Fatigue characteristics and vibration-damping properties to the excellent mechanical structural steel parts

摘要

PROBLEM TO BE SOLVED: To produce steel for machine structure exhibiting excellent damping properties even after working without exerting undesirable influence on its strength characteristics, wear resistance, or the like, and to provide steel parts for machine structure. ;SOLUTION: The area ratio of graphite occupied in the steel structure is 2 to 15%, also, the maximum grain size of graphite is ≤30 μm, and, as the main components, by weight, 0.1 to 2% C, ≤3.0% Si, ≤3.0% Mn, ≤0.03% P, ≤0.1% S, 0.0003 to 0.015% B, ≤0.5% Al and 0.001 to 0.03% N are contained.;COPYRIGHT: (C)2000,JPO