Rail manufacturing method and manufacturing equipment

摘要

This rail manufacturing method, which force cools at least the head of a hot rail that has been hot rolled at or above the austenite region temperature or has been heated to at least the austenite region temperature: performs forced cooling so that the head surface cooling rate is 1°C/sec to 20°C/sec for ten seconds after beginning the forced cooling; performs forced cooling so that, after ten seconds have elapsed from the beginning of the forced cooling, the head surface cooling rate is 1°C/sec to 5°C/sec until the head surface begins generating transformation heat; considers the head to be undergoing transformation for the period from the beginning of transformation heat generation until completion of transformation heat generation and performs forced cooling during the transformation so that the head surface cooling rate is less than 1°C/sec or the rate of temperature increase is not more than 5°C/sec; and after completion of the transformation heat generation, performs forced cooling so that the head surface cooling rate is 1°C/sec to 20°C/sec until the rail head surface temperature reaches 450°C or less.