Yasuhiro Harada

Title: Yasuhiro Harada: Innovator in Heat Resisting Steel

Introduction

Yasuhiro Harada is a notable inventor based in Hitachinaka, Japan. He has made significant contributions to the field of materials science, particularly in the development of heat resisting steel. His innovative work has led to advancements in the manufacturing of steam turbine rotor shafts.

Latest Patents

Yasuhiro Harada holds a patent for a heat resisting steel and steam turbine rotor shaft, which is characterized by a unique metal structure entirely composed of the martensite phase produced through tempering after quenching. The composition of this steel includes, by weight, 0.05 to 0.20% carbon, not more than 0.15% silicon, not more than 1.5% manganese, not more than 1.0% nickel, 8.5 to 13.0% chromium, not more than 3.50% molybdenum, not more than 3.5% tungsten, 0.05 to 0.30% vanadium, 0.01 to 0.20% niobium, not more than 5.0% cobalt, 0.001 to 0.020% boron, 0.005 to 0.040% nitrogen, 0.0005 to 0.0050% oxygen, and 0.00001 to 0.0002% hydrogen. This steel exhibits a creep rupture strength of 10 kgf/mm² or more at 650°C for 100,000 hours, making it highly durable for industrial applications.

Career Highlights

Throughout his career, Yasuhiro Harada has worked with prominent companies such as Hitachi, Ltd. and The Japan Steel Works, Ltd. His experience in these organizations has allowed him to refine his expertise in materials engineering and contribute to various innovative projects.

Collaborations

Yasuhiro has collaborated with esteemed colleagues, including Masao Shiga and Kishio Hidaka. Their combined efforts have further advanced the field of heat resistant materials and their applications in engineering.

Conclusion

Yasuhiro Harada's contributions to the development of heat resisting steel have made a significant impact on the industry. His innovative patent and collaborations with leading professionals highlight his role as a key figure in materials science.