THERMIT WELDING JOINT OF BAINITE STEEL RAIL

摘要

PROBLEM TO BE SOLVED: To provide a thermit welding joint of a bainite steel rail whose partial wear and surface damage are less brought about.;SOLUTION: Vickers hardness number of welded metal ranges 200-500, and 70 vol.% or more of the micro texture has bainite structure. Ccq shown in the (1) expression in the welded metal ranges 0.5-1.5 wt.%, Ccq(%)=C%+Si%/24+ Mn%/6+Ni%/40+Cr%/5+Mo%/4+V%/16.... (1). Further, The difference of respective Vickers hardnesses of the welding metal and the rail steel base metal is -50 or larger and +70 or smaller.;COPYRIGHT: (C)2001,JPO