Company Filing History:
Years Active: 2021-2022
Title: **Tetsuya Hirashima: Innovator in Hot Rolled Steel Technology**
Introduction
Tetsuya Hirashima is an esteemed inventor based in Tokyo, Japan, known for his groundbreaking contributions to the field of materials engineering. With a remarkable portfolio of seven patents, Hirashima has made significant strides, particularly in the production of hot rolled steel sheets, which are essential for various industrial applications.
Latest Patents
Among his latest inventions, Tetsuya Hirashima has developed a hot rolled steel sheet that comprises a carefully predetermined composition. This innovative steel features ferrite with an average orientation difference in the same grain ranging from 0.5 to 5.0 degrees, making up 30 to 70 vol %. The combined percentage of ferrite and martensite exceeds 90 vol %, with a balance microstructure limited to 10 vol % or less. Moreover, the average grain size of ferrite is between 0.5 to 5.0 micrometers, while the average grain size of the martensite and the residual microstructure lies between 1.0 to 10 micrometers.
Hirashima's method for producing this hot rolled steel sheet includes rolling techniques that involve two or more consecutive passes, wherein the rolling is conducted under specific temperature conditions, strain rates, and timing between passes. The careful execution of these parameters facilitates a robust cooling rate and ensures the coiling of the steel sheet is done at optimal temperatures.
Additionally, he holds a patent related to hot-rolled steel sheets with a predetermined chemical composition, involving a metallographic structure that includes 90 vol % or greater of martensite. This invention stipulates extensive specifications about the prior austenite grain sizes and the residual structures, which comprise bainite and ferrite.
Career Highlights
Tetsuya Hirashima contributes his expertise to Nippon Steel Corporation, a leader in steel production known for its innovation in materials technology. His role at the company has allowed him to work on cutting-edge projects, particularly in improving the manufacturing processes of steel.
Collaborations
Hirashima collaborates with esteemed colleagues such as Takeshi Toyoda and Riki Okamoto. Together, they push the boundaries of metallurgical science, working to refine the properties and production techniques of steel materials for varied industrial needs.
Conclusion
As an inventor at the forefront of hot rolled steel technology, Tetsuya Hirashima exemplifies the spirit of innovation in Japan's engineering landscape. His contributions not only enhance the properties of steel but also pave the way for advancements in manufacturing and production processes within the steel industry.