Hot-rolled strip steel with tensile strength larger than or equal to 1500 MPa produced through TSR production line and method

• Main Authors: GE RUI, FENG ZONGJIN, TONG YOUGEN, GE ZHENRONG, CHAI ZHENHUA
• Format: Patent
• Language: Chinese; English
• Published: 02.09.2022
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; 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; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The hot-rolled strip steel with the tensile strength larger than or equal to 1500 MPa produced through a TSR production line comprises, by weight, one or more than two of 0.20%-0.25% of C, 0.25%-0.50% of Si, 1.30%-2.00% of Mn, smaller than or equal to 0.01% of P, smaller than or equal to 0.01% of S, 0.015%-0.050% of Als, 0.4%-1.0% of Cr, smaller than or equal to 0.005% of N and 0.016%-0.035% of Nb or 0.016%-0.035% of Ti or 0.06%-0.20% of V. The process comprises the steps of conventional smelting and refining; casting to form a blank; hot rolling; cooling is performed; after coiling, naturally cooling; and carrying out cold forming after uncoiling and blanking. By adding Nb or Ti or V or compounding, controlling Cr and Mo and adopting the TSR process, the mechanical property can be guaranteed, repeated heating, multiple dephosphorization, multi-pass rolling and the like of the strip steel can be reduced, cold rolling and annealing can be omitted, energy consumption is reduced by 80% or above, carbon dioxide e