Yoshifumi Ohata

Title: Innovations of Yoshifumi Ohata in Electrical Steel Production

Introduction

Yoshifumi Ohata is a notable inventor based in Kitakyushu, Japan. He has made significant contributions to the field of electrical steel production, particularly through his innovative methods that enhance magnetic properties.

Latest Patents

Ohata holds a patent for a method for producing a grain-oriented electrical steel sheet that excels in magnetic properties. This method involves several steps, including heating a slab containing a prescribed amount of aluminum to a temperature of 1,200°C or higher. The process continues with hot-rolling the slab into a hot-rolled strip, followed by necessary annealing, cold-rolling with intermediate annealing, and decarburization annealing of the cold-rolled sheet. The final step includes box annealing after applying an annealing separator to prevent strip sticking during the annealing process. A key feature of this method is heating the slab to a temperature higher than the complete solution temperature of substances that act as inhibitors, along with nitriding treatment of the decarburization annealed steel sheet before secondary recrystallization during final box annealing.

Career Highlights

Yoshifumi Ohata is associated with Nippon Steel Corporation, where he has been instrumental in advancing the production techniques of electrical steel. His work has contributed to the development of materials that are essential for various electrical applications.

Collaborations

Ohata has collaborated with notable colleagues, including Tomoji Kumano and Norikazu Fujii, to further enhance the innovations in electrical steel production.

Conclusion

Yoshifumi Ohata's contributions to the field of electrical steel production through his patented methods demonstrate his commitment to innovation and excellence. His work continues to influence the industry positively.