Ductile iron casting parts require higher hardness as bearings, and the cast iron parts are often quenched and tempered at low temperature. The process is: various castings are heated to a temperature of 860-900 ° C, the original substrate is all austenitized and then cooled in oil or molten salt to achieve quenching, and then heated and tempered at 250-350°C, the original matrix conversion For tempered martensite and retained austenite structure, the original spheroidal graphite has the same shape. The treated casting has high hardness and certain toughness, retains the lubricating property of the graphite, and the wear resistance is further improved.
Ductile iron castings are used in many industries, which is mainly related to the special properties of ductile iron castings. The English name of ductile iron is called ductile cast iron. It is a kind of high-strength cast iron material. Its comprehensive performance is close to that of steel. It is based on its excellent performance and has been successfully used for casting some complex forces, strength, toughness and resistance. Parts with higher wear requirements. Ductile iron castings have rapidly developed into cast iron materials that are second only to gray cast iron and are widely used. Cast iron is an iron-carbon alloy with a carbon content of more than 2.11%. It is obtained by high-temperature melting and casting of steel and its alloy materials such as industrial pig iron and scrap steel. In addition to Fe, carbon in other cast irons is precipitated in the form of graphite. If the precipitated graphite is in the form of a strip, the cast iron is called gray cast iron or gray cast iron, the cast iron in the form of a worm is called vermicular cast iron, and the cast iron in the form of a floc is called white cast iron or code iron, and is spherical. Cast iron is called ductile iron.
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