A kind of chromium-vanadium-containing atmospheric corrosion-resistant molten steel and atmospheric corrosion-resistant steel and production method thereof

Abstract

Relating to the steelmaking field, the invention especially provides an atmospheric corrosion resistant molten steel. Based on a total weight, the molten steel contains: 0.01%-0.09% of C, 0.15%-0.35%of Si, 0.30%-0.60% of Mn, 0.30%-0.40% of Cu, 0.20%-0.30% of Ni, 2.0%-3.5% of Cr, 0.06%-0.12% of V, 0.01%-0.015% of Nb, 0.004%-0.008% of N, and not more than 0.030% of P and not more than 0.020% of S.The invention provides an atmospheric corrosion resistant steel and a production method thereof. Continuous casting of the molten steel provided by the invention can improve the central quality of a casting blank, avoids central crack and central shrinkage cavity, thereby improving the quality of the high strength and high atmospheric corrosion resistant steel casting blank and greatly enhancing the casting blank qualification rate. Also, the finally obtained atmospheric corrosion resistant steel has good atmospheric corrosion resistant ability and higher strength performance.

Description

technical field [0001] The invention relates to an atmospheric corrosion-resistant steel molten steel, an atmospheric corrosion-resistant steel obtained by continuous casting and rolling using the molten steel of the invention, a production method of the atmospheric corrosion-resistant steel and the atmospheric corrosion-resistant steel obtained by the method. Background technique [0002] Atmospheric corrosion-resistant steel is a very important class of steel. Its atmospheric corrosion resistance is 2-8 times that of ordinary steel, and its paintability is improved by 1.5-10 times. Due to the effectiveness of atmospheric corrosion resistance steel compared with ordinary steel, and its good economic efficiency compared with stainless steel, it has been developed rapidly in various countries in the world. Various steel structures used in the open air, railway vehicles and bridges are is the scope of its application. [0003] The early atmospheric corrosion-resistant steel v...

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Problems solved by technology

However, as a profile steel, the square continuous casting slab produced after increasing the chromium content has relatively obvious central defects (mainly central cracks and central shrinkage cavities), and the strength index of the final profile steel cannot reach that of plate steel Therefore, profile steels with better atmospheric corrosion resistance are still under development.

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