关键词: HFW 钢管; 制管工艺; 铣边; 成型; 高频焊接; 特殊领域用管

Abstract: HFW steel pipe has a series of advantages, such as high precision of outside size, good homogeneity of wall thickness, costeffectiveness and high efficiency. Its application extends into a number of areas of seamless steel pipe. HFW steel pipe developed by Yangzhou Steel Pipe Company is a technological leader in the key production processes like edge milling, forming and high-frequency contact welding process. The edge milling machine adopts the tilting cylindrical cutting tool. The cutter has a diameter of 850mm. FFX forming technology can easily adjust the type of steel pipe with a reasonable structure. The new-type double electrode contact welding equipment can adjust pressure in an elastic way to reduce the scars caused by the electrode on the surface of steel pipe and prevent the electrode from being damaged. Based on the market demands and optimization of product categories, the company has completed development and production of various steel pipes dedicated to special applications, such as casings for ore pulp transmission, lowtemperature stations, low yield ratio, anti-acid steel pipes for ultra-high voltage electric transmission tower, X70M high-quality steel pipe and expandable casings. They filled the domestic blanks in many application areas of HFW steel pipes.

Key words: HFW steel pipe, pipe manufacturing process, edge milling, forming, high-frequency welding, pipes for special purposes