Pre-welding preheating-free bridge steel produced through TMCP technology and preparation method of pre-welding preheating-free bridge steel

• Main Authors: ZHANG QINGLONG, WEI XIAN, XU BO, ZHAO LIANGSHENG, OU YANGYU, LI NA, CHENG GUANJIANG, SONG LIWEI, JI LIN, CHEN YINZE, HUANG ZHONG, SUN BIN
• Format: Patent
• Language: Chinese; English
• Published: 02.05.2023
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MACHINE TOOLS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; POWDER METALLURGY; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; PUNCHING METAL; ROLLING OF METAL; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WELDING; WORKING BY LASER BEAM

The invention discloses pre-weld preheating-free bridge steel produced through a TMCP technology and a preparation method of the pre-weld preheating-free bridge steel, and relates to the field of the pre-weld preheating-free bridge steel, and the pre-weld preheating-free bridge steel comprises the following chemical components of, by weight, 0.05%-0.09% of C, 0.12%-0.60% of Si, 1.50%-1.85% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 0.25%-0.50% of Cr, 0.015%-0.060% of Nb, 0.010%-0.060% of Al, 0.008%-0.035% of Ti, smaller than or equal to 0.005% of B, smaller than or equal to 0.0070% of N, smaller than or equal to 0.0030% of O, smaller than or equal to 0.0002 The technical key points are as follows: precious metals Mo, Ni and Cu are not added into the components of the steel, the effects of C, Mn, Cr and B elements are fully exerted, controlled rolling and three-stage controlled cooling processes are adopted, the 620MPa-grade bridge steel is obtained, the manufacturing pr