CONTINUOUS HEAT TREATING PROCESS FOR LOW-CARBON STRUCTURAL STEELS IN BAR FORM

摘要

An improvement in a process for preparing a structural steel having a maximum carbon content of 0.26 weight percent, the balance comprising iron, wherein the steel is continuously heated with the use of rapid heating, followed by quenching, the improvement comprising heating the steel only in its shell to a temperature between Acl and 1,300 DEG C such that the core heats up at an average rate of at least 100 DEG C/sec. up to a temperature between incipient pearlite transformation (Acl) and 900 DEG C, and thereafter, but prior to the attainment of equilibrium with respect to the carbon content, quenching said steel.