Ductile iron production considerations - required Nodular cast iron

by:XEX     2020-12-21
Ductile cast iron is through get spheroidal graphite spheroidization and inoculation, effectively improve the mechanical properties of cast iron, especially improve the plasticity and toughness, and the strength is higher than carbon steel. Small make up today to tell you something about ductile iron production needed attention. Nodular cast iron as the axial parts, such as diesel engine crankshaft, connecting rod, high strength and toughness good comprehensive mechanical machinery performance, conditioning treatment was carried out on the cast iron pieces. Production technology of concrete is cast iron is heated to 860 - 900 ℃ of austenitizing temperature thermal insulation for matrix, and then cooling achieve quenching in oil or molten salt, after 500 - 600 ℃ high temperature tempering, obtain tempered sorbite structure, the original spheroidal graphite morphology is constant. After processing strength, toughness good match, adapted to the working conditions of shaft parts. Ductile iron castings production process, or after heat treatment, shot blasting cleaning machine often find some diameter approximately 0, 5 - 3 mm, the shape is spherical or elliptical or pinhole inside sleek holes, these holes are generally 2 - under casting skin Distribution of 3 mm, this is known as subcutaneous blowhole. Ductile iron pieces of subcutaneous blowhole formation is due to a magnesium iron liquid surface tension is big, easy to form the oxide film, the obstacles to precipitate and invasion of gas discharge has a certain influence, these gases in subcutaneous will form the hole. In addition, nodular cast iron paste solidification characteristics make earlier gas channels blocked, will also promote the formation of the subcutaneous blowhole defects. For now, nodular cast iron used in the production of more complex loading, high strength, toughness and wear resistance of parts, such as automobiles, tractors, internal combustion engine crankshaft and camshaft, and general machinery medium-pressure valves and so on. It has been developing rapidly for behind of gray cast iron, cast iron material application is very extensive. That is about the ductile iron production needs attention, hope to be of help. Today small make up to you at this point, let's see you next time.
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