| 摘要 |
PROBLEM TO BE SOLVED: To produce a bainitic steel rail having excellent rolling fatigue damage resistance as well as having joinability, at the time of rail welding, e.g. by flash butt welding or gas pressure welding, equal to that of the conventional pearlitic rail steel, and its production. SOLUTION: The rail steel has a composition consisting of, by weight, 0.15-0.4% C, 0.1-0.2% Si, 0.15-1.1% Mn, <=0.035% P, <=0.035% S, 0.05-0.45% Cr, 0.005-0.15% Nb, 0.05-0.85% Mo, and the balance essentially Fe with inevitable impurities and satisfying Mn%/Si%<=5.5. In this case, a railhead has a bainitic structure, and both a railhead and railhead corners can be provided with uniform hardness distribution, and Vickers hardness is regulated to HV230 to 320. |
