Manufacturing method for improving thin-gauge production stability of hot-rolled wear-resistant steel BH550MC

• Main Authors: SUN LIRONG, WANG NANHUI, FUMIO, ZHANG WEIGUO, DONG QIANG, WANG KEZHU, BAN XIAOYANG, LIU YANG, WAN JIAFENG, WANG FENG, LI HE
• Format: Patent
• Language: Chinese; English
• Published: 04.03.2022
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a manufacturing method for improving thin-gauge production stability of hot-rolled wear-resistant steel BH550MC. The manufacturing method comprises the following steps: a plate blank heating procedure: heating a steel billet at the tapping temperature of 1250 DEG C for 40 minutes and the total in-furnace time of 220-240 minutes; in the rough rolling process, an R1 two-roller reversible mill and an R2 four-roller reversible mill are adopted for conducting 1 + 5-pass rolling, the rough rolling cumulative reduction rate is 86%, and the rough rolling outlet temperature is 1110-1140 DEG C, in the finish rolling process, a seven-rack four-roller finish rolling unit is adopted for accelerating rolling, the rolling speed is 6.1-9.0 m/s, the finish rolling cumulative reduction rate is 91%, and the finish rolling temperature is 890 DEG C; in the cooling process, a front-section ultra-fast cooling and laminar flow sparse cooling mode is adopted, the strip steel is cooled to 630-640 DEG C, the ult