Square bloom continuous casting manufacturing method facilitating elimination of core defects

Abstract

The invention provides a square bloom continuous casting manufacturing method facilitating elimination of core defects and belongs to the field of large-section square bloom production. According to the square bloom continuous casting manufacturing method, the continuous casting blank soft reduction technology and the hot core high-temperature heavy reduction rolling technology are optimized and combined. The core macrosegregation defects are eliminated in the soft reduction process; heavy-reduction rolling mills are directly arranged behind a continuous casting straightening and withdrawing machine, the online opposite reduction rolling process is implemented by making full use of cold outside and hot inside temperature field features of a casting blank under the complete solidification state of the casting blank to eliminate the defects such as core shrinkage cavity porosity.

Description

technical field [0001] The invention relates to the field of large-section billet production, specifically a high-quality casting billet production method that comprehensively utilizes continuous casting billet soft reduction technology and hot core high-temperature high-reduction rolling technology to carry out low macro segregation and shrinkage cavity defects . Background technique [0002] Usually, rolled products such as high-quality large cross-section bars are produced by hot rolling with blooms as raw materials, so the quality control of billets in continuous casting production plays a decisive role in the quality of final steel products. The main defects of the bloom are central shrinkage cavity, porosity and segregation, etc. If the defects in the core of the billet cannot be controlled in the continuous casting production and eliminated in the hot rolling production, central cracks and network and banded structure defects will occur , may have adverse effects on ...

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