A kind of production method of high-quality thick-gauge steel plate

Abstract

The invention belongs to the technical field of steel materials, and discloses a production method of a high-quality thick steel plate. The production method comprises the steps that the procedure ofhigh-temperature rolling and the procedure of low-temperature rolling are conducted in a non-recrystallization area in the rolling process, wherein the procedure of high-temperature rolling comprise afirst finish rolling stage, and in the first finish rolling state, a low-speed high-pressure rolling process is adopted, the initial rolling temperature is 900-930 DEG C, a required cumulative rolling rate is equal to or greater than 15%, and the maximum single-pass rolling rate is equal to or greater than 12%; the procedure of low-temperature rolling comprises a second finish rolling stage, andin the second finish rolling stage, a low-temperature high-pressure rolling process is adopted, the initial rolling temperature of a steel plate is 780-820 DEG C, and the finish rolling temperature is760-780 DEG C; and steel is discharged after being rolled and then rapidly enters water to be cooled. By adoption of the production method of the high-quality thick steel plate, the performance of the high-strength and high-tenacity thick steel plate produced through a continuously cast plate is improved, and meanwhile, the technical problems of slow rolling rhythm and low efficiency are solved.

Description

technical field

[0001] The invention relates to the technical field of iron and steel materials, in particular to a production method of high-quality thick-gauge steel plates. Background technique

[0002] With the advancement of steel production technology, the steel plate delivered in TMCP state has gradually replaced the steel plate delivered in normalizing state due to its better weldability and comprehensive performance. For large-thickness steel plates, the strength and toughness matching of the core of TMCP and the uniformity of performance in the entire thickness direction have become difficulties in its production process. The traditional process is aimed at emphasizing the refinement of austenite grains by rolling the steel plate in the recrystallization zone, rolling in the non-recrystallization zone with an appropriate temperature control thickness, and supplemented by an appropriate water cooling process to ensure the performance of the steel plate. However, wi...

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