Why Graphite Dies are Used for Continuous Casting

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The process of continuous casting is a metallurgical process that allows consistent control of the transformation from metal in a liquid state to the solid one. This transformation allows to directly obtain semi-finished products such as Tubes, Rods, Wires, Custom sections and Strips. The graphite heater or graphite fie is used in the transformation, which allows the shaping of the metal and the heat extraction essential to change the metal form from solid to liquid.

The continuous casting of precious and non-ferrous metals and the casting related to grey iron represent a broader used manufacturing technique. The technique provides the benefit of constant production and makes sure optimal material quality as a consequence of instant solidification. Two highly-useful features are the absence of shrink holes and the product structure’s uniformity. As the resultant casting metal surfaces are usually flawless and smooth, extensive finishing is not generally required.

  • A difference can be created among;
  • Vertical casting,
  • Horizontal continuous casting,
  • Vertical casting, not furnace dependent,
  • Vertical casting, furnace dependent.

The layout of the casting tool and the casting process are homogenous in all cases. An essential part of the continuous casting machine is the cooling equipment. The equipment comprises of a water-cooled jacket and the mold (die). Graphite combines a variety of favorable attributes. Therefore it is used as graphite continuous casting die mold.

Graphite – Metal with Phenomenal Characteristics

Unlike many materials, the flexural, compressive and tensile strength of graphite goes up as the temperature increases to 2,700 K – beyond which they start to decrease. Graphite has around twice the strength of its room temperature. The temperature coefficient concerning graphite electrical resistivity is negative, contrary to metals. Graphite is believed to have good electrical conductivity. Graphite has a few free electrons, and it acts as the insulator. The electrical conductivity increases as the temperature rises. The thermal conductivity of graphite keeps varying from one grade of graphite to another. However, it differs with the degree of graphitization.

Selection of Graphite Grades

It mainly depends upon the alloy composition to be cast. Grey iron needs graphite resistant to put on abrasion. Non-ferrous alloys comprising elements cobalt or nickel require high-density graphite to minimize the chemical attack of the graphite’s die.

Wrap Up

  • The other parameters that define the graphite’s degree include;
  • Casting speed,
  • The whole amount of alloy to be casted
  • Vertical or horizontal casting and;
  • The shape and size of the cast section.

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