ings' target='_blank'>precision casting of grey processing the raw materials used by grey iron as one of the more commonly used raw materials, refers to has the flake graphite cast iron
, mainly iron, carbon, silicon, manganese, sulfur, phosphorus, output accounts for more than 80 of the total iron.
Made of grey group: gray iron machined part of carbon content is higher, about 2.
4%, grey iron is carbon steel substrate with flake graphite, according to the matrix organization of different gray iron can be divided into three categories, respectively is a ferrite pearlite matrix gray cast iron, grey cast iron pearlite matrix, ferrite matrix of gray cast iron.
Dongguan precision casting of grey iron mechanical properties: the mechanical properties of grey iron machined part related to matrix organization and graphite morphology.
Grey iron flake graphite in the fragmentation of the matrix is serious, easy cause stress concentration on the graphite Angle, the tensile strength of gray cast iron, plasticity and toughness is far lower than the steel, but the compressive strength of steel and its mechanical properties is also commonly used in cast iron cast iron with the worst.
At the same time, the mechanical properties of gray cast iron substrate has a certain influence, ferritic matrix of gray cast iron graphite flake is bulky, strength and hardness of the lowest, so the application is less;
Pearlitic matrix of gray cast iron graphite tiny, have higher strength and hardness, is mainly used to manufacture the casting more important;
A ferrite pearlite matrix of gray cast iron graphite flake is pearlite grey cast iron is a bit thick, performance is better than pearlitic gray cast iron.
Dongguan precision casting industry is more use of pearlite matrix of grey iron machined part.
Other properties of gray cast iron;
Grey iron machined part has good castability, good shock resistance, abrasion resistance corrosion resistance, is a kind of commonly used hardware.
Heat treatment method of grey iron machined part: 1, stress relief annealing.
2, improve cutting processability annealing.
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