500MPa-grade bridge steel with anti-seismic property adapting to extremely cold regions and preparation process of 500MPa-grade bridge steel

• Main Authors: ZHANG QINGLONG, HE XIAOBO, WEI XIAN, XU BO, ZHAO LIANGSHENG, OU YANGYU, LI NA, SONG LIWEI, JI LIN, CHEN YINZE, HUANG ZHONG, SUN BIN
• Format: Patent
• Language: Chinese; English
• Published: 02.05.2023
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses 500MPa-grade bridge steel adapting to the anti-seismic property in an extremely cold region and a preparation process of the 500MPa-grade bridge steel. The bridge steel comprises the following chemical components in percentage by weight: 0.06 to 0.08 percent of C, 0.12 to 0.45 percent of Si, 1.60 to 1.70 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.015 to 0.060 percent of Nb, 0.010 to 0.060 percent of Al, 0.008 to 0.020 percent of Ti and the balance of Fe and inevitable impurities. According to the 500MPa-grade bridge steel with the anti-seismic property adapting to the extremely cold region and the preparation process thereof, austenite grains are fully crushed in the rough rolling stage, the accumulated reduction rate is guaranteed in the finish rolling stage, the austenite deformation recovery time is fully guaranteed, cooling acceleration and grain superposition refinement are assisted, the low-temperature toughness of a steel