Company Filing History:
8 out of 1,256 
1 out of 2 
1 out of 1,800 
Years Active: 1988-2004
Title: Masato Kumagai: Innovator in Stainless Steel and Chromium Processing
Introduction
Masato Kumagai is a notable inventor based in Chiba, Japan, recognized for his contributions to the field of metallurgy and environmental engineering. He holds a total of 9 patents, showcasing his innovative approaches to processing materials in the steel industry.
Latest Patents
Kumagai's latest patents include a method for treating stainless steel refining slag. This method involves adjusting the slag in a molten state to achieve a basicity range of 1.3-4.0. The slag is mixed with a sulfur-containing material, ensuring that the sulfur concentration is not less than 0.2% by weight. This modification effectively prevents chromium from being eluted, allowing the slag to be utilized as a roadbed material and for civil works. The cooling process of the slag is also critical, as it must decrease from 1200°C to 400°C within 48 hours to achieve noticeable effects.
Another significant patent involves a method for processing chromium oxide-containing substances in large quantities. This method simplifies the reduction of chromium oxides using elementary sulfur or sulfur compounds with a valence less than 6. The process allows for the effective use of blast furnace slag, which is abundant in the iron industry, to reduce chromium oxides in various ways, including spraying or immersing the substances in water released from cooling blast furnace slag.
Career Highlights
Throughout his career, Masato Kumagai has worked with prominent companies such as Kawasaki Steel Corporation and Kawasaki Steel Metal Products & Engineering Inc. His experience in these organizations has significantly contributed to his expertise in metallurgy and environmental solutions.
Collaborations
Kumagai has collaborated with notable coworkers, including Hisahiro Matsunaga and Yasumasa Fukushima. Their joint efforts have further advanced the innovations in the field of steel processing and environmental engineering.
Conclusion
Masato Kumagai's innovative methods in treating stainless steel refining slag and processing chromium oxide-containing substances highlight his significant contributions to metallurgy. His work not only enhances industrial processes but also promotes environmental sustainability.