A method for treating the head of the starting casting blank in a continuous casting and rolling production line

Abstract

The present invention relates to a method for treating the head of a starting casting slab in a continuous casting and rolling production line, belonging to the technical field of continuous casting and rolling production processes in the metallurgical industry. The technical solution is as follows: After the head of the starting casting slab is sheared and broken by a swing shear, it is further sheared into billets of a fixed length and sent to a tunnel furnace for heating. The swing shear continuously shears and breaks 1-5 times, with each shear being 0.5 meters. The broken casting slab falls into the collection hopper below for collection. The temperature of the head of the starting casting slab is 860-950 °C. The beneficial effects of the present invention are: It can reduce the loss of casting slabs, maximize the metal yield, and at the same time ensure the quality of continuous casting billets and the rough rolling starting temperature.

Description

Technical Field

[0001] The present invention relates to a method for treating the head of a continuously cast and rolled billet in a continuous casting and rolling production line, belonging to the technical field of continuous casting and rolling production processes in the metallurgical industry. Background Art

[0002] Continuous casting and rolling, also known as continuous casting and continuous rolling, is a process where liquid steel is poured into a continuous caster to produce a steel billet, called a cast billet. The cast billet enters a tunnel furnace without cooling and is directly rolled into shape in a hot continuous rolling mill after being kept warm in the tunnel furnace for a certain period of time.

[0003] After the continuous caster starts pouring, to ensure the quality of the cast billet, the head billet is sheared by a swing shear for 6 meters, enters the tunnel furnace, and then is swung out through the swing section of the tunnel furnace and treated as a scrap billet. Subsequently, the following cast billets enter the tunnel furnace for heating as 20-meter fixed-length billets and are then rolled through rough rolling. Therefore, one 6-meter head billet is taken offline as a scrap billet for each casting, which affects the metal yield. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for treating the head of a continuously cast and rolled billet in a continuous casting and rolling production line, which can reduce the loss of cast billets and maximize the metal yield, and solve the problems existing in the background art.

[0005] The technical solution of the present invention is as follows:

[0006] A method for treating the head of a continuously cast and rolled billet in a continuous casting and rolling production line. After the head of the continuously cast and rolled billet is broken by a swing shear, it is cut into fixed-length billets and sent to the tunnel furnace for heating.

[0007] In the above method for treating the head of a continuously cast and rolled billet in a continuous casting and rolling production line, the swing shear continuously breaks 1 - 5 times, and each cut is 0.5 meters.

[0008] In the above method for treating the head of a continuously cast and rolled billet in a continuous casting and rolling production line, the swing shear continuously breaks 3 times, each cut is 0.5 meters, and the total is 1.5 meters.

[0009] In the above method for treating the head of a continuously cast and rolled billet in a continuous casting and rolling production line, the broken cast billets fall into the lower collecting hopper for collection.

[0010] In the above method for treating the head of a continuously cast and rolled billet in a continuous casting and rolling production line, the temperature of the head of the continuously cast and rolled billet is 860 - 950 °C.

[0011] The beneficial effect of the present invention is that it can reduce the loss of cast billets, maximize the metal yield, and at the same time ensure the quality of continuous cast billets and the rough rolling starting temperature. Brief Description of the Drawings

[0012] Figure 1 It is a schematic diagram for treating the head billet of continuous casting in the present invention;

[0013] In the figure: the first cut-to-length continuous casting slab 1, the head of the starting casting slab 2, the flying shear 3, the tunnel furnace 4, the rough rolling mill 5, and the collecting hopper 6. Specific embodiments

[0014] The present invention will be further described below with reference to the accompanying drawings by way of examples.

[0015] Refer to the attached Figure 1 , a method for processing the head of a starting casting slab in a continuous casting and rolling production line. The temperature of the head 2 of the starting casting slab is 860 - 950 °C. After the head 2 of the starting casting slab is broken by the flying shear 3, it is further cut into cut-to-length slabs and sent to the tunnel furnace 4 for heating. The broken casting slabs fall into the collecting hopper 6 below for collection.

[0016] The flying shear continuously breaks 1 - 5 times, and each cut is 0.5 meters.

[0017] In this example, refer to the attached Figure 1 , which includes a flying shear 3, a tunnel furnace 4, a rough rolling mill 5, and a collecting hopper 6 arranged below the flying shear 3.

[0018] After the continuous caster starts casting, the following operations are carried out for control:

[0019] ① The temperature of the head of the casting slab is 900 °C. After the head 2 of the starting casting slab arrives, the flying shear 3 continuously breaks 3 times, each cut is 0.5 meters, a total of 1.5 meters. The broken casting slabs fall into the collecting hopper 6 below through the roller table gap;

[0020] ② The subsequent casting slabs are cut into 20 - meter cut-to-length slabs by the flying shear 3 and then enter the tunnel furnace 4 for heating through the roller table;

[0021] ③ After the casting slabs are heated to 1100 °C in the tunnel furnace 4, they enter the rough rolling mill 5 for rolling.

[0022] Based on the following data statistics, the present invention can greatly reduce the loss of casting slabs: 4.5 meters less of slab is cut per casting heat. Calculated according to the casting slabs with conventional width and thickness, it is about 4.5 tons in total. Calculated based on an average of 55 casting heats per month, 247.5 tons of casting slabs can be cut less per month, and 2970 tons per year in total.

Claims

1. A method for treating the head of the starting casting billet in a continuous casting and rolling production line, characterized in that: After the head (2) of the starting casting billet is broken by a swing shear (3), it is then cut into a fixed-length billet and sent to a tunnel furnace (4) for heating; the swing shear (3) continuously breaks 1-5 cuts, and each cut shears 0.5 meters.

2. The method for treating the head of the starting casting billet in a continuous casting and rolling production line according to claim 1, characterized in that: The swing shear (3) continuously breaks 3 cuts, each cut shears 0.5 meters, for a total of 1.5 meters.

3. The method for treating the head of the starting casting billet in a continuous casting and rolling production line according to claim 1, characterized in that: The broken billet falls into the lower collecting hopper (6) for collection.

4. The method for treating the head of the starting casting billet in a continuous casting and rolling production line according to claim 1, characterized in that: The temperature of the head (2) of the starting casting billet is 860-950 °C.

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