Patent ID: 11531060

Abstract:
The cylindrical member includes a cylindrical base material 40 made of beryllium copper, a first coating layer that is formed on the base material 40 and made of a Ni-based material and serves as a reinforcing material for the base material 40, and a second coating layer 42 that is formed on the first coating layers and made of a metal-based material different from the base material 40, wherein the first coating layer 41 has higher hardness than the base material 40, when the thickness of the base material 40 is represented by TB and the layer thickness of the first coating layer 41 formed on the outer surface is represented by T1OUT, the base material 40 is formed so as to satisfy 13 μm≤TB≤25 μm, and the first coating layer 41 is formed so as to satisfy T1OUT≥TB×4%.