High-strength weather-resisting hot rolled steel strip and manufacturing method thereof

Abstract

The invention relates to a high-strength weather-resisting hot rolled steel strip and a manufacturing method thereof. The hot rolled steel strip comprises the following chemical components in percentage by weight: C is more than 0 and is less than or equal to 0.10, Si is more than or equal to 0.15 and is less than or equal to 0.45, Mn is more than or equal to 0.70 and is less than or equal to 1.40, P is more than 0 and is less than or equal to 0.020, S is more than 0 and is less than or equal to 0.008, Cr is more than or equal to 0.35 and is less than or equal to 1.00, Ni is more than or equal to 0.15 and is less than or equal to 0.55, Cu is more than or equal to 0.25 and is less than or equal to 0.50, Nb+V+Ti is more than 0 and is less than or equal to 0.22, and the balance of Fe and other unavoidable impurities. The manufacturing method of the hot rolled steel strip comprises the following steps: A. continuous casting billet preparation is realized by hot metal pretreatment desulfuration, top and bottom combined blown converter smelting, LF refining and thick plate blank continuous casting; B. controlled rolling and controlled cooling technology are adopted to process the continuous casting billet into the hot rolled steel strip, finish rolling temperature is 790-890 DEG C, water cooling is quickly carried out to 450-650 DEG C for reeling, and then the obtained product is cooled to room temperature. The steel strip processed by the manufacturing method of the high-strength weather-resisting hot rolled steel strip has low hazardous element content and banded structure rank, higher comprehensive mechanical property, weather resisting performance and favourable formability.

Description

technical field [0001] The invention relates to a high-strength atmospheric corrosion-resistant hot-rolled steel strip and a manufacturing method thereof, specifically a 450MPa high-strength atmospheric-corrosion-resistant hot-rolled steel strip 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...

AI Technical Summary

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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