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The difference between nodular cast iron and cast iron

by:BoQiao Machinery     2020-11-26
Ductile iron is short for nodular cast iron, nodular cast iron is a kind of cast iron cast iron carbon content in more than 2% of the iron carbon alloy. Industrial iron carbon content is 2% ~ 4% in general. Many of carbon in cast iron graphite morphology exist, sometimes also with cementite. In addition to carbon, also contains 1% ~ 3% of silicon in cast iron, and manganese, phosphorus, sulfur and other elements. Also contain nickel, chromium, molybdenum alloy cast iron, aluminum, copper, boron, vanadium and other elements. Carbon, silicon, are main elements affect the microstructure and properties of cast iron. Cast iron can be divided into: (1) of grey cast iron. Carbon content is higher, 2. 7% ~ 4. 0%) , carbon mainly exist in flake graphite morphology, fracture surface brown or grey. Low melting point ( 1145~1250℃) Small, solidification shrinkage, compressive strength and hardness is close to carbon steel, good shock absorption. Used in the manufacture of machine tool bed, cylinder, enclosure structure, etc. (2) white cast iron. Low content of carbon, silicon, carbon mainly cementite form, fracture in silver. Solidification shrinkage when big, easy to produce shrinkage cavity and crack. High hardness, brittleness, unable to bear impact load. Much as malleable iron ware and wear resistance parts. (3) malleable iron. By white cast iron after annealing treatment, graphite flocculent mass distribution, hereinafter referred to as ductile iron. Uniform its organizational performance, wear resistance, good plasticity and toughness. Used in the manufacture of complex shape parts, can withstand the strong dynamic load. (4) nodular cast iron. The grey cast iron molten iron after spheroidizing treatment, precipitation of graphite spheres, hereinafter referred to as ductile iron. Than ordinary grey cast iron has high strength, good toughness and plasticity. Used in the manufacture of internal combustion engine, auto parts and agricultural machinery. (5) vermicular cast iron. The grey cast iron molten iron after injection vermicularizing treatment, precipitation of graphite vermicular. Mechanical properties similar to ductile iron, casting performance between grey cast iron and nodular cast iron. Used in the manufacture of auto parts. 6. Alloy cast iron. Ordinary cast iron adding suitable amount of alloy elements ( Such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc. ) To obtain. Alloying elements make the cast iron matrix was changed, which has the corresponding heat resistant, wear resistant, corrosion resistant, low temperature or without magnetic resistance and other properties. Used in the manufacture of mining, chemical machinery and instruments, meters and other parts.
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