This inventor holds 2 USPTO granted patents and 1 published patent application, plus 1 CIPO patent and 3 EPO patents. Top assignee: Jfe Steel Corporation. Active years: 2018-2019.
Location History:
- Tokyo, JP (2018)
- Handa, JP (2019)
Company Filing History:
Years Active: 2018-2019
Title: Tetsu Nakahashi: Innovator in High-Strength Stainless Steel Pipes
Introduction
Tetsu Nakahashi is a notable inventor based in Handa, Japan. He has made significant contributions to the field of materials engineering, particularly in the development of high-strength stainless steel pipes. With a total of two patents to his name, Nakahashi's work is recognized for its innovative approach to manufacturing and material properties.
Latest Patents
Nakahashi's latest patents include a high-strength seamless stainless steel pipe designed for oil country tubular goods. This invention is characterized by its excellent hot workability, sulfide stress cracking resistance, and corrosion resistance. The steel pipe's chemical composition includes chromium and nickel, ensuring that the relationship Cr/Ni is maintained at 5.3 or lower. The microstructure of the pipe primarily consists of a tempered martensite phase, with a surface layer that exhibits a unique white appearance when subjected to Vilella etching. The thickness of this surface layer ranges from 10 to 100 micrometers and occupies more than 50% of the area fraction on the outer surface.
Additionally, Nakahashi has developed a method for manufacturing this high-strength stainless steel pipe. This method involves forming a steel pipe with a specific size and composition, followed by a quenching treatment performed multiple times. The quenching process requires reheating the steel pipe to temperatures above 750°C and cooling it to below 100°C at a rapid rate. A tempering treatment is then applied, where the steel pipe is tempered at temperatures of 700°C or lower.
Career Highlights
Tetsu Nakahashi is currently employed at JFE Steel Corporation, a leading company in the steel industry. His work has significantly advanced the capabilities of stainless steel products, particularly in applications requiring high strength and durability.
Collaborations
Nakahashi has collaborated with esteemed colleagues such as Yasuhide Ishiguro and Hideo Sato. Their combined expertise has contributed to the successful development of innovative materials and manufacturing processes.
Conclusion
Tetsu Nakahashi's contributions to the field of high-strength stainless steel pipes exemplify the importance of innovation in materials engineering. His patents reflect a commitment to enhancing the performance and reliability of steel products in demanding applications.