Weather-proof steel plate and manufacturing method thereof

Abstract

The invention discloses a weather-proof steel plate and a manufacturing method thereof. The weather-proof steel plate comprises, by mass percentage, 0.04-0.10% of C, 0.18-0.35% of Si, 1.00-1.60% of Mn, 0.008-0.015% of P, 0.25-0.45% of Cu, 0.40-0.60% of Cr, 0.30-0.50% of Ni, 0.02-0.05% of Alt, 0.01-0.05% of Nb, and the balance Fe and unavoidable impurities. Through the reasonable composition proportion, the steel plate can obtain excellent welding performance under the condition of the low P content, meanwhile has ultrahigh strength, high toughness and high weather resistance, and well meets the requirement of application to a monorail turnout. According to the manufacturing method of the weather-proof steel plate, through the two-stage rolling process, austenite grain structures are refined repeatedly, the strength of the steel plate is improved, quenching and tempering are not needed during production, production cost is reduced, and the production period is shortened.

Description

technical field [0001] The invention relates to an alloy steel plate, in particular to a weather-resistant steel plate for a single track switch and a manufacturing method thereof. Background technique [0002] A monorail is a type of railway that uses only one track. Similar to urban rail transit systems, monorails are mainly used in densely populated cities to carry passengers. Monorail is usually elevated, which has the advantages of low cost, less pollution and short construction period, and monorail occupies less land and can effectively use the central isolation zone of the road, which is an effective way to improve urban traffic. [0003] However, most of the existing weather-resistant steel plates used for manufacturing single track switches improve their corrosion resistance by increasing the P content in the steel plates, ignoring the toughness, plasticity and welding performance of the steel plates. Moreover, the content of Cu, Cr, and Ni is relatively small, th...

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Problems solved by technology

[0003] However, most of the existing weather-resistant steel plates used to manufacture single track switches improve their corrosion resistance by increasing the P content in the steel plate, ignoring the toughness, plasticity and welding performance of the steel plate

Moreover, the content of Cu, Cr, and Ni is relatively small, the weather resistance is insufficient, and the manufacturing process is relatively complicated, which cannot take into account both performance and production cost

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