720MPa-grade large-thickness ship steel plate and manufacturing method thereof

Abstract

The invention discloses a 720MPa-grade large-thickness ship steel plate. The 720MPa-grade large-thickness ship steel plate is manufactured from the following chemical components in percentage by mass: 0.055% to 0.09% of C, 0.05% to 0.14% of Si, 1.65% to 1.95% of Mn, less than or equal to 0.002% of S, less than or equal to 0.008% of P, 0.02% to 0.05% of Als, 0.003% to 0.010% of N, 0.70% to 0.95% of Ni, 0.70% to 1.00% of Cr, 0.02% to 0.04% of Nb, 0.15% to 0.30% of Cu, 0.008% to 0.015% of Ti, and the balance of Fe and inevitable impurities. The technical requirements of severe and harsh ocean environments on a marine steel plate can be met.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, and in particular relates to a steel plate for a ship with a yield strength of 720 MPa, low temperature resistance, ultra-high strength and thickness, and a manufacturing method thereof. Background technique [0002] Driven by the rapid growth of the shipbuilding industry in recent years, the demand for ultra-low ship steel is increasing rapidly year by year. However, my country lacks polar ship design and manufacturing experience, and there is a big gap compared with polar shipbuilding powerhouses such as Finland, Japan, South Korea, the United States and Russia. In 2016, GSI undertook the construction of polar condensate tankers in the Russian Yamal project. In 2017, my country's largest offshore engineering company, CIMC Raffles, undertook the construction of the "Viking Dragon" Arctic drilling platform ordered by Norway. Although Chinese shipbuilding companies have underta...

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Problems solved by technology

However, my country lacks polar ship design and manufacturing experience, and there is a big gap compared with polar ship building powerhouses such as Finland, Japan, South Korea, the United States and Russia.

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