SU406906A1 - - Google Patents

Description

one

The proposal relates to casting steel.

There is a method of casting steel with mixing of the metal in the mold due to vacuum. However, this method does not eliminate the chemical heterogeneity of the ingot.

According to the proposed method, the mixing is conducted to a temperature of 10-20 ° C above the point more liquidly;

In the drawing, a {{o_l_d_a_d_a}) diagram of an apparatus for carrying out the method.

Vacuum chamber 1 is connected by pipeline 2 to a vacuum system to create a vacuum. Through the lined pipes 3 and 4B, the liquid metal is sucked into the chamber. After turning on the electromagnetic pump 5, the liquid metal is poured into the mold through pipe 4. While maintaining the required vacuum in the vacuum chamber, the metal through the pipelines 3 will continuously flow into the vacuum chamber and through the pipe 4 continuously drain into the mold.

In this way, stirring flows are created in the liquid steel in the mold. This prevents the growth of columnar crystals near the wall of the mold and leads to uniform cooling of the liquid steel in the ingot volume: .

Upon reaching the crystallization temperature, the liquid melt solidifies at an intensive rate without formation in the ingot.

columnar crystals and whiskers with a uniform distribution of nonmetallic inclusions and a decrease in the length of the shrinkage ingot.

A vacuum chamber is installed on the mold (when casting from above, it is installed immediately after the P | termination of the supply of liquid metal to the mold). The mold is filled with metal above half the length of the pipelines for suction of the metal in order to maintain the desired level of liquid metal in the vacuum chamber. After stopping the supply of liquid metal into the mold, the Vacuum Chamber is connected to the vacuum system, the liquid metal is sucked into the vacuum chamber, after which the electromagnetic pump is turned on. A vacuum of about 0.5 atm gives the possibility of raising the level of the metal in the vacuum chamber, providing a free flow of metal from the suction pipes into the drain (with an electromagnet) pipe. Slag-forming slabs with a low melting point are supplied to the vacuum chamber through the dispenser 6. The vacuum system shuts off when the metal temperature reaches a temperature close to the liquidus point. After the metal and slag flow off, the vacuum chamber is removed, the ingot mold with the ingot is transferred to the stripper compartment using conventional technology.

Subject invention

The method of pouring metal, which consists in pouring the metal into the mold and mixing it by suction: back into the aquarium chamber and discharge into the mold, characterized in that, in order to crush the structure and eliminate chemical heterogeneity, stirring is brought to a temperature of 10-20 ° C above the liquidus point.