Steel plate for polar ocean engineering and preparation method of steel plate

Abstract

The invention discloses a steel plate for polar ocean engineering and a preparation method of the steel plate. The steel plate is prepared from the components in percentage by mass: 0.06%-0.09% of C,0.20%-0.35% of Si, 1.48%-1.63% of Mn, 0.020%-0.035% of Nb, 0.010%-0.020% of Ti, 0.020%-0.035% of V, 0.08%-0.17% of Ni, 0.015%-0.040% of Als, less than or equal to 0.013% of P and less than or equal to0.005% of S. The preparation method of the steel plate comprises the steps: primarily smelting, refining and casting are conducted, a casting blank is obtained, and then slow cooling is conducted; the slowly-cooled casting blank is heated and then rolled, and the steel plate is obtained; and the steel plate is cooled. The type of steel has excellent comprehensive properties such as high strength,low temperature resistance, easy welding, corrosion resistance and the like, and is good in low-temperature aging impact toughness.

Description

technical field [0001] The invention belongs to the technical field of steel plate production for polar regions, and in particular relates to a steel plate for polar marine engineering and a preparation method thereof. Background technique [0002] With the increasing shortage of energy in the world, in the last century, developed countries such as Europe and the United States increased the development of marine resources, built a large number of offshore platforms in the Gulf of Mexico and Northern Europe, and also promoted the development of steel for marine engineering. Offshore platforms are used in severe marine working environments such as waves, sea tides, storms and extremely cold drift ice, and support drilling equipment with a total weight of more than hundreds of tons. These usage characteristics determine that steel for offshore platforms must have performance indicators such as high strength, high toughness, low temperature resistance, fatigue resistance, lamell...

AI Technical Summary

Problems solved by technology

[0003] Although there are many patents on high-strength toughness and low-temperature-resistant marine steel plates, there are generally disadvantages such as high alloy content, complicated process flow, and insufficient low-temperature toughness. The following briefly introduces several similar patents:

[0004] Chinese patent application CN 102851611 B discloses "ultra-high-strength toughness steel plate for deep-water pressure-resistant shell and its manufacturing method". The contents of Cu, Ti, Als, V, N, and Ca elements are all required. The types and contents of alloying elements far exceed the contents in this application, which will inevitably increase its cost, and it is difficult to precisely control the composition in the steelmaking process

The production process of the steel plate is TMCP+QT, the production process is complicated and the production cost is high

[0005] Chinese patent application CN 103060715 B discloses "a kind of ultra-high toughness steel plate with low yield ratio and its manufacturing method". , Nb, Ti, Al, V, N, O, Ca, and B elements are all required. The type and content of alloying elements far exceed the content of this application, which will inevitably increase its cost, and its steelmaking process It is difficult to precisely control the composition; the production process of the steel plate is hot rolling + quenching + low temperature tempering, the process flow is complicated and the production cost is high; service requirements in the environment

[0006] Chinese patent application CN 108728743 B discloses "steel for marine engineering with good low-temperature fracture toughness and its manufacturing method". The steel plate production process involved in this patent is hot rolling + double quenching + low-temperature tempering. High, not conducive to mass industrial production with high efficiency and low cost, and low temperature aging impact toughness is insufficient

[0007] Chinese patent application CN 104674117 A discloses "a 420MPa steel plate for ocean engineering and its manufacturing method". The content of Cu elements is required, and the Cu added in this patent will cause copper embrittlement, which will lead to intergranular cracking in the hot rolling process. In addition, the content of other alloy elements in this application is not higher than that of this patent; although The steel plate involved in this patent has good strong plasticity, but the low temperature impact toughness is lower than this application, and there is no mention of aging impact performance

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