What are the contents of the continuous casting production process?

2023-08-21 15:30

Continuous casting is an intermediate link connecting steelmaking and rolling, and is an important component of a steelmaking plant (or workshop). The continuous casting production process includes: ladle, tundish, crystallizer, secondary cooling, billet straightening, cutting, roller conveyor, pusher, and casting billet. Some continuous casting production processes include: preparation of billets, static pressure forming, drying, heat treatment, shaping, X-ray inspection, surface anti oxidation coating, packaging and warehousing. Due to different products and processes, the process also varies.

1、 The general process of continuous casting production process

1. Load the molten liquid steel into a ladle and lift it to the top of the continuous casting machine using a crane (bridge crane);

2. Inject the liquid steel from the ladle into the continuous casting machine for continuous casting production, and pull out the continuous casting billet from below the continuous casting machine;

3. Use flying shear to cut the continuous casting billet to a certain length, and then send it into a tunnel soaking pit;

4. The continuous casting billet slowly advances in the tunnel soaking pit to ensure uniform and constant temperature of the continuous casting billet; (Note: The length of tunnel soaking pits is usually between 100-200 meters, or even longer up to 250m)

5. The continuous casting billet comes out from the other end of the tunnel soaking pit and enters the hot continuous rolling unit for rolling;

6. The rolled steel enters the water-cooled section for laminar cooling;

7. The steel after laminar cooling enters the coiling machine for coiling;

8. The rolled steel is transported by a crane to the finished product warehouse for storage.


2、 Detailed process of continuous casting production process

1. Preparation of billets

This includes processes such as ingredients, mixing, granulation, and drying. Batching is the accurate batching of raw materials according to a predetermined mass percentage; Mixing and granulation are the process of mixing prepared materials, adding binders, and using a granulator to granulate and dry the pellets to meet the molding conditions. The commonly used mixing and granulation equipment is a high-speed mixer. When adding materials, aggregates, resins, graphite, and pre mixed powder are added first. The high-speed mixer also has the function of granulation. The drying equipment can use ordinary refractory material conventional drying equipment or fluidized bed drying equipment, with a general requirement that the drying temperature does not exceed 80 ℃.

2. Forming

Add the granular material obtained in one step to the composite rubber mold with a steel core in the middle. When adding materials, it is necessary to pay attention to adding them separately from different parts, and after sealing, wait for the static press to press and shape them. At the same time, select appropriate pressure and pressure increase, pressure maintaining, and pressure relief curves.

3. Drying and heat treatment

Dry and eliminate the volatile matter in the material, and then calcine it under the condition of isolating air to decompose and carbonize the resin, forming carbon bonding and giving the material a high bonding strength. The heat treatment equipment is mostly shuttle kilns, and the heat treatment temperature is often between 1000~1250 ℃.

4. X-ray inspection

During continuous casting production, it is required to prevent any internal damage to the product, and non-destructive testing should be used for product testing. The instrument used is an X-ray flaw detector.

5. Processing and surface coating

The external dimensions of the isostatic pressing formed products, especially the matching dimensions, cannot meet the required accuracy. Partial or all external dimensions of the "three major parts" products need to be processed. At the same time, to prevent oxidation during on-site baking and use, the surface of the product should be coated with protective paint. The prepared coating can melt into glaze at lower temperatures (600-750 ℃), and can be well spread on the product surface and maintain viscosity without significant changes over a wide temperature range, playing a role in protecting graphite from oxidation.

The main advantage of the continuous casting production process is that it simplifies the production process, eliminates the demolding, whole mold, ingot heating, and billet opening processes of the mold casting process, saves 40% in infrastructure investment, reduces 30% in floor area, saves 40% in operating costs, reduces the consumption of refractory materials by 15%, and also improves the metal recovery rate, greatly reducing the loss of steel billet cutting head and tail, and improving the metal recovery rate by about 9%, Moreover, it also reduces energy consumption in the production process, which can save the combustion power consumption of the ingot soaking pit, and reduce energy consumption by 1/4 to 1/2. The most important thing is to improve the mechanization and automation level of the production process.

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