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Atmospheric corrosion resistant type liquid steel and niobium-nitrogen contained atmospheric corrosion resistant type steel and manufacturing method thereof

A technology of atmospheric corrosion resistance and production method, applied in the field of atmospheric corrosion resistant section steel, can solve problems such as the failure of the section steel strength index to achieve the effect of improving quality, improving center quality, and avoiding center cracks

Active Publication Date: 2017-05-17
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Atmospheric corrosion resistant type liquid steel and niobium-nitrogen contained atmospheric corrosion resistant type steel and manufacturing method thereof
  • Atmospheric corrosion resistant type liquid steel and niobium-nitrogen contained atmospheric corrosion resistant type steel and manufacturing method thereof
  • Atmospheric corrosion resistant type liquid steel and niobium-nitrogen contained atmospheric corrosion resistant type steel and manufacturing method thereof

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0026] As mentioned above, the present invention provides a kind of atmospheric corrosion-resistant molten steel, based on the total weight of molten steel, molten steel contains: 0.01%-0.09% of C, 0.15%-0.35% of Si, 0.30%-0.60% of Mn, 0.30%-0.40% Cu, 0.20%-0.30% Ni, 3.5%-5.0% Cr, 0.16%-0.20% V, 0.005%-0.030% Ti, 0.01%-0.015% Nb, 0.021%-0.030% N, not more than 0.030% P and not more than 0.020% S. The central quality of the slab (also called continuous casting slab) obtained by continuous casting of molten steel with the aforementioned composition is improved, and the center of the cross section of the continuous casting slab (after acid etching) basically has no central cracks and holes.

[0027] Accordin...

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Abstract

The invention relates to the field of steel making, in particular to atmospheric corrosion resistant type liquid steel. On the basis of the total weight of the liquid steel, the liquid 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, 0.16%-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 atmospheric corrosion resistant type steel and a manufacturing method thereof. By adopting continuous casting of the liquid steel, the center quality of a casting blank can be improved, and center cracks and center shrinkage cavities are avoided, so that the quality of the high strength and high atmospheric corrosion resistant type steel casting blank can be improved, and the qualification rate of the casting blanks can be increased greatly; and finally, the obtained atmospheric corrosion resistant type steel has good atmospheric corrosion resistant capacity 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50
Inventor 刘明邓通武郭跃华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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