QT500-7 ductile iron QT450-10 plate

Ductile Iron - Plate Ductile Iron
-:..A general name for alloys mainly composed of iron, carbon and silicon. These alloys contain more carbon than can be retained in the austenite solid solution at the eutectic temperature. Cast iron is a general term for alloys mainly composed of iron, carbon and silicon. These alloys contain more carbon than can be retained in the austenite solid solution at the eutectic temperature.
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-:..An iron-carbon alloy with a carbon content of more than %. Industrial cast iron generally contains % to % carbon. Carbon mostly exists in the form of graphite in cast iron and sometimes in the form of cementite. In addition to carbon, cast iron also contains % to % of silicon and elements such as manganese, phosphorus, and sulfur. Alloy cast iron also contains elements such as nickel, chromium, molybdenum, aluminum, copper, boron, and vanadium. Carbon and silicon are the main elements that affect the microstructure and properties of cast iron.
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-:..Cast iron can be divided into
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-:..①Gray cast iron. The carbon content is relatively high (.%~.%), and the carbon mainly exists in the form of flake graphite. The fracture surface is gray and is referred to as gray iron. Low melting point (~℃), small shrinkage during solidification, compressive strength and hardness close to carbon steel, and good shock absorption. Used to manufacture machine tool beds, cylinders, boxes and other structural parts.
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-:..②White cast iron. The carbon and silicon content are low, and the carbon mainly exists in the form of cementite and the fracture surface is silvery white. It shrinks greatly during solidification and can easily cause shrinkage holes and cracks. High hardness and brittleness cannot withstand impact loads. It is mostly used as a blank for malleable iron and to make wear-resistant parts.
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-:..③ Malleable cast iron. After annealing white cast iron, the graphite is distributed in a flocculent form, which is referred to as tough iron. Its structural properties are uniform, wear-resistant, and has good plasticity and toughness. Used to manufacture parts with complex shapes that can withstand strong dynamic loads.
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-:..④ Ductile iron. After the gray cast iron molten iron is spheroidized, the precipitated graphite is spherical, which is referred to as ductile iron. It has higher strength, better toughness and plasticity than ordinary gray cast iron. Used in the manufacture of internal combustion engines, auto parts, agricultural machinery, etc.
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-:..⑤Vermicular graphite cast iron. After the gray cast iron molten iron is vermiformed, the precipitated graphite is obtained in the shape of worms. The mechanical properties are similar to ductile iron, and the casting performance is between gray cast iron and ductile iron. Parts used in manufacturing automobiles.
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-:..⑥Alloy cast iron. Ordinary cast iron is obtained by adding appropriate amounts of alloying elements (such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc.). Alloying elements change the matrix structure of cast iron to have corresponding heat resistance, wear resistance, corrosion resistance, low temperature resistance or non-magnetic properties. Used to manufacture parts for mining, chemical machinery, instruments, meters, etc.
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