Metal casting is a very old technology invented in the history of mankind. The oldest casting facts recorded can be traced back to about 6800 years. Metal casting is a production method. The molten liquid material is poured into a mold. The mold is a hollow cavity of a desired shape. After it is cooled and solidified, it is taken out to obtain the desired casting.
Cast materials are usually metals or various ageing materials, which will solidify after mixing more than three or more components together. For example, epoxy resin, concrete, plaster and clay are the most common types. Castings are most commonly used to make complex shapes, which are often difficult or quite expensive to make by other methods such as cutting.
Iron casting or cast iron is a metal processing technology that can produce a group of iron-carbon alloys with carbon content greater than 2%. Its feasibility stems from its lower melting temperature.
The alloy composition changes its color when it breaks, that is, white cast iron has carbide impurities, allowing cracks to pass directly, gray cast iron has graphite flakes, the flakes will deflect through the cracks, and cause countless as the material breaks new crack.
In the metalworking industry, mineral casting is also called epoxy granite, which is synthetic granite because it is a mixture of epoxy and granite, which is widely used in machine tool industry. The reason why industrial users adopt epoxy granite rather than conventional alternatives is because compared with cast iron and steel, this new material is better in vibration damping, with longer tool lifespan, and lower assembly cost.
Ductile casting is also known as ductile cast iron, nodular cast iron, and sg iron; this is a type of graphite-rich cast iron discovered in 1943 by an American metallurgical engineer and inventor Keith Millis. While most varieties of cast iron are weak in tension and brittle, ductile iron has much more impact and fatigue resistance natures integrated, thanks to its nodular graphite inclusions.
In addition, ductile iron is not a single material, but a part of a group of materials, by changing its structure can create a material with a wide range of properties.
Since the human society entered the Bronze Age, casting has been the basis of all metal processing activities. Since then, we have found that with the deformation of metal objects, most supplies can be produced in a standardized way, whether it is the iron or mineral mentioned above or ductile casting. Based on the study of metallographic and heat treatment technology, the use of castings has been increasingly improved.
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