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Grey iron castings
The basic characteristics of gray iron casting are: high clay content, low water content, low coal powder addition.
Clay content and mud content. Molding sand with high clay content also increases in strength with increasing specific pressure, and effective bentonite is usually controlled at 7% to 10%. The sum of effective clay and dead clay in molding sand is equivalent to mud content, which is generally controlled from 12% to 16%. Too high or too low mud content will affect the performance of sand.
The moisture. The water content in moulding sand is the main factor that determines the plasticity and cohesive force of clay. When the water is too high, the cohesive force of clay will deteriorate, and the fluidity of molding sand will decrease. When the water is too low, the molding sand is not easy to be mixed, the strength of the molding sand is low, the brittleness is high, the mould initiation is poor, and the casting is prone to clay sand defects. The general moisture content should be controlled at 10% to 20% higher than when the peak wet pressure strength is obtained.
Raw sand grain size. When high density modelling, sand density is higher, when pouring, expand big, because this original sand grain degree should not be too concentrated, original sand grain assumes circular or polygon shape, choose commonly 3 sieve sand or 4 sieve sand.
Methods to increase the tensile strength of gray iron casting:
A small amount of carbon can be added to the raw materials. In gray iron casting, the carbon content is mostly 2.6% ~ 3.6%, and silicon content is 1.2% ~ 33.0%. When the wall thickness of gray iron casting is determined, manganese should be added appropriately, and the content of manganese should be.4% ~
Alloying method is used to improve tensile strength for castings, adding suitable amount of trace alloy, chromium, molybdenum, tin and other elements can significantly improve the tensile strength of castings, and inoculation of molten iron.
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Grey iron castings