Molten steel of atmospheric corrosion resistant steel and chromium-nitrogen containing atmospheric corrosion resistant steel and production method thereof

Abstract

The invention relates to the field of steel making, and specifically provides molten steel of atmospheric corrosion resistant steel. Based on total weight of the molten steel, the molten steel comprises the following components in percentage by weight: 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, 0.13%-0.15% of V, 0.004%-0.008% of N, not greater than 0.030% of P and not greater than 0.020% of S. The invention provides atmospheric corrosion resistant steel and a production method thereof. The molten steel can be continuously cast to improve central quality of casting blank, and central cracks and central pore shrinkage are avoided, so that quality of high-strength atmospheric corrosion resistant steel casting blank can be improved, and the qualification rate of casting blank can be greatly increased; and moreover, the finally obtained atmospheric corrosion resistant steel is good in atmospheric corrosion resistance, and has 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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