Chie Hama

Title: Chie Hama: Innovator in Electrical Steel Manufacturing

Introduction

Chie Hama is a prominent inventor based in Tokyo, Japan. She has made significant contributions to the field of electrical steel manufacturing, holding 2 patents that showcase her innovative methods. Her work is particularly relevant in the production of grain-oriented electrical steel sheets, which are essential for various electrical applications.

Latest Patents

Chie Hama's latest patents include a manufacturing method for grain-oriented electrical steel sheets. One of her notable inventions involves a predetermined steel containing tellurium (Te) in a specific mass percentage. This steel is heated to 1320°C or lower, followed by a series of processes including hot rolling, annealing, cold rolling, decarburization annealing, and nitridation annealing. The result is a decarburized nitrided steel sheet, which is then treated with an annealing separating agent to form a glass coating film. The N content of the steel sheet is carefully controlled to establish a relationship between the Te and N contents.

Another patent focuses on a method of manufacturing grain-oriented electrical steel sheets that includes a nitriding treatment. This method adopts low-temperature slab heating, setting the finish temperature of hot rolling to 950°C or below. The cooling process is initiated within 2 seconds after rolling, ensuring that the steel strip is coiled at 700°C or below. The cooling rate is maintained at 10°C per second or above, while the heating rate during annealing is set to 5°C per second or above.

Career Highlights

Chie Hama is currently employed at Nippon Steel & Sumitomo Metal Corporation, where she continues to innovate in the field of electrical steel manufacturing. Her expertise and dedication have positioned her as a key figure in her company and the industry at large.

Collaborations

Chie has collaborated with notable coworkers such as Yoshiyuki Ushigami and Kenichi Murakami. These partnerships have further enhanced her research and development efforts in electrical steel technologies.

Conclusion

Chie Hama's contributions to the manufacturing of grain-oriented electrical steel sheets demonstrate her innovative spirit and technical expertise. Her patents reflect a commitment to advancing the field and improving manufacturing processes.