Mutsuhisa Nagahama

Title: Mutsuhisa Nagahama: Innovator in Bearing Steel Technology

Introduction

Mutsuhisa Nagahama is a prominent inventor based in Kobe, Japan. He has made significant contributions to the field of materials science, particularly in the development of advanced bearing steel. With a total of 7 patents to his name, Nagahama's work has had a substantial impact on the industry.

Latest Patents

One of Nagahama's latest patents focuses on a unique bearing steel that exhibits excellent cold workability following spheroidizing annealing. This innovative material ensures outstanding abrasion resistance and rolling fatigue characteristics, making it ideal for use as a bearing member. The chemical composition of this bearing steel includes C: 0.9 to 1.10%, Si: 0.05 to 0.49%, Mn: 0.1 to 1.0%, P: not more than 0.05%, S: not more than 0.05%, Cr: 0.03 to 0.40%, Al: not more than 0.05%, N: 0.002 to 0.025%, Ti: not more than 0.0030%, and O: not more than 0.0025%, with the remainder being iron and unavoidable impurities. The average aspect ratio of cementite is not more than 2.00, and the average circle-equivalent diameter of cementite ranges from 0.35 to 0.6 μm.

Another notable patent involves a bearing steel material with excellent rolling contact fatigue properties. This material features a carefully adjusted chemical composition and an average chemical composition of oxide inclusions comprising 10 to 45% of CaO, 20 to 45% of AlO, 30 to 50% of SiO, up to 15% of MnO, and 3 to 10% of MgO, with the balance being unavoidable impurities. The maximum major axis diameter of the oxide inclusions in a longitudinal section of the steel material is 20 μm or less, and it possesses a spheroidal cementite structure.

Career Highlights

Mutsuhisa Nagahama is currently associated with Kobe Steel, Ltd., where he continues to innovate in the field of materials science. His work has been instrumental in advancing the performance and reliability of bearing materials used in various