Intermediate-frequency induction and directional solidification ingot casting process and equipment utilizing same

Abstract

The invention discloses an intermediate-frequency induction and directional solidification ingot casting process and equipment utilizing the same, which are used for producing extra-thick plates capable of guaranteeing internal quality of ingots and meeting requirements of the compression ratio. The intermediate-frequency induction and directional solidification ingot casting process includes that after being subjected to external refining, molten steel is delivered to an ingot casting platform by the aid of steel ladles and then used for casting, is poured into tundish through a long nozzle,and then is poured into a water-cooled crystallizer in a protected manner after flowing through a slide nozzle and an embedded nozzle; a vibration device of the crystallizer vibrates to start intermediate-frequency coils arranged outside the water-cooled crystallizer, heating of induction current and electromagnetic stirring effect are realized to control stop time, power and frequency of the induction coils at different positions of steel ingots so as to control internal quality of the steel ingots; a drawing device of a water-cooled underpan is started to draw the steel ingots from the water-cooled crystallizer, and finally the steel ingots are sent to be rolled. According to the distribution characters of an induced magnetic field in an intermediate-frequency electric induction furnace, inverted-V type segregation of the steel ingot is avoided. Gas impurity can be removed according to the electromagnetic stirring principle. Excellent feeding capacity of steel ingots is guaranteed, and the steel ingots casted by the process have compact insides and are free of segregation and low in impurity by the aid of an upper heat center utilizing induction heating. Due to better head feeding, the yield and production efficiency of steel ingots are improved.

Description

technical field [0001] The invention relates to an ingot casting method and its device in the steelmaking production process, in particular to a medium frequency induction directional solidification ingot casting method and its device. Background technique [0002] Extra-thick steel plates over 100mm are commonly used in shells of atomic power stations, bases of high-rise buildings, offshore oil platforms, high-pressure vessels, aircraft carrier armor plates, heavy chemical reaction towers, hydropower, thermal power, wind turbine bases, etc., which are high performance, high purity, high Value-added products, most of which require ultrasonic flaw detection, and some also require Z-direction performance. At present, there are several options for the raw materials used in the production of the above-mentioned equipment. When continuous casting wide and thick slabs are used, the effect is not good due to insufficient compression ratio; Porosity and other casting defects cannot...

AI Technical Summary

Problems solved by technology

However, this method has low production efficiency, high power consumption, and many processes, so it is not ideal in terms of technical and economic indicators.

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