High-strength hardened and tempered steel plate for ocean engineering and production method thereof

Abstract

The invention discloses a high-strength hardened and tempered steel plate for ocean engineering and a production method thereof. The steel plate comprises the components of 0.10%-0.15% of C, 0.15%-0.40% of Si, 1.10%-1.35% of Mn, 0-0.010% of P, 0-0.005% of S, 0.15%-0.45% of Cr, 0.10%-0.30% of Ni, 0.015%-0.028% of Nb, 0.015%-0.042% of V, 0.025%-0.045 % of Al, and the balance Fe and inevitable impurities. The production method comprises the procedures of converter steelmaking, LF refining, VD vacuum treatment, continuous casting, casting blank heating, rolling and hardened-tempered heat treatment. The steel plate is 20-50 mm in thickness, larger than or equal to 480 MPa in yield strength, 620-780 MPa in tensile strength, larger than or equal to 20% in elongation and larger than or equal to 100 J in -40 DEG C longitudinal impact work and has good comprehensive performance.

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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