Vertical continuous casting machine for seamless steel pipe blank

Abstract

The present invention relates to a vertical seamless steel pipe hollow pipe billet continuous casting machine. It is characterized by that it utilizes combination of internal crystallizer and external crystallizer to produce hollow pipe billets with various specification. Said continuous casting machine consists of internal crystallizer, external crystallizer, carryover pinch roll, dummy ingot cutting car and turnover roller way equipment. Said invention also provides their connection mode and concrete operation method of said continuous casting machine.

Description

technical field [0001] The invention relates to a vertical seamless steel pipe hollow billet continuous casting machine, which belongs to near-net shape continuous casting equipment in the production technology of seamless steel pipes in the field of metallurgy. The continuous casting machine adopts the combined use of inner and outer molds, and can produce hollow billets of various specifications, especially suitable for the production of alloy steel hollow billets with large diameters and difficult to perforate. The use of continuous casting hollow billets to produce seamless steel pipes can save the solid billet piercing process and simplify the production process as follows: hollow billets→rolling→cutting and sizing, and ultimately shorten the process flow, reduce equipment investment, and save energy. , The purpose of reducing production costs. technical background [0002] So far, almost all seamless steel pipe manufacturers in the world have produced seamless steel p...

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Problems solved by technology

[0002] So far, almost all seamless steel pipe manufacturers in the world have produced seamless steel pipes by casting slab → piercing → oblique rolling of waste pipe → continuous rolling pipe → reducing and sizing. This method pierces solid billet into hollow pipe The billet is a very important production process, because piercing directly affects the quality of rolled pipes, so manufacturers have to invest huge sums of money in the piercing process, building heating furnaces, installing piercing machines, and purchasing supporting equipment, which not only increases equipment investment, but also lengthens production. process, which will inevitably increase the energy consumption and production cost per ton of steel

In order to improve the traditional production process, people have done a lot of research and exploration, such as centrifugal casting method, arc coreless continuous casting method, sleeve mold billet casting method, all of which are to seek new equipment and new methods for the production of hollow tube blanks. However, the reason why these methods have not been widely used is that they all have shortcomings and deficiencies in varying degrees.

[0003] a. Centrifugal casting method, that is, casting molten steel in a centrifuge, and obtaining a hollow tube billet through the rotation and cooling of the centrifuge. Although this method can cast a hollow tube billet with good quality, it is interrupted due to the process and low production efficiency. , it is difficult to achieve continuous and large-scale production, especially the cleaning of impurities on the surface of the tube blank is very difficult, so it has not been widely used

[0004] b. Arc-shaped coreless continuous casting method. This method is to cast molten steel in an arc-shaped continuous casting machine with only an outer mold, and form a hollow tube billet under the cooling of the arc-shaped outer mold. The arc is 180 degrees, and it needs to be straightened before it can be used. Since the thickness of the hollow billet cast by this method is completely controlled by the cooling strength of the mold, and the inner wall of the billet is in a natural crystallization state, it is easy to produce uneven thickness and dendritic crystallization points. , resulting in a very rough inner wall of the tube billet, which ultimately affects the rolling quality of the steel tube

[0005] c. Sleeve mold billet casting method, which is to cast molten steel into a tubular mold with inner and outer water cooling (equivalent to inner and outer crystallizers), and after the molten steel solidifies into a tube blank, lift the water-cooled mold to take the tube blank away , this method is similar to the water-cooled steel ingot mold ingot casting method. Many water-cooled molds are required for billet casting. Although this method can cast a tube billet with a smooth surface, it cannot achieve continuous and large-scale production due to intermittent processes and low production efficiency. not widely adopted

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