Production method for producing ultra-thick high-strength building steel plate with excellent thickness direction performance on basis of single continuous casting billet rack

Abstract

The invention discloses a production method for producing an ultra-thick high-strength building steel plate with excellent thickness direction performance on the basis of a single continuous casting rack. The steel plate is simple in component design and mainly uses cheap Ti, Cu and a proper amount of Nb alloy as main strengthening alloy elements. In the production method, the addition ratio of Si, Mn to Cu in the steel plate and the content of harmful elements P, S and P+S are mainly controlled in a smelting process, so that the generation of the gas content, inclusions, shrinkage cavities and other defects in a casting blank is reduced; by controlling rolling, the coarse columnar crystal structure of the casting blank is crushed, crystal grains are refined, the fine and uniform structurein the thickness direction is ensured, and the strength is improved at the same time. Through controlling heat treatment, the structure defects are further eliminated, the structure is improved, thecomponents are homogenized, the crystal grains are refined to obtain good thickness direction performance, and meanwhile, it is ensured that the strength meets the requirements. The method has the advantages of low production cost, high product performance and high added value, improves the production efficiency and economic benefits, and has great popularization significance.

Description

technical field [0001] The invention relates to the technical field of iron and steel materials, in particular to a production method for producing ultra-thick and high-strength steel plates for construction with excellent thickness direction performance based on a single frame of continuous casting slabs. Background technique [0002] With the rapid development of my country's national economy, the demand for thick-gauge steel plates in various fields is increasing, especially in high-rise buildings. Thick-gauge steel plates are generally used in key components, so there are extremely strict requirements for the mechanical properties of steel plates, especially the thickness direction properties. requirements. In order to effectively transmit the rolling force to the core, improve the performance of the core, and ensure the uniformity of the structure and properties of the steel plate in the thickness direction, it is generally believed that the rolling compression ratio mus...

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Problems solved by technology

This production method needs to add a cooling device with a long interval between rough and finish rolling. On the other hand, the large temperature difference bet

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