High-performance steel plate resistant to corrosion of marine total immersion zone and production method of high-performance steel plate

Abstract

The invention discloses a high-performance steel plate resistant to corrosion of a marine total immersion zone and a production method of the high-performance steel plate. The steel plate comprises the following chemical components of, in percentage by weight, 0.065%-0.10% of C, 0.51%-0.80% of Si, 0.50%-1.00% of Mn, 0.02%-0.04% of P, S less than or equal to 0.005%, 0.045%-0.055% of Nb, 0.03%-0.05% of V, 0.01%-0.02% of Ti, 0.65%-0.75% of Cr, 0.40%-0.55% of Cu, 0.10%-0.20% of Sb, 0.020%-0.040% of RE, 0.02%-0.04% of Zr and 0.015%-0.045% of Als, the charging furnace temperature of a casting blank is 700-800 DEG C, the soaking temperature is 1130-1150 DEG C; the rough rolling starting temperature is 1100-1140 DEG C, the pass reduction rate is 15%-25%, the rough rolling speed is 1.2-1.5 m / s, the secondary rolling temperature is 840-860 DEG C, the finish rolling temperature is 800-840 DEG C, the initial cooling temperature is 760-780 DEG C, and the self-tempering temperature is 560-580 DEG C. The corrosion rate of the steel plate in the ocean total immersion area is smaller than 0.08 mm / a, the yield strength is 460-520 MPa, and the impact energy at the temperature of 60 DEG C below zero is larger than or equal to 200 J.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a high-performance steel plate for corrosion resistance in marine full immersion areas and a production method thereof. Background technique [0002] Corrosion is a common failure problem in the service process of steel materials. According to statistics, the economic loss caused by corrosion accounts for about 3% of the gross domestic product (GDP) every year. About 71% of the earth's surface area is rich in resources in the ocean. With the growing population of the world and the continuous consumption of land resources, the survival of human beings will become more and more dependent on the ocean in the future. The ocean will become the source of minerals, energy and food resources. main supply base. For this reason, marine development is listed as one of the key goals of future world development. Seawater contains a large amount of salts mainly NaCl, acco...

AI Technical Summary

Problems solved by technology

Solve the problems of serious biological corrosion, low strength, poor low temperature impact toughness and small steel plate thickness in the marine full immersion area

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