High-damp-heat-resistant marine atmosphere high-strength weathering resistant steel

Abstract

The invention provides high-damp-heat-resistant marine atmosphere high-strength weathering-resistant steel and belongs to the technical field of weathering-resistant steel. The weathering resistant steel comprises chemical ingredients of, in percentage by weight, 0.01-0.03 wt% of C, 0.30-0.50 wt% of Si, less than or equal to 0.01 wt% of P, less than or equal to 0.007 wt% of S, 0.30-0.50 wt% of Mn, 0.80-1.00 wt% of Cu, 2.90-3.10 wt% of Ni, 0.10-0.30 wt% of Mo, 0.20-0.30 wt% of Sn, 0.05-0.10 wt% of Sb, 0.40-0.60 wt% of Cr, less than or equal to 0.02 wt% of Nb, 0.01-0.03% of RE and the balance Fe and other inevitable impurity elements. Ultra-low carbon is adopted for ingredient design, the Sn, Sb and RE corrosion-inhibition alloy elements are added on the basis of a Cu-Ni-Cr-Mo alloy system in a compounded manner, and a great number of thin and small needle-shaped ferrite tissues are obtained supplemented by the microalloyed element Nb. The high-damp-heat-resistant marine atmosphere high-strength weathering resistant steel has the advantages that the steel has excellent weathering resistance and is particularly resistant to the high-damp-heat-resistant marine atmosphere environment, and corrosion resistance of the steel is increased by about three times that of plain carbon steel Q345 and is increased by about two times that of traditional weathering resistant steel Q450NQR1; and meanwhile, the steel has strength of 700 MPa level, the yield strength ratio is less than or equal to 0.80, and the extension rate is larger than or equal to 15%.

Description

technical field [0001] The invention belongs to the technical field of weather-resistant steel, and in particular relates to a high-strength weather-resistant steel resistant to high humidity and heat. Marine Atmospheric Environmental Performance. Background technique [0002] Weathering steel has a history of more than 80 years from its birth to the present. The original weathering steel only added Cu elements to plain carbon steel. American scholar Buck published the results of the exposure test on the atmosphere in 1913, clarifying that the atmosphere contains Cu. Corrosion resistance of steel. Inspired by the initial report of the United States, Germany matched test steels with different Cu and P contents to carry out exposure tests in rural atmosphere, industrial atmosphere and North Sea coastal atmosphere. The results show that the coexistence of Cu and P in industrial areas has obvious effects. In 1928, the Corrosion Committee of the British Iron and Steel Associati...

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Problems solved by technology

Under some severe corrosive environmental conditions, such as the climate environment of three highs and one strong "high temperature, high humidity, high salt spray, and strong sunshine" in the South China Sea, due to Cl - The strong penetration of the corrosion product causes the destruction of the corrosion product film. The above-mentioned improved weathering steel based on Corten steel will all experience accelerated corrosion, the surface cannot form a stable rust layer, corrosion products will peel off, and the steel surface will become thinner.

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