Vanadium-titanium-nitrogen-containing atmospheric-corrosion-resistant molten steel, atmospheric-corrosion-resistant steel and production method of atmospheric-corrosion-resistant steel

Abstract

The invention relates to the steel making field, and particularly provides atmospheric-corrosion-resistant molten steel. Based on the total weight of the molten steel, 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, 2.0-3.5% of Cr, 0.16-0.20% of V, 0.005-0.030% of Ti, 0.004-0.008% of N, less than or equal to 0.030% of P and less than or equal to 0.020% of S. The invention also provides atmospheric-corrosion-resistant steel and a production method thereof. When the molten steel is adopted for continuous casting, the center quality of casting blanks can be improved, center cracks and center line shrinkage are prevented, accordingly, the quality of the high strength and high atmospheric corrosion resistance steel casting blanks can be improved, and the qualification rate of the casting blanks can be improved to a great extent; and the finally obtained atmospheric-corrosion-resistant steel has good atmospheric corrosion resistance 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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