High-strength atmospheric corrosion-resistant medium plate and manufacturing method thereof

Abstract

The invention relates to a high-strength atmospheric corrosion-resistant medium plate and a manufacturing method thereof. The medium plate comprises the following chemical components in percentage by mass: more than 0 and less than or equal to 0.12 percent of C, more than or equal to 0.15 percent and less than or equal to 0.45 percent of Si, more than or equal to 0.70 percent and less than or equal to 1.40 percent of Mn, more than 0 and less than or equal to 0.020 percent of P, more than 0 and less than or equal to 0.008 percent of S, more than or equal to 0.35 percent and less than or equal to 1.00 percent of Cr, more than or equal to 0.15 percent and less than or equal to 0.55 percent of Ni, more than or equal to 0.25 percent and less than or equal to 0.50 percent of Cu, more than 0 and less than or equal to 0.22 percent of Nb and V and Ti and the balance of Fe and inevitable impurities. The manufacturing method of the medium plate comprises the steps of: A, preparing continuously cast blank through the preprocessing and desulfuration of molten iron, the smelting in a top-bottom blowing converter, LF refining and the continuous casting of a thick plate blank; and B, machining the continuously cast blank to make the medium plate by adopting a TMCP process with a finishing temperature of 790 and 890 DEG C, quickly cooling the medium plate with water to 550 to 650 DEG C for reeling, and then cooling the medium plate to room temperature. The medium plate machined by using the manufacturing method of the atmospheric corrosion-resistant high-strength medium plate has low harmful element content and level of banded structures, high comprehensive mechanical property, atmospheric corrosion resistant performance and excellent formability.

Description

technical field [0001] The invention relates to a high-strength atmospheric corrosion-resistant medium-thick plate and a manufacturing method thereof. Background technique [0002] Atmospheric corrosion-resistant steel is mainly used to manufacture structural parts that require atmospheric corrosion resistance, such as containers, railway vehicles, corrosion-resistant parts of power plant boilers, oil derricks, and construction machinery. Among them, the railway industry is one of the most important application fields of atmospheric corrosion-resistant steel. The development trend of railway vehicles is high speed and heavy load. Improving the strength of steel to reduce the weight of vehicles is an important means to achieve this goal. Stamping and bending are the most important forming methods of atmospheric corrosion-resistant steel for railway vehicles. Therefore, in addition to requiring high strength In addition, it is also required that the atmospheric corrosion-resis...

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Problems solved by technology

Atmospheric corrosion-resistant steel for existing railway vehicles has increased strength, but there are stamping or bending cracks, which seriously affects the stable production and safe operation of railway vehicles

[0003] On August 6, 2008, the invention patent of "a kind of ultra-low carbon hot-rolled weathering steel with a yield strength greater than 450MPa" with the publication number CN101235470A provided a A high-strength atmospheric corrosion-resistant steel, but the steel contains 0.30-0.48% of the precious alloying element Mo, which increases the cost of steel

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