High-thickness steel plate for ocean platform and production method for steel plate

Abstract

The invention discloses a high-thickness steel plate for an ocean platform. The steel plate comprises the following chemical components in percentage by mass: 0.14 to 0.18 percent of C, 0.30 to 0.40 percent of Si, 1.2 to 1.4 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.020 to 0.045 percent of Al, 0.02 to 0.05 percent of Nb, 0.05 to 0.1 percent of V, and the balance of Fe and inevitable impurities. The high-thickness steel plate for the ocean platform is reasonable in chemical component design and low in production cost. The steel plate is prepared by adopting an electroslag remelting process and a normalizing heat treatment process, and the thickness of the prepared steel plate reaches 300 millimeters. The finished steel plate has the advantages of high yielding strength, excellent Z-directional performance, high negative temperature impact power, high elongation and high low-temperature impact toughness resistance and lamellar tearing resistance.

Description

technical field [0001] The invention belongs to the technical field of steel smelting, and in particular relates to a large-thickness steel plate for offshore platforms and a production method thereof. Background technique [0002] In recent years, with the gradual development of offshore oil and natural gas, offshore platform engineering has developed rapidly, and the market demand for steel plates for offshore platforms is also increasing. Steel plates for offshore platforms not only require large thickness specifications, but also have strict requirements on low-temperature impact toughness and lamellar tear resistance due to the special use environment of steel plates for offshore platforms. [0003] The currently used steel plates for offshore platforms with large thickness specifications and large single weights have a thickness of more than 150 mm, and steel plates for offshore platforms with a single weight greater than 30 tons have poor mechanical properties such a...

AI Technical Summary

Problems solved by technology

[0003] The currently used steel plates for offshore platforms with large thickness specifications and large single weights have a thickness of more than 150 mm, and steel plates for offshore platforms with a single weight greater than 30 tons have poor mechanical properties such as negative temperature impact energy, especially poor Z-direction performance. Moreover, since the existing steel plates for offshore platforms contain more precious metals, the production cost is higher

The current steel plates for offshore platforms cannot meet the needs of the market