Method of cooling rail weld zone, device for cooling rail weld zone, and rail weld joint

摘要

A method of cooling a welded rail section, the method comprising: a first column-section cooling step for cooling a region to be cooled of a column section of the welded rail section, the cooling being performed in at least a part of the temperature range in which the transformation from austenite to pearlite completes; a second column-section cooling step for cooling the region to be cooled of the column section after the entire column section of the welded rail section is transformed to the pearlite; a foot-section cooling step for cooling a foot section of the welded rail section; and a head-section cooling step for cooling a head section of the welded rail section. In the method, if the time period of cooling in the first column-section cooling step and the second column-section cooling step is t (min), the k-value satisfies the expression -0.1t + 0.63 ≤ k ≤ -0.1t + 2.33.