Online heating device for continuous casting round bloom

Abstract

The invention discloses an online heating device for a continuous casting round bloom. The device comprises a heating module arranged on the continuous casting round bloom, wherein the heating module comprises a cambered iron corn, an inductive coil wound on the iron core and an alternating current power supply connected with two ends of the inductive coil; the iron core is close to the continuous casting round bloom from the inner arch side and encloses a section of the inner arch side on the continuous casting round bloom; vortex is excited inside a casting blank by adopting an inductive heating mode; the inner arch side of the round bloom is heated on line by means of Joule heat generated by the vortex, heat is not transferred from the outside to the inside. The device has the advantages of high heating efficiency, high heating speed no smoke or dust pollution, the adoption of power frequency power supply, no need of variable frequency treatment, low investment cost and the like; and the device can be controlled simply, a continuous or intermittent heating mode can be adopted according to requirement, and the heating intensity can be controlled by changing volume of current.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to equipment used in the straightening process of continuous casting large round billets. Background technique [0002] The high-temperature mechanical properties of steel are directly related to the cracks of continuous casting slabs. From figure 1 It can be seen that when the temperature is lower than 900 °C, the plasticity of the steel decreases significantly. Therefore, in continuous casting production, it is generally required that the surface temperature of the slab in the straightening zone must be greater than 900°C to avoid cracks. [0003] In the continuous casting of large round slabs, due to the low casting speed and the long residence time of the slab, the surface temperature of the slab in the straightening zone is too low, and the slab is prone to cracks. The heat preservation cover is set between the fan section and the tension leveler, but the e...

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Problems solved by technology

[0003] In the continuous casting of large round slabs, due to the low casting speed and the long residence time of the slab, the surface temperature of the slab in the straightening zone is too low, and the slab is prone to cracks. The heat preservation cover is set between the fan section and the tension leveler, but the effect is still unsatisfactory. figure 2 This is the surface temperature distribution diagram of the continuous casting large round billet when the heat preservation cover is used for heat preservation. It can be seen from the figure that the surface temperature of the straightening zone of the large round billet with a diameter of 700mm is 700℃- Between 800°C and significantly lower than 900°C, since the surface of the inner arc side will be stretched and deformed during the straightening process, surface cracks are prone to appear on the inner arc side

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