STEEL FOR HIGH STRENGTH MECHANICAL STRUCTURE AND TRACK LINK FOR ENDLESS TRACK CATERPILLAR BAND

摘要

PROBLEM TO BE SOLVED: To provide a steel for high strength mechanical structure excellent in delayed fracture characteristic and suitable as a material for a track link for endless track caterpillar band and the track link for endless track caterpillar band.;SOLUTION: There is provided the steel for high strength mechanical structure having a chemical composition consisting of, by wt.%, C 0.30 to 0.45, Si 0.15 to 0.50, Mn 0.15 to 0.85, P 0.030 or less, S 0.030 or less, Cu 0.30 or less, Cr 0.65 to 1.35, Ti 0.010 to 0.070, Al 0.015 to 0.070, V 0.05 to 0.20, B 0.0005 to 0.0050 and the balance practically iron with inevitable impurities and excellent in delayed fracture characteristic.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2017,JPO&INPIT