A high-strength quenched and tempered steel plate for marine engineering and its production method

Abstract

The invention discloses a high-strength quenched and tempered steel plate for marine engineering and a production method thereof. The composition of the steel plate is: C: 0.10-0.15%, Si: 0.15-0.40%, Mn: 1.10-1.35%, P≤0.010%, S≤0.005%, Cr: 0.15~0.45%, Ni: 0.10~0.30%, Nb: 0.015~0.028%, V: 0.015~0.042%, Al: 0.025~0.045%, the balance is Fe and unavoidable impurities; The production method includes converter steelmaking, LF refining, VD vacuum treatment, continuous casting, slab heating, rolling, quenching and tempering heat treatment processes. The steel plate of the invention has a thickness of 20-50mm, a yield strength of ≥480MPa, a tensile strength of 620-780MPa, an elongation of ≥20%, and a longitudinal impact energy of -40°C of ≥100J, and has good comprehensive properties.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength quenched and tempered steel plate for marine engineering and a production method thereof. Background technique [0002] With the continuous development of my country's marine development, especially in the context of the national development of marine strategies, the construction of marine engineering equipment represented by offshore drilling platforms, floating docks, and windmill installation ships has ushered in a new period of rapid development. Therefore, high-strength steel plates used in the manufacture of marine engineering equipment have also developed rapidly. However, some key materials still need to be imported, such as EQ series high-strength steel grades for marine engineering, and some high-strength quenched and tempered steels for marine engineering, such as Shanghai Zhenhua Heavy Industry, Dalian Shipbuilding, Yantai Raffles, China ...

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Problems solved by technology

However, some key materials still need to be imported, such as EQ series high-strength steel grades for marine engineering, and some high-strength quenched and tempered steels for marine engineering, such as Shanghai Zhenhua Heavy Industry, Dalian Shipbuilding, Yantai Raffles, China Merchants Heavy Industry and other offshore engineering manufacturers Hundreds of thousands of tons of high-strength steel are imported every year. Due to the long import cycle and high price, the development of my country's marine engineering special equipment manufacturing industry is seriously restricted.

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