720mpa class large thickness ship steel plate and its manufacturing method

Abstract

The invention discloses a 720MPa grade large thickness ship steel plate, C: 0.055%-0.09%; Si: 0.05%-0.14%; Mn: 1.65%-1.95%; S: ≤ 0.002%; P: ≤ 0.008%; Als : 0.02% to 0.05%; N: 0.003% to 0.010%; Ni: 0.70% to 0.95%; Cr: 0.70% to 1.00%; Nb: 0.02% to 0.04%; Cu: 0.15% to 0.30%; Ti: 0.008 %~0.015%; the balance is Fe and inevitable impurities. It can meet the technical requirements of marine steel plates in harsh and harsh environments.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, and particularly relates to a steel plate for ships 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 very low-quality ship steel has been rising rapidly year by year. However, my country lacks polar ship design and manufacturing experience, and there is a big gap compared with Finland, Japan, South Korea, the United States and Russia and other polar ship building powerhouses. In 2016, Guangzhou Shipbuilding International undertook the construction of the polar condensate tanker in the Yamal project in Russia. In 2017, CIMC Raffles, my country's largest offshore engineering company, undertook the construction of the "Viking Dragon" Arctic drilling platform ordered by Norway. Alth...

AI Technical Summary

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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