Corrosion-resistant and biological-adhesion-resistant EH690 steel plate and manufacturing method thereof

Abstract

The invention discloses a corrosion-resistant and biological-adhesion-resistant EH690 steel plate and a manufacturing method thereof. The steel comprises 0.09%-0.12% of C, 0.15%-0.35% of Si, 1.0%-1.5%of Mn, 0.02%-0.03% of P, less than or equal to 0.01% of S, 0.01%-0.03% of Als, 1.5%-3.0% of Ni, 0.3%-0.6% of Cr, 0.3%-0.5% of Mo, 0.5%-1.5% of Cu, 0.03%-0.06% of V, 0.005%-0.02% of Ti, 0.0005%-0.001%of B, 0.005%-0.3% of Sb, 0.005%-0.3% of Sn and the balance iron and inevitable impurities. The initial rolling temperature of the first stage is 1000-1050 DEG C, the initial rolling temperature of the second stage is 900-1000 DEG C, the cumulative reduction rate of the second stage rolling is 40%-60%, and the final rolling temperature is 900-950 DEG C; and the quenching temperature is 830-870 DEGC, the heat preservation time is 1.0-2.0 min / mm, the tempering temperature is 600-630 DEG C, the heat preservation time is 2-3 min / mm, and the cooling rate after tempering is 5-15 DEG C / s. The steelplate has excellent marine environment corrosion resistance.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, and in particular relates to a component design and a manufacturing method of an EH690 ultra-high-strength marine steel plate resistant to marine environment corrosion and bio-adhesion. Background technique [0002] The 21st century is the century of the ocean. With the development of science and technology and the improvement of people's living standards, all countries in the world are focusing their attention on the huge resources contained in the ocean. In recent years, the continuous and rapid development of the offshore engineering equipment industry has also promoted a large demand for steel for offshore engineering platforms and product upgrading. The market urgently needs ultra-high-strength and extra-thick marine engineering steel plates with good comprehensive properties. [0003] The service environment of offshore engineering platforms is harsh. In addition to conven...

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Problems solved by technology

[0006] Publication No. CN106756602A patent "A high-strength weather-resistant steel resistant to high humidity and heat ocean atmosphere" proposes a corrosion-resistant steel plate with a yield strength of 700 MPa, which contains 0.01% to 0.03% of C and 0.3% to 0.5% of Mn, which cannot produce high Strength and thickness of steel plate, the patent does not propose a suitable production process

[0007] Patent No. CN103741056A "A Corrosion-Resistant Steel Plate for Marine Environment Resistant to the South China Sea and Its Production Process" proposes a corrosion-resistant steel plate for marine environment, whose yield strength and steel plate thickness cannot meet the needs of key structures of offshore engineering platforms

[0008] Publication No. CN104419871A patent "Steel for welded structure with excellent corrosion resistance in marine environment and its manufacturing method" proposes a steel plate for TMCP welded structure with a yield strength of 235-550 MPa, and its alloy composition and production process cannot produce Ultra-high-strength marine steel plate with large thickness, seawater corrosion resistance and bio-fouling resistance

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