[carbon & Graphite Blocks] :- We offer a wider range of Graphite products like Graphite blocks, Graphite dies, Graphite moulds, Graphite seal, plate, rails, boats, Graphite rings, Graphite and carbon vanes, Graphite crucibles as well as Graphite Powder & Scrap.
Graphite Dies for Continous Casting :
[carbon & Graphite Blocks]
Continuous Casting Process is a metallurgical process which allows continuous control of the transformation from a liquid metal to a solid state in order to directly obtain semi-finished products like:
_ custom sections.
The graphite “die” used in this transformation, permits:
_ the shaping of the metal,
_ the heat extraction necessary to transform the metal from liquid to solid state.
The continuous casting of non-ferrous and precious metals and the casting of gray iron represent a widely used manufacturing method. This method offers the advantage of non-stop production and ensures optimum material quality as a result of rapid solidification. Two highly useful characteristics are the uniformity of product structure and absence of shrinkholes. As the resulting cast metal surfaces are generally smooth and unblemished, extensive finishing is not usually needed.
A distinction can be made between
• horizontal continuous casting,
• vertical casting,
• vertical casting, furnace-dependent,
• vertical casting, not furnace-dependent.
The design of the casting equipment and the casting process are similar in all cases. An important component of the continuous casting machine is the cooling device, which consists of a water-cooled jacket and a mold (die). Graphite combines a number of favorable properties and is therefore preferably used as a mold (die) material.
Graphite : The Material With Exceptional Properties :
Unlike most materials, the tensile, compressive and flexural strengths of graphite increase as temperature rises to 2,700 K, beyond which they fall again, graphite has about double its room temperature strength. The temperature coefficient of electrical resistivity of graphite is negative, unlike that of metals. Graphite has good electrical Conductivity. Near absolute zero,graphite has only a few free electrons and acts as an insulator. As temperature rises, electrical conductivity increases.
The thermal conductivity of graphite is higher than that of many metals and falls with increasing temperature.The thermal conductivity of graphite varies from one graphite grade to another but also with the degree of graphitization.
The coefficient of thermal expansion is in the order of 3 x 10 -6 K-1 and is, therefore, only about one quarter that of iron. It varies from grade to grade and depends on process conditions and the properties of the starting raw materials. Graphite grades differ only slightly in their specific heat
The selection of the best graphite grade for your application
[carbon & Graphite Blocks]
…depends mainly on the composition of the alloy to be cast: grey iron requires a graphite resistant to wear abrasion; brass, a graphite relatively dense but with enough open porosity to allow zinc to evaporate in the area of the solidification front; non-ferrous alloys containing elements like nickel or cobalt need high density graphite to reduce chemical attack of the graphite die...
The other parameters which determine the choice of the grade are:
_ the size and shape of the cast section,
_ the speed of casting,
_ the total amount of alloy to cast,
_ casting orientation (i.e, vertical or horizontal).
In addition to the graphite grade chosen, the casting results are also a function of die design, quality of machining, and the specific characteristics of the casting installation.Our grades have been developed in conjunction with foundrymen to obtain the proper blend of physical characteristics for continuous casting.
We can provide technical services to assist you infinding a suitable graphite for your application.
However, in many cases optimal grade selection can be made only through actual trials.The following application chart should be used only as an indicative guide for grade selection.
Open porosity is that part of the whole volume which can be filled with liquid.
Graphite is easy to machine – both edge strength and abrasion resistance are high. Complicated parts with close tolerances can be manufactured to high precision.
Graphite is not wetted by molten glass or by most molten metals.
Resistance to temperature change
Graphite is extremely resistant to thermal shock, so rapid heating or cooling is no problem.
Graphite does not melt; it sublimes at approximately 3,900 K. In air, graphite is stable up to a temperature of around 750 K.
The theoretical density of monocrystalline graphite is 2.26 g/cm3. The density of synthetic graphite is typically between 1.5 and 1.9 g/cm3, but as high as 2.1 g/cm3 for solid pyrolytic graphite. The density of the high-purity graphite grades is defined as the quotient of mass and volume, including all process.
GRAPHITE CARBON INDIA FARIDABAD MANUFACTUING PLANT
Mr. Pankaj chauhan
GRAPHITE CARBON INDIA
Email :- email@example.com
PLOT NO- 01, 33 FEET ROAD, OLD WAZIRPUR ROAD,
JEVAN NAGAR, PHASE-2, OLD FARIDABAD
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