Continuous casting billet solidification end single-point and continuous heavy reduction technology

Abstract

The invention provides a continuous casting billet solidification end single-point and continuous heavy reduction technology and belongs to the field of continuous casting production. The heavy reduction technology is completed through 1-3 fan-shaped sections. Each fan-shaped section comprises 5-7 pairs of pinch rolls, wherein each pair of pinch rolls comprises an upper supporting roll and a lower supporting roll. The single-point reduction of 3-20 mm is exerted on the upper supporting roller at an inlet of each fan-shaped section, so that the single roll reduction effect is achieved; and in this way, the strain rate of the heart portion of a casting billet can be effectively improved, and welding of a central pipe and the improvement on the density of the heart portion of the casting billet are facilitated. Meanwhile, the billet is continuously rolled by the follow-up upper supporting rolls of each fan-shaped section at the reduction rate of 1.5-5.0 mm / m, and it is guaranteed that the casting billet cannot rebound after rolling is conducted. Besides, a billet shell of the casting billet is forced to continuously shrink, and therefore the looseness caused by the difference between the inner shrinkage rate and the outer shrinkage rate of the casting billet is relieved.

Description

technical field [0001] The invention belongs to the field of continuous casting production, and in particular relates to a single-point and continuous heavy reduction process at the solidification end of a continuous casting slab. Background technique [0002] The heavy reduction technology at the solidification end of the continuous casting slab is to implement a large amount of reduction at the end of the continuous casting slab solidification and after solidification, and make full use of the characteristics of the large temperature difference between the inside and outside of the slab (the core temperature of the slab is high, and the center temperature is low), so that The reduction amount is fully transmitted to the core of the slab to achieve the process effect of welding solidification shrinkage cavity and even refining the austenite grains in the core. [0003] According to this concept, researchers at home and abroad have also proposed a corresponding heavy reducti...

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Problems solved by technology

On the other hand, the single-roll reduction cannot control the rebound deformation of the slab after reduction, and due to the existence of the temperature gradient inside and outside the slab, the thermal shrinkage rate of the core of the slab is significantly higher than that of the slab during the gradual cooling process of the slab. surface, so the core of the slab will continue to produce porosity

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