Molten steel containing niobium nitrogen resistant atmospheric corrosion section steel and atmospheric corrosion resistant section steel and production method thereof

Abstract

The invention relates to the field of steelmaking and particularly provides atmosphere corrosion resisting profile steel liquid. On the criterion of the total weight of the steel liquid, the steel liquid 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, 2.0-3.5% of Cr, 0.16-0.20% of V, 0.005-0.030% of Ti, 0.01-0.015% of Nb, 0.021-0.030% of N, no more than 0.030% of P and no more than 0.020% of S. The invention provides atmosphere corrosion resisting profile steel and a production method thereof. When the steel liquid is adopted for continuous casting, the center quality of cast blanks can be improved, center cracking and center line shrinkage are avoided, and thus the quality of profile steel cast blanks with high strength and high atmosphere corrosion resistance can be improved, and the qualification rate of cast blanks can be greatly increased. In addition, the finally obtained atmosphere corrosion resisting profile steel has good atmosphere corrosion resistance and higher strength.

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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