The main process of continuous casting

Abstract: This article describes the main equipment of the continuous casting machine and the main process of the continuous casting station.

Keywords: continuous casting; process; copper mould tube; mold powder

Introduction to continuous casting process

The main equipment of the continuous casting machine is: ladle support device, ladle, tundish, tundish car, copper mould tube, copper mould tube vibration device, billet guide and secondary cooling device, dummy bar, billet straightening device (tension straightener) , cutting equipment, slab conveying devices and slab cooling storage beds.

Main process of continuous casting station

The continuous casting station continuously passes the qualified molten steel provided by refining through the water-cooled copper mould tube, and after solidifying into a billet shell, it is continuously pulled out from the outlet below the copper mould tube. After continuous water mist cooling in the secondary cooling zone, the tube blank is formed into a continuous casting process after all solidification.

(1)Temperature control

Qualified molten steel temperature is one of the most important process parameters for the stability of the continuous casting process and for obtaining qualified cast slabs. In production, the temperature of molten steel is used as the main criterion for judging whether pouring can be carried out.

(2) Preparation before pouring

Preparation before pouring is crucial to the success of the pouring:

①Preparation of ladle

Ladles should use fast-turnover red envelopes, and the temperature of the baked ladles should reach a certain temperature. New ladles and new slag lines should not be used when opening the pouring furnace and changing the middle ladle.

② Preparation of tundish

At present, the intermediate bag used in our factory is an integral knotted bag. The advantage of this kind of bag is that the bag wall is smooth and not easy to fall off. It is more resistant to erosion than the smeared bag wall, and the baking time is shorter than that of the smeared bag.

③Inspection of copper mould tube

Check the working surface of the inner cavity of the copper mould tube. It is required that the copper pipe is not seriously damaged. Check whether the inlet and outlet water pressure is normal and there must be no water leakage. Check whether the vibration device is operating normally, whether the foot roller is rotating, whether the nozzles are complete, and whether the water spray is good.

(3) Inspection of secondary cooling area

Check whether the secondary cooling water supply system is normal. Open the water spray pipes in each section of the secondary cooling system and check whether the nozzles are complete and smooth.

(4)Pouring operation

After the rotary table receives the molten steel, it rotates the ladle to the pouring position and locks it. Drive the tundish truck above the copper mould tube to ensure that each outlet is strictly aligned with the copper mould tube. After the ladle is poured, when the molten steel capacity of the tundish reaches a certain amount, the fused magnesium is added, and then the high-carbon or low-carbon covering agent is added.

When the molten steel is injected into the mold, the liquid steel level in the mold continues to rise, and the starting time is different for different sections. Press the blank drawing button at the same time to start the stretch straightening machine and vibration mechanism, and then turn on the second cold water control button. After the copper mould tube liquid level is stable, put the copper mould tube liquid level control switch to automatic control. When adding protective slag into the copper mould tube, you should add it frequently and sparingly. If you find that the copper mould tube liquid level fluctuates greatly, you should pay attention to picking out the slag strips in time.

(5) Mold powder

Continuous casting mold powder is one of the materials in direct contact with molten steel. Its performance and quality will have an important impact on the quality of the cast slab. The metallurgical functions of mold slag mainly include the following: Isolating air to prevent secondary oxidation of molten steel. Absorb non-metallic inclusions to purify the steel slag interface; form a lubricating slag film between the solidified billet shell and the copper mould tube wall; improve heat transfer between the copper mould tube and billet shell; adiabatic insulation reduces heat loss of molten steel.

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