JFE Steel Pipe Production and Processing Technology
2014-12-08
To ensure the performance and quality of the raw material for UOE welded pipes—medium-thick plates, JFE Steel Corporation has applied online super cooling (Super-OLAC) technology and online heat treatment (HOP) technology at its Fukuyama plant in western Japan. The Super-OLAC technology has three characteristics: 1) It achieves the highest cooling speed within the theoretical limits of water cooling; 2) The temperature deviation within the steel plate is the same as that of non-water-cooled materials, while achieving symmetrical cooling on both surfaces and uniform cooling inside the steel plate; 3) By refining the cooling section, it significantly improves the accuracy of the stopping temperature under high cooling speeds.
The HOP technology is an online heat treatment technology that uses efficient induction heating. Combined with Super-OLAC technology, it forms a rolling line capable of free cooling and free heating, allowing for online quenching and tempering processes while increasing flexibility in microstructure control, greatly improving the quality of thick plates. High-quality raw materials supply JFE Steel Corporation's UOE welded pipe production line, producing high-quality, high-grade pipeline products.
To achieve weight reduction in automotive bodies and improve collision safety, JFE Steel Corporation developed a new steel pipe manufacturing technology—HISTORY, which was put into practical production in October 2000. The characteristics of this technology include: 1) Through microstructure control, it can simultaneously achieve high strength and high processability; 2) Under conditions without heat treatment, hardness is uniform in the circumferential direction (including welds); 3) It reduces the amount of alloying elements added, resulting in excellent welding performance; 4) Using a four-roll tension-reducing machine allows for the production of highly round and low eccentricity steel pipes. By using this technology to roll welded pipes instead of bars for automotive chassis components, vehicle weight can be reduced by 20% to 30%.
The high-strength steel pipe bending processing technology (PRB) is mainly used for processing high-strength steel pipes with a grade above 590MPa. It is a new concept processing technology that applies pressure along the centerline direction of the steel pipe while bending during diameter reduction. This technology not only suppresses local thinning during processing but also enables small radius bending of high-strength steel pipes. Currently, JFE Steel Corporation has successfully processed 780MPa grade resistance-welded steel pipes into components used for automotive front lower arms, enhancing vehicle safety.
Shenyang Tengfei Iron Corporation
Shenyang Tengfei Steel Pipe Co., Ltd.
Address: No.6 A 3, No.13 Road, Economic and Technological Development Zone, Shenyang City, Liaoning Province
E-mail:tfwelcome@163.com
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