700MPa-grade cold rolled steel plate with high weather resistance and preparation method thereof

Abstract

The invention discloses 700MPa-grade cold rolled steel plate with high weather resistance and a preparation method thereof. In the invention, a thin plate black continuous casting and continuous rolling flow is adopted. The refined molten steel mainly comprises the following chemical components: 0.03 to 0.07 weight percent of C, less than or equal to 0.35 weight percent of Si, 0.4 to 1.8 weight percent of Mn, less than or equal to 0.020 weight percent of P, less than or equal to 0.010 weight percent of S, 0.25 to 0.50 weight percent of Cu, 0.25 to 0.80 weight percent of Cr, 0.05 to 0.30 weight percent of Ni, 0.06 to 0.20 weight percent of Ti, and the balance of Fe and inevitable impurities. In an annealing process, steel is annealed in a cover annealing furnace at the temperature of 500 DEG C to an A1 transition point. The yield strength of the cold rolled steel plate with high weather resistance exceeds 700MPa, and the elongation rate is over 5 percent, and the cold rolled steel plate has high machinability and high weather resistance.

Description

technical field [0001] The invention relates to a 700MPa grade cold-rolled steel plate with excellent weather resistance and a preparation method thereof. Background technique [0002] In recent years, in order to reduce costs and solve environmental problems, the peripheral structural components of containers or vehicles need to use thinner, higher-strength steel plates, and such ultra-thin, high-strength steel is difficult to achieve at the current level of hot-rolling technology and equipment , Therefore, it can only be prepared and produced by cold rolling, annealing and other reprocessing processes. High-strength cold-rolled steel plate with excellent weather resistance can significantly reduce the thickness of the steel plate while ensuring sufficient structural stability. At the same time, because the container should be subjected to various climatic conditions on land or sea, according to the transportation conditions, the container mainly Manufactured using steel w...

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Problems solved by technology

Similarly, this technology uses hot-rolled plates produced in the traditional process and then undergoes cold rolling and continuous annealing processes. The process is complicated and the energy consumption is high; at the same time, a large amount of precious metals such as Nb, Ti, and Mo are added to the patent as reinforcing components. , the cost of the alloy is high, and the process control is complicated; a

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