Molten steel of atmosphere-corrosion-resistant structural steel, atmosphere-corrosion-resistant structural steel containing chromium and titanium and production method of atmosphere-corrosion-resistant structural steel

Abstract

The invention relates to the field of steelmaking and particularly provides molten steel of an atmosphere-corrosion-resistant structural steel. The total weight of the molten steel serves as the datum, and 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, 0.06%-0.12% of V, 0.005%-0.030% of Ti, 0.004%-0.008% of N, not greater than 0.030% of P and not greater than 0.020% of S. The invention provides the atmosphere-corrosion-resistant structural steel and a production method thereof. By means of continuous casting of the molten steel, center quality of a casting blank can be improved, center cracks and center shrinkage cavities are avoided, therefore quality of the casting blank of the structural steel high in strength and atmosphere-corrosion resistance can be improved, and the qualification rate of the casting blank can be remarkably increased; and in addition, the atmosphere-corrosion-resistant structural steel which is finally obtained is good in atmosphere-corrosion resistance and higher in 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...

AI Technical Summary

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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