Online continuously cast billet surface strengthening quenching treatment equipment system and process

Abstract

Provided are an online continuously cast billet surface strengthening quenching treatment equipment system and process. A quenching tank is arranged between a continuously cast billet roller bed of acontinuous casting production line and a heat conveying process or slow cooling heat preservation procedure to carry out online forced cooling on a continuously cast billet, the surface of the continuously cast billet can stride across the microalloy element carbo-nitride separation critical temperature area, separation and gathering of microalloy element carbo-nitride can be avoided, and therefore the continuously cast billet surface crack happening probability is effectively reduced, and the aim of improving the surface quality of the continuously cast billet and then increasing the yield afinished rolled piece is achieved.

Description

technical field [0001] The invention relates to metallurgical continuous casting technology, in particular to an online continuous casting slab surface strengthening quenching treatment equipment system and process, by setting a quenching tank between the continuous casting slab roller table of the continuous casting production line and the hot delivery process or slow cooling and heat preservation process On-line forced cooling of the continuous casting slab can make the surface of the continuous casting slab jump over the critical temperature zone for the precipitation of carbonitrides of microalloying elements, so as to prevent the precipitation and aggregation of microalloying elements carbonitrides, thereby effectively reducing the occurrence of cracks on the surface of the continuous casting slab Probability, to achieve the goal of improving the surface quality of continuous casting slabs and thus increasing the pass rate of rolled products. Background technique [000...

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Problems solved by technology

However, when the inventors studied microalloyed steel continuous casting slabs, they found that microalloyed high-strength steel continuous casting slabs such as Nb, V, Al, Ti, etc. that have requirements for sulfur, aluminum, and nitrogen often have problems such as surface microcracks.

Such continuous casting slabs are prone to defects such as surface cracks after rolling, and the rolled steel needs to be straightened, ground, flaw detected and other processes, and even secondary grinding and flaw detection is required. The pass rate is low and timely delivery cannot be met. Need and result in low production efficiency and increased cost

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