JPS60196253A - Header pipe for billet cooler of continuous casting machine for round billet - Google Patents

Abstract

PURPOSE:To make cooling of a billet uniform by connecting cooling water supply pipes to a concentrical header pipe provided around the billet in the tangential direction thereof and injecting mist-like cooling water from the holes on the inside of the header pipe toward the billet in the direction tangential thereto. CONSTITUTION:An annular header pipe 3 fixed concentrically with a round billet 1 moving horizontally is provided around the round billet and at least two supply pipes 4 for cooling water are connected to the pipe 3 in the tangential direction thereof. At least two cooling water injection holes 5 inclined at a prescribed angle toward the tangential direction of the billet 1 are provided on the inside of the pipe 3. The mist-like cooling water consisting of a mixture composed of the cooling water and air supplied into the pipe 4 is thereby injected along the circumferential direction of the billet 1 surface from the holes 5 while said billet is rotated at a high speed along the pipe 3. The uniform cooling of the round billet is thus made possible and generation of longitudinal cracks and flaws is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a header pipe for a billet cooling device for a round billet continuous casting machine.

In recent years, attempts have been made to manufacture round billets as a material for seamless pipes using continuous casting machines.

The basic structure of the above continuous casting machine is the same as that of a conventional slab continuous casting machine.

The key to continuous casting of round billets is how to uniformly cool the high-temperature round billets after casting.

A conceivable cooling device for a round billet is one in which a plurality of nozzles 2 are fixed concentrically around a round billet 1 so as to face the round billet 1, as shown in FIG.

However, when the round billet 1 is cooled by the above-mentioned cooling device, the part where the jetted cooling water ramps (A in Fig. 1)
part) has a lower cooling capacity than other parts, so it is not possible to uniformly cool the round billet].

If the round billet cannot be cooled uniformly, cracks (vertical cracks) will occur on the surface of the round billet in the casting direction, resulting in loss of product value.

From the above-mentioned viewpoint, the present invention provides a header pipe for a round billet cooling device that can uniformly cool five round billets made in a row, and the present invention provides a header pipe for a round billet cooling device that is capable of uniformly cooling five round billets made in a row. It is composed of a ring-shaped header pipe fixed concentrically, and at least two mist-like cooling water supply pipes connected to the header pipe in the tangential direction of the header pipe, and the inner side of the header pipe. The present invention has four characteristics in that at least two of the cooling water injection holes are provided in the tangential direction of the front round billet.

One embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a front view showing one embodiment of the header pipe of the present invention.

In Fig. 2, numeral 3 is a horizontally movable round billet) and a ring-shaped header pipe fixed around 1 in a circular shape. Reference numeral 4 designates at least two supply pipes for supplying cooling water in the form of a mixture of cooling water and air to the header pipe 3. The supply pipe 4 is tangential to the header pipe 3 in the tangential direction of the header pipe 3. Inside the header pipe 3,
At least two mist-like cooling water injection holes 5 are formed which are inclined at a predetermined angle (θ) toward the tangential direction of the round billet 1.

Since the supply pipe 4 is connected to the header pipe 3 in the tangential direction, the mist cooling water supplied from the supply pipe 4 to the header pipe 3 rotates at high speed along the herator pipe 3 and reaches each injection hole. 5, it is sprayed towards the surface of the round billet.

Thereby, the mist-like cooling water forms a swirling flow B that flows along the circumferential direction on the surface of the round billet 1. Since the swirling flow B flows along the surface of the round billet 1 for a certain period of time, the round billet 1 is uniformly cooled.

As explained above, according to the present invention, a round billet can be cooled uniformly, so that useful effects such as being able to prevent the occurrence of vertical cracks are brought about.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional cooling method, and FIG. 2 is a front view showing one embodiment of the present invention. In the drawings, 1...Round billet 2...Nozzle 3...Header pipe 4...Supply pipe 5 Injection hole applicant Nippon Kokan Co., Ltd. agent Nao Shioya (and 2 others) Child 1

Claims (1)

[Claims] A ring-shaped header fixed concentrically around a horizontally moving round billet, and at least two mist cooling water supply pipes connected to the header pipe in a tangential direction of the header pipe. A billet for a continuous round billet casting machine, characterized in that -1 and at least two cooling water injection holes are provided inside the header pipe in a tangential direction of the round billet. Header pipe for cooling equipment.