Method for controlling side bending in heat treatment process of asymmetric large-section steel rail

• Main Authors: ZHENG JIANGUO, WANG JUN, OUYANG MINLU, WANG RUIMIN, FEI JUNJIE, DONG MAOSONG, LIU FANGMING, ZHOU JIANHUA, YU XUANCAI, ZHU MIN
• Format: Patent
• Language: Chinese; English
• Published: 29.09.2023
• Subjects: CHEMISTRY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

The invention discloses a method for controlling side bending in the heat treatment process of an asymmetric large-section steel rail, which comprises the following steps: S1, dividing the rail bottom of the asymmetric large-section steel rail into three areas I, II and III, and carrying out accelerated cooling on the rail bottom in the whole process in a heat treatment unit with the cooling speed of the area I being 1.5-3.5 DEG C/s, the cooling speed of the area II being 3-5.5 DEG C/s and the cooling speed of the area III being 1-3 DEG C/s; s2, when the steel rail is taken out of a cooling unit, TII is controlled to be 380-420 DEG C, TI is controlled to be 365-395 DEG C, TIII is controlled to be 375-405 DEG C, TII-TI is smaller than or equal to 25 DEG C, TII-TIII is smaller than or equal to 15 DEG C, and TIII-TI is smaller than or equal to 20 DEG C. The side face bending of the steel rail out of the heat treatment unit is smaller than or equal to 0.8 mm/m, and the situation that the steel rail cannot normall