Year1
- 规格：
- 齐全
- 商标：
- 翔云
- 用途：
- 广泛
Introduction to gray cast iron
Structure and properties of gray cast iron
Structure of gray cast iron
Gray cast iron can be regarded as a gray cast iron matrix of carbon steel plus flake graphite. Gray cast iron is divided into three categories according to different matrix structures: ferrite matrix gray cast iron ferrite-pearlite matrix gray cast iron pearlite matrix gray cast iron.
Mechanical properties
The mechanical properties of gray cast iron are related to the structure of the matrix and the morphology of graphite. The flake graphite in gray cast iron severely fragments the matrix and easily causes stress concentration at the sharp corners of the graphite. The tensile strength, plasticity and toughness of gray cast iron are much lower than that of steel, but the compressive strength is equivalent to that of steel. It also has the best mechanical properties among commonly used cast iron parts. Poor cast iron. At the same time, the matrix structure also has a certain influence on the mechanical properties of gray cast iron. The graphite flakes of ferrite matrix gray cast iron are coarse and have the lowest strength and hardness, so they are less used. The graphite flakes of pearlite matrix gray cast iron are small and have higher strength and hardness. They are mainly used for The graphite flakes of ferrite-pearlitic matrix gray cast iron, which is the most important casting to make, are slightly larger than those of pearlitic gray cast iron, but their performance is not as good as that of pearlitic gray cast iron. Therefore, gray cast iron with pearlite matrix is more commonly used in industry.
Other properties
Good casting performance, good vibration damping, good wear resistance, good cutting performance, low notch sensitivity.
Heat treatment of gray cast iron
Annealing to remove internal stress
Annealing to improve machinability
Surface quenching
Density of gray cast iron
Sorting of gray cast iron
The densities are respectively and.
The melting point of gray cast iron is degrees Celsius
Gray cast iron manufacturing steps
(1) Strict requirements for chemical composition. The carbon and silicon content required for the raw iron liquid is higher than that of gray cast iron. Reduce the content of manganese, phosphorus and sulfur in ductile iron. Content
(2) The discharge temperature of the molten iron is higher than that of gray cast iron to compensate for the loss of molten iron temperature during the spheroidization inoculation process
(3) Nodulizing treatment is to add a spheroidizing agent to the molten iron
br/> (4) Add inoculants for inoculation treatment
(5) Gray cast iron has poor fluidity and large shrinkage, so it requires a higher pouring temperature and a larger pouring system size. Reasonable application of riser chilled iron in the order Solidification Principle
(6) Heat Treatment
Dongguan Xiangyun Metal Materials Co., Ltd. mainly deals in ductile iron
Gray cast iron
and other metal materials
Ductile Iron< br/>Nodular cast iron is obtained through spheroidization and inoculation treatment to obtain spherical graphite. Ductile iron effectively improves the mechanical properties of ductile iron, especially the plasticity and toughness of ductile iron, thereby obtaining a higher strength of ductile iron than carbon steel. Ductile iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. Based on its excellent performance, it has been successfully used to cast some parts with complex stress requirements, strength, toughness, and wear resistance. Ductile iron has rapidly developed into the most widely used cast iron material after gray cast iron. The so-called substituting iron for steel mainly refers to ductile iron
Gray cast iron
Gray cast iron can be regarded as a gray cast iron matrix of carbon steel plus flake graphite. Gray cast iron is divided into three categories according to different matrix structures: ferrite matrix gray cast iron ferrite-pearlite matrix gray cast iron pearlite matrix gray cast iron.
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