Atmospheric corrosion-resistant steel molten steel and chromium-vanadium-nitrogen-containing atmospheric corrosion-resistant steel and production method thereof

Abstract

The invention relates to the field of steelmaking, and particularly provides atmosphere corrosion resistant section steel molten steel. Taking the total weight of the molten steel as a standard, the molten steel comprises 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, 3. 5%-5.0% of Cr, 0.16%-0.20% of V, 0.004%-0.008% of N, not larger than 0.030% of P and not larger than 0.020% of S. The invention provides atmosphere corrosion resistant section steel and a production method of the atmosphere corrosion resistant section steel. Through continuous casting of the molten steel in the invention, the center quality of a casting blank can be improved, center cracks and center line shrinkage can be avoided, and therefore the quality of the high-intensity high-atmosphere-corrosion-resistant section steel casting blank can be improved, and the yield of the casting blank can be greatly improved; and in addition, the finally-obtained atmosphere corrosion resistant section steel is good atmosphere corrosion resistance and has the high intensity 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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