High Quality and Efficient Manufacturing Process Development of φ450 mm Rolled Round Bar

by Koji Kobashi

Publisher - JFE Steel Corporation, Japan

Category - Engineering & IT

"Before the billet mill was modified in 2011 at JFE Steel West Japan Works (Kurashiki), the diameter range of conventional round bar was φ90 to 420 mm. In order to improve productivity and respond appropriately to customer requirements by increasing the upper limit of bar diameter and enhancing the quality assurance system, JFE Steel modernized the mill in following three areas: (1) Modifying roll caliber design and application of slow-pass rolling, (2) Introduction of non-contact type manual magnetic tester for better quality assurance, and (3) Modification of automatic ultrasonic tester for higher speed inspection of inner flaw. Finally, high-quality and high-productivity production system of round bars with increased upper limit of diameter to φ450 mm has been established."

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