Location History:
- Chiyoda-ku, JP (2009)
- Tokyo, JP (2022 - 2024)
Company Filing History:
Years Active: 2009-2025
Title: Ryuji Muraoka: Innovator in Steel Material Technology
Introduction
Ryuji Muraoka is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of steel materials, particularly for line pipes. With a total of 4 patents to his name, Muraoka's work has advanced the understanding and production of high-performance steel.
Latest Patents
Muraoka's latest patents include innovations such as a steel material for line pipes, a method for producing the same, and the line pipe itself. The steel material features a specific composition that ensures optimal performance. The metallic microstructure of the steel at a ⅛-plate thickness position below the surface consists of bainite with an area fraction of 85% or more, polygonal ferrite of 10% or less, and martensite-austenite constituents of 5% or less. The compressive strength of this steel material reaches 340 MPa or more, even at a temperature of −10° C. or less, where a percent ductile fracture measured in a DWTT test becomes 85% or more.
The method for producing this steel material involves heating the steel to a temperature between 1000° C. and 1200° C. It includes hot rolling with a cumulative rolling reduction ratio of 60% or more in a non-recrystallization temperature range. The process also requires accelerated cooling at a rate of 10° C./s or more, followed by reheating to ensure the desired properties of the steel.
Career Highlights
Muraoka has worked with notable companies such as JFE Steel Corporation and Japan Marine United Corporation. His experience in these organizations has allowed him to refine his expertise in steel technology and contribute to innovative solutions in the industry.
Collaborations
Muraoka has collaborated with esteemed colleagues, including Kyono Yasuda and Tomoyuki Yokota. Their joint efforts have further propelled advancements in steel material technology.
Conclusion
Ryuji Muraoka's contributions to the field of steel materials, particularly for line pipes, showcase his innovative spirit and technical expertise. His patents reflect a commitment to enhancing the performance and production methods of steel, making a lasting impact on the industry.