Continuous casters' specific introduction 01

Number of continuous casters, machines and streams

In continuous casting production, a set of continuous casting equipment that shares a ladle and casts first-class or multi stream billets at the same time is called a continuous caster. A continuous caster can be multi unit or single unit. The so-called unit is a set of continuous casting equipment with independent transmission system and working system in a continuous casting machine, which can still work as usual in case of other machine accidents. For each continuous caster, the total number of billets that can be poured at the same time is called the flow number of continuous caster. Where a continuous caster has only one unit and can only pour one billet, it is called one machine first-class. If more than two billets can be poured at the same time, it is called one machine with multiple flows. Where a continuous caster has multiple units and casts multiple billets respectively, it is called multi machine and multi flow.

Compared with multi machine and multi flow, the equipment is light in weight; Investment province. However, if there is an outflow accident of one machine with multiple streams, the gold machine can be shut down, and the production operation and cooperation between streams are difficult. In recent years, the highest pouring flow of billet is 8, and most of them use 2 ~ 4. The slab can be poured with 4 streams at most, and most of them use 1 ~ 2 streams.

Composition of continuous casting machine and layout in workshop

Continuous steel casting equipment is mainly composed of 9 parts: ladle (steel drum) rotary table, ladle, tundish (tank), crystallizer (primary cooling), crystallizer vibration mechanism, secondary cooling device, billet drawing (straightening) device, cutting device and billet transportation device.

At present, the continuous casting workshop mainly has two layout forms: horizontal layout when the center line of the continuous casting machine is perpendicular to the column line of the plant, and vertical layout when the center line of the continuous casting machine is parallel to the column line of the plant. The former is suitable for workshops with large production scale and equipped with multiple casters, while the latter is mostly used in the transformation of old plants or when the number of casters is small.

Continuous caster operation process

Deoxidation alloying is carried out while the molten steel initially refined from the steelmaking furnace (converter, electric furnace and open hearth furnace) is injected into the ladle. Then it is transported to the ladle refining station to adjust the temperature and composition of molten steel and sent to the continuous casting platform. As it is difficult to control the flow of molten steel by pouring directly with ladle, the molten steel is temporarily stored in tundish and then poured into the mold. The liquid steel cools rapidly in the water-cooled mold to form a billet with solidified shell on the outside and non solidified molten steel on the inside. The solidified shell at the outlet of the lower end of the crystallizer shall have sufficient thickness to ensure that the internal liquid steel does not flow out (the outflow of liquid steel is called pull leakage). As the drawing roller slowly pulls the billet with liquid core out of the mold, the molten steel in the tundish is also continuously injected into the mold at the same time. In this way, a long billet with liquid core can be obtained. The billet with liquid core is forced cooled by water spray in the secondary cooling area. When it is pulled to the specified position, the interior of the billet is completely solidified. Then the billet is cut into the specified size and sent to the subsequent process by the billet discharging device.