Super-thick Q390GJC-Z35 steel plate for high-rise buildings and production method thereof

Abstract

The invention discloses a super-thick Q390GJC-Z35 steel plate for high-rise buildings and a production method thereof. The super-thick Q390GJC-Z35 steel plate comprises the following chemical compositions in percentage by mass: less than or equal to 0.19 percent of C, less than or equal to 0.50 percent of Si, 1.00 to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equalto 0.003 percent of S, less than or equal to 0.20 percent of microalloyed elements (Nb+V+Ti+Ni), less than or equal to 0.050 percent of Als and the balance of Fe and residual elements. By reasonably designing the chemical compositions of multiple composite microalloy elements, the cleanliness of steel is ensured by a low frequency (LF)+vacuum degassing (VD) process, the level of the sum of various inclusions does not exceed 3.0, the grain size of the steel reaches 9.0-10.0 level through control rolling and control cooling and normalizing treatment, and the super-thick steel plate for the high-rise buildings, which has the thickness of more than or equal to 100mm and ensures flaw detection and mechanicals properties, is produced successfully through the effective implementation of the measures.

Description

Technical field [0001] The invention relates to steel, in particular to a Q390GJC-Z35 steel plate for ultra-thick high-rise buildings and a production method thereof. Background technique [0002] With the rapid development of my country's national economy, the development of steel for high-rise buildings is also developing in the direction of extra thickness, extra width and high performance. The steel for high-rise buildings puts forward higher requirements on the strength and toughness of the steel plate, the yield ratio, and the ability to resist laminar tearing. At present, there are not many steel plants that can produce steel plates for high-rise buildings with a thickness of more than 100mm. Q390GJC-Z35 steel for high-rise buildings with a thickness of more than 100mm cannot be produced due to its difficult production and special requirements for process equipment. Summary of the invention [0003] In view of the above-mentioned problems, the present invention provides a ...

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Problems solved by technology

Q390GJC-Z35 steel for high-rise buildings with a thickness of more than 100mm cannot be produced due to the difficulty of production and special requirements for process equipment

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