Changsha stainless steel precision casting, porosity of preventive measures

by:XEX     2020-11-02
Stainless steel precision castings' target='_blank'>casting porosity prevention 1, for complex thin wall castings, in order to improve the modelling of stainless steel precision casting shell permeability, where possible, set on high to vent. Setting up reasonable pouring system and prevent casting gas volume, and is advantageous to the discharge gas in the cavity. 2, properly increasing pouring temperature, try to reduce the ladle nozzle distance to the sprue cup, reduce the pouring speed, make the liquid metal filling smooth, prevent into gas, and liquid metal in the cavity gas energy discharge smoothly. 3, lost wax pattern material should be ruled out clean, residual modulus material should be as little as possible. 4, shell roasting to fully, should have a high enough temperature; Silica sol and ethyl silicate shell from 950 to 1100 degrees Celsius, sodium silicate shell from 850 to 900 degrees Celsius; Holding time is greater than & amp; , to ensure that the stainless steel precision casting modelling to shell roasting, gas forming material fully ruled out. Roasting completely shell is white or light gray, should not have black patches. https://www. xexfoundry。 com/
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