Atmosphere corrosion resisting molten profile steel, atmosphere corrosion resisting vanadium-titanium-nitrogen-containing profile steel and production method of atmosphere corrosion resisting vanadium-titanium-nitrogen-containing profile steel

Abstract

The invention relates to the field of steelmaking and particularly provides atmosphere corrosion resisting molten profile steel. Based on the total weight, the molten profile steel contains 0.01% to 0.09% of C, 0.15% to 0.35% of Si, 0.30% to 0.60% of Mn, 0.30% to 0.40% of Cu, 0.20% to 0.30% of Ni, 3.5% to 5% of Cr, 0.16% to 0.20% of V, 0.005% to 0.030% of Ti, 0.004% to 0.008% of N, not larger than 0.030% of P and not larger than 0.020% of S. The invention provides atmosphere corrosion resisting profile steel and a production method thereof. By adopting the molten profile steel provided by the invention for continuous casting, the center quality of an ingot can be improved, and generation of center cracks and center line shrinkage can be avoided, so the quality of high-strength high-atmosphere-corrosion-resistance type profile steel ingot can be improved, the percent of pass of the ingot can be greatly increased, and moreover the finally-obtained atmosphere corrosion resisting profile steel is good in atmosphere corrosion resistance and higher in strength property.

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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