Steel plate with high strength and excellent low-temperature toughness and manufacturing method thereof

Abstract

The invention discloses a steel plate with high strength and excellent low-temperature toughness, and the steel plate comprises the following chemical elements in percentage by weight: more than or equal to 0.03% and less than or equal to 0.18% of C, more than or equal to 0.20% and less than or equal to 0.30% of Si, more than or equal to 0.50% and less than or equal to 1.10% of Mn, more than or equal to 0.010% and less than or equal to 0.030% of Ti, more than or equal to 0.02% and less than or equal to 1.15% of Cr, more than or equal to 0.01% and less than or equal to 0.80% of Mo, more than or equal to 0.05% and less than or equal to 1.40% of Ni, more than or equal to 0.010% and less than or equal to 0.040% of Nb, more than or equal to 0.0001% and less than or equal to 0.0650% of V, more than or equal to 0.025% and less than or equal to 0.050% of Al, more than or equal to 0.001% and less than or equal to 0.004% of Ca, more than or equal to 0.0001% and less than or equal to 0.0025% of B, and the balance of Fe and other inevitable impurities. The invention also discloses a manufacturing method of the steel plate with high strength and excellent low-temperature toughness, and the manufacturing method comprises the following steps of: (1) smelting; (2) refining outside a furnace; (3) continuously casting; (4) heating a plate blank; (5) rolling; and (6) carrying out heat treatment.

Description

technical field [0001] The invention relates to a steel plate and a manufacturing method thereof, in particular to a low-alloy quenched and tempered steel plate and a manufacturing method thereof. Background technique [0002] In recent years, the rapid development of the world economy has exacerbated the rapid consumption of global energy. The exploitation of oil, natural gas and other energy sources has gradually extended from land to offshore and deep sea. As a necessary device for offshore energy development, jack-up drilling platforms have developed accordingly. , At the same time, it also promotes the continuous progress of steel for offshore platforms. The steel for offshore platforms is developed on the basis of steel for hull structures, and the first offshore steel platforms were built with hull structural steels. With the advancement of science and technology and the vigorous development of marine development, the number and types of offshore platforms are increa...

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Problems solved by technology

In addition, the trend of large-scale development of offshore platforms is also gradually obvious. Usually, large-scale offshore platforms have complex structures, heavy welding workload, and high stress concentration.

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