equipment of seamless steel was repatriation from the former Soviet Union. In the 1950s, Anshan Iron and Steel Co. reintroduced new equipment from the former Soviet Union to rebuild and put into operation. At present, the designed annual production capacity of Anshan Iron and Steel Co. is 60,000 tons. It is one of the three major projects to restore production in Anshan Iron and Steel Co. and the only hot-rolled galvanized steel pipe mill in China at that time. Since then, a number of domestic 76mm diameter galvanized steel pipe machines have been built, but because of backward technology, few specifications, the output is very low.
In the 1980s, with the spring breeze of reform and opening up, Baoshan Iron and Steel Co., Ltd. of Shanghai, built the first domestic mandrel mill with a diameter of 140 mm for galvanized steel pipes. The designed annual production capacity was 500,000 tons. In the early 1990s, China's galvanized steel pipe production units entered a period of great development. Three influential galvanized steel pipe production bases, Tianjin Galvanized Steel Pipe Company, Chengdu Galvanized Steel Pipe Company and Hengyang Hualing Steel Pipe Company, were established in succession in China. Baosteel is the largest and most modernized iron and steel complex in China, and one of the most competitive iron and steel enterprises in the world.
Two, the construction of galvanized steel pipe production line in China is characterized by rapid growth in output. China has become the world's largest producer of galvanized steel pipes. Since 1993, China's production capacity has reached 2.84 million tons, surpassing Russia, becoming the world's largest producer of seamless pipes, and has been maintained until now. Since 2000, the output of seamless pipe has increased rapidly from 4 million 148 thousand tons to 21 million 786 thousand tons in 2009. Baosteel Co., Ltd. alone produces more than 11 million tons of steel annually. It specializes in producing world-class high-tech, high-value-added cold, hot-rolled and galvanized steel pipes and other high-quality products, which are widely used in automobile manufacturing, household appliances production, petroleum exploration, pipeline transportation and other fields at home and abroad.
Two, advanced level of equipment. After 2000, the transformation and upgrading of China's galvanized steel pipe production line has become more and more rapid, basically using the most advanced contemporary equipment. For example, in 2003, Tianjin Galvanized Steel Tube Company developed and manufactured the world's first PQF three-high continuous rolling mill, which was subsequently widely promoted and applied both at home and abroad. At present, China has also begun to generally adopt such international advanced technologies as conical roller piercing machine, centralized deformation roller design, full hydraulic roll reduction technology, limited mandrel rolling, single roller drive, step mandrel rolling and so on.
The three is the specialization of production bases. China's galvanized steel pipe production base is gradually on a professional track, such as: Tianjin seamless, Chengdu seamless, Hengyang seamless and other domestic production companies, whether raw materials, steelmaking, refining and continuous casting, rolling, or finishing, inspection and testing, heat treatment and other research and development work, are all around the galvanized steel pipe production, which is effective for production. Rate, quality improvement and new product development all play a very important role. In particular, many domestic conglomerates generally adopt specialized galvanized steel pipe production lines from steelmaking to finished products. The four is the rich variety of products. The big mouth galvanized steel pipe is no longer a shortage variety, and the high-end products which rely on import and export are greatly reduced. In addition to a few products such as deep-well drilling pipes, bottom pipes, high-pressure boiler pipes and high-strength pipeline pipes, other products can be supplied independently. The import of seamless pipes has declined year by year from 694,000 tons in 2006 to 349,000 tons in 2009.
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