China's first "SG/720 seamless steel tube four-roller heat reduction reducer" was successfully launched in Dalian Sangao Group, and will soon be shipped to the "World Steel Pipe Industry Boss" - Tianjin Pipe Group Co., Ltd. It is installed in the production line for the production of West-East Gas Pipeline. Its downline not only breaks the situation that all three mainframes in China's seamless steel pipe production line rely on imports, but also makes China's seamless steel pipe rolling equipment production rank first in the world.
As a high-tech private enterprise, Dalian Sangao Group has been committed to the research and development and creation of steel pipe processing equipment for more than ten years. In 2001, the company and Germany MEER and China's heavy, too heavy and other well-known enterprises at home and abroad open bidding, the results of Tangshan Fengnan Iron and Steel Company diameter of 122 cm straight seam submerged arc welded pipe large caliber (in the past three years, the company's annual sales revenue The proportion of 3% to 5% is for special science and technology funds. At present, 26 patent technologies have been obtained, and nearly 80 technologies are being declared.
According to reports, the production of seamless steel pipe consists of three main machines: piercing machine, rolling mill and heat-reducing reducer. Previously, the three mainframes that China needed were all dependent on imports. The heat reduction reducer mainly completes the last processing step of seamless steel pipe production. In the 100-year history of seamless steel pipe production, the heat reduction reducer has evolved from the original two-roller to the three-roller type and has been used today. Compared with the former two, the four-roller heat-reducing reducer has the advantages that when rolling steel pipes of different specifications, only the rolls are changed, and the roll stands are not changed; the grinding of the rolls requires only ordinary lathes; the thickness and diameter ratio of the rolls are three. The roller type is 15%~20% small, and the equipment volume is greatly reduced.
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