Hiromu Fujii

Title: **Hiromu Fujii: Innovator in Electrical Steel Production**

Introduction

Hiromu Fujii is a prominent inventor based in Himeji, Japan, known for his contributions to the field of electrical steel production. With a total of three patents to his name, Fujii has played a significant role in advancing manufacturing processes within the steel industry.

Latest Patents

Fujii's latest patents include an innovative process for producing non-directional electrical steel sheets that are free from ridging. This invention involves making molten steel into slabs through continuous casting and subsequently hot-rolling the slabs. The process also includes cold rolling the hot-rolled product into its final thickness in a single step and subjecting it to decarburization annealing. The composition of the molten steel is crucial, consisting of no more than 0.02% carbon, between 1.5 to 4.0% silicon, and not more than 1.0% aluminum, with the rest being iron and unavoidable impurities. A critical improvement in this process is the electromagnetic stirring of the unsolidified molten steel, ensuring that at least 50% of the slab's central zone transitions into an equi-axed structure without recrystallization.

Another notable patent involves a process for continuous casting of slightly deoxidized steel slabs. Traditionally, producing semikilled and rimmed steel has been challenging due to rimming actions in the oscillating mold. Fujii's innovation focuses on suppressing bubble nuclei in the molten steel to enable the formation of a non-defective solidification layer. His method utilizes controlled free oxygen concentrations, mold shape adjustments, and electromagnetic flow to achieve solidification without blow holes.

Career Highlights

Fujii is affiliated with Nippon Steel Corporation, a leading player in the global steel industry. His work in optimizing processes for steel production has not only advanced the technological capabilities of the company but has also contributed to the broader field of materials science.

Collaborations

In his endeavors, Hiromu Fujii has collaborated with esteemed colleagues such as Morio Shiozaki and Yozo Suga. Their collective expertise has facilitated significant advancements in steel manufacturing practices, highlighting the importance of teamwork in driving innovation within industrial sectors.

Conclusion

Hiromu Fujii's contributions to electrical steel production through his innovative patents underscore his status as a leading inventor in his field. His dedication to improving manufacturing processes reflects a commitment to excellence that benefits both Nippon Steel Corporation and the broader steel industry.