Takeji Asai

Title: Takeji Asai: Innovator in Stainless Steel Hardening

Introduction

Takeji Asai is a prominent inventor based in Toyama, Japan, known for his significant contributions to the field of materials engineering. He holds a total of four patents, showcasing his innovative approaches to enhancing the properties of stainless steel and iron-containing surfaces.

Latest Patents

One of Asai's latest patents is a process for case hardening martensitic stainless steels. This process involves creating a non-explosive atmosphere composed of 97.5% to 95% nitrogen gas, 0.5% to 1.5% carbon monoxide, and 2% to 3.5% hydrogen gas. The gases are produced through the heat decomposition of an organic solvent mixed with nitrogen gas. The martensitic stainless steel is then heated in this atmosphere at temperatures ranging from 900°C to 1100°C, allowing for nitriding to a predetermined depth. Following this, the steel is quenched at temperatures between 150°C and room temperature, resulting in enhanced resistance to planar pressure and increased strength, along with bright surfaces and high corrosion resistance.

Another notable patent by Asai involves a method for carbonitriding iron-containing surfaces using an atmosphere that includes ammonia and an oxygen-containing organic solvent. The method ensures that the ratio of oxygen to carbon atoms in the solvent is maintained between 0.5 and 1.5. This innovative approach not only increases the carbon and nitrogen content of the article's surface but also incorporates a method to detoxify harmful gases produced during the process.

Career Highlights

Asai's career is marked by his dedication to advancing materials science, particularly in the treatment of stainless steel and iron surfaces. His innovative methods have contributed to the development of stronger and more durable materials, which are essential in various industrial applications.

Collaborations

Throughout his career, Takeji Asai has collaborated with notable colleagues, including Kaishu Yamazumi and Teruyoshi Sakuta. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas.

Conclusion

Takeji Asai's work in the field of materials engineering has led to significant advancements in the treatment of stainless steel and iron-containing surfaces. His innovative patents reflect a commitment to enhancing material properties, making a lasting impact on the industry.