Method for improving spheroidizing rate of annealing structure of high-carbon hot-rolled strip steel

• Main Authors: ZHANG SHILONG, ZHOU NA, XU BIN, LI BEI, WU XINLANG, LIU ZHI, LIU LANXIAO, JING HANWEN, BAI FENGXIA, LIU DONGWANG
• Format: Patent
• Language: Chinese; English
• Published: 11.11.2022
• Subjects: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING

The embodiment of the invention discloses a method for improving the annealing structure spheroidizing rate of high-carbon hot-rolled strip steel, and relates to the technical field of steel rolling production, the method comprises the following steps: 1) in a smelting stage, carrying out LF + RH duplex refining treatment on the strip steel for more than or equal to 40 minutes; (2) in the continuous casting stage, electromagnetic stirring is conducted in the continuous casting process, and a plate blank is obtained; (3) a forming stage: heating the plate blank in a heating furnace, controlling the temperature of the heating furnace to be greater than or equal to 1150 DEG C, and controlling the heating time to be greater than or equal to 160 minutes; and (4) a finish rolling stage, wherein the heated plate blank is subjected to multi-pass rough rolling and finish rolling, and then a target hot-rolled coil is obtained. An LF + RH duplex process, continuous casting electromagnetic stirring parameters, in-furnace