A kind of weathering steel resistant to high temperature, high humidity and high salt spray marine atmospheric environment and its preparation method

Abstract

The invention discloses weather-resistant steel resistant to a high-temperature, high-humidity and high-salt-mist marine atmospheric environment and a preparation method, and belongs to the technicalfield of weather-resistant steel. The steel comprises the following chemical components of, in percentage by weight, 0.03-0.07 of C, 0.35-0.55 of Si, 1.15-1.35 of Mn, less than or equal to 0.01 of P,less than or equal to 0.025 of S, 0.25-0.45 of Cu, 2.5-3.5 of Cr, 0.9-1.1 of Ni, 0.05-0.15 of Mo, 0-0.6 of Sn and the balance Fe. According to the method, a steel ingot conforming to a component design range is smelted through a vacuum induction furnace, then the subsequent rolling controlling and cooling controlling process is performed, and finally the weather-resistant steel with the bainite structure is finally obtained. The weather-resistant steel has excellent comprehensive performance; and on the basis that the content of Cr is increased and the content of high-cost Ni is reduced, microalloy elements such as Mo and Sn are added, requirements of the harsh service environment of high temperature, high humidity and high salt mist in South China Sea for high weatherability can be met, and requirements for the stable mechanical property of the steel can also be met.

Description

technical field [0001] The invention belongs to the technical field of weathering steel, and in particular relates to a weathering steel resistant to high temperature, high humidity, and high salt spray marine atmospheric environment and a preparation method thereof. Background technique [0002] For a long time, since the design and manufacture of low-alloy structural steel in my country has been developing in the main direction of multi-variety, high strength and toughness, complex load, and easy welding, corrosion resistance has not been regarded as one of the design criteria for structural steel. Even weathering steels are completely based on the continental climate environment. Therefore, conventional low-alloy structural steels or weathering steels fail due to severe corrosion in a short period of time in the tropical and subtropical environments of the South China Sea. Service requirements. In particular, the facilities and equipment of South China Sea islands and re...

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Problems solved by technology

However, for the harsh service environment of the South China Sea environment, my country currently does not have a complete research foundation and technical level, and there is an urgent need to establish a weathering steel with a new alloy system so that it has high corrosion resistance in high temperature, high humidity, and high salt spray environments. sex

[0004] At present, in the harsh marine and atmospheric environment, only the weather resistance of 3Ni steel has been widely recognized. However, because Ni is a rare metal, the mineral resources are not rich, and the recovery rate in steel is extremely low, resulting in high cost of 3Ni steel and limited application. Therefore, it is imperative to independently develop economical weathering steel suitable for high-temperature, high-humidity, and high-salt fog marine atmospheric environments in the South China Sea

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