Why graphite molds are generally used for continuous casting method?

Introduction:

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Graphite molds play a crucial role in the process of continuous casting. In this article, we will explore why graphite molds are preferred, the materials that require their use, and the advantages of using graphite over other materials.

Why Graphite Molds?

Graphite molds are widely used in continuous casting due to their unique properties. Graphite has excellent thermal conductivity, which allows for efficient heat transfer. This is crucial in maintaining the desired temperature during the casting process.

Materials that Require Graphite Molds

Graphite molds are commonly used in the continuous casting of metals such as steel, aluminum, and copper. These materials require graphite molds due to their high melting points and the need for precise temperature control during the casting process.

Advantages of Using Graphite Molds

Using graphite molds in continuous casting offers several advantages. Graphite molds have excellent thermal conductivity, which allows for efficient heat transfer. This results in improved casting quality and reduced casting defects. Additionally, graphite molds have good chemical resistance, which makes them suitable for a wide range of casting applications.

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In conclusion, graphite molds are widely used in continuous casting due to their unique properties. Graphite has excellent thermal conductivity, which allows for efficient heat transfer. This results in improved casting quality and reduced casting defects. Additionally, graphite molds have good chemical resistance, which makes them suitable for a wide range of casting applications.

Concept:

The continuous casting process is also known as the Strand casting process is used to produce billets, blooms, or slabs much longer in length than obtained by any process. It was initially developed for non-ferrous metal strips. Now continuous casting process is used in steel production with improvement in efficiency and productivity with significant cost reduction.

Steps in continuous casting:

• The molten metal is transferred from a holding furnace into a special label called tundish.
• Molten metal from tundish is poured into the top of the bottomless graphite mould of the desired shape.
• The molten metal gets gradually solidified as it is poured
• The obtained parts are then subsequently rolled into rolling mills.

The mould is open at both ends and is kept filled at all times. The metal at the lower end of the mould is cooled so that it gets solidified and the solid product thus formed is extracted in a continuous length from its lower end.

The shapes of the casting produced from continuous casting are round ingots, slabs, square billets as well as hex-billets.

Graphite is a solid lubricant. Low friction between the mold surface and the solidifying metal ensures smooth withdrawal (extraction) of the casting without cracks and minimizes the thickness of the defective peripheral skin. The specific layered crystal structure of graphite determines its self-lubricating properties providing low friction without additional oil lubrication.

. Low friction between the mold surface and the solidifying metal ensures smooth withdrawal (extraction) of the casting without cracks and minimizes the thickness of the defective peripheral skin. The specific layered crystal structure of graphite determines its self-lubricating properties providing low friction without additional oil lubrication.

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