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Industrial high wear resistant ball cast iron casting precision parts
Ducular iron casting is to obtain spherical graphite through spherulation and gestation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, so as to obtain higher strength than carbon steel. Ductile iron casting is a kind of high strength cast iron material developed in the 1950s. Its comprehensive performance is close to steel. It is based on its excellent performance that it has been successfully used for casting some parts with complex force, high strength, toughness and wear resistance. Ductile iron has rapidly developed into a widely used cast iron material second only to grey cast iron. The so-called "iron instead of steel", mainly refers to the ductile iron casting.
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Bullet iron castings have already been used in almost all major industrial sectors that require high strength, plasticity, toughness, wear resistance, severe heat and mechanical impact resistance, high or low temperature resistance, corrosion resistance, and dimensional stability. In order to meet these changes in use conditions, ductile iron casting provides a wide range of mechanical properties and kissing rational energy.
For example, as stipulated by the International Organization for Standardization 1501083, most of the ductile iron casting is mainly produced in a non-alloy state. Clearly, this range includes high strength signs with tensile strength greater than 800 Newton / mm and 2% elongation. At the other extreme is the high plastic plate, with elongation greater than 17% and correspondingly lower strength (minimum 370 Newton / mm spoon. Strength and elongation are not the only roots where the designer chooses the material, while other decisive and important properties include yield strength, elastic modulus, wear resistance and fatigue strength, hardness and impact performance. In addition, corrosion resistance and oxidation resistance and electromagnetic performance may be critical for the designers. To meet these special uses, a group of austenitic ball iron was developed, usually called Ao Ni and Resis dead ball iron. These austenitic spheres are mainly alloyed with zinc, chromium and manganese, and are listed in international standards.
Ductile iron casting composition
Pig iron is an iron carbon alloy with carbon content more than 2%, industrial pig iron carbon content is generally 2.5% -4%, and contains C, SI, Mn, S, P and other elements, is the product of iron ore smelting by blast furnace. According to the different forms of carbon existence in pig iron, it can be divided into steel and pig iron, cast pig iron and ductile iron casting.
The precipitated graphite is a spherical cast iron. The splitting effect of spherical graphite on the metal matrix is smaller than that of sheet graphite, so that the strength of cast iron reaches 70~90% of the tissue strength of the matrix, and the tensile strength can reach 120kgf / mm2, and it has good toughness. The chemical composition of ductile iron except iron is usually: carbon content 3.6~3.8%, silicon content 2.0~3.0%, manganese, phosphorus, sulfur containing not more than 1.5% and appropriate amount of rare earth, magnesium and other spherical agents.
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