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To supply qualified investment castings to customers, inspection is a very important process after the castings completed. This will help to avoid costs that might be caused by scraps after castings received by customers.
Carbon steel could be divided according to different carbon content:C≤0.20%-low carbon steel investment castings;C:0.2~0.5%- medium carbon steel;C≥0.5%-high carbon steel.Steel investment castings.Cast steel according to the chemical composition is divided into:carbon steel investment castings and alloy steel investment casting.Now we would like to analyse the characteristics of low ally steel investment castings,special steel investment castings and carbon steel investment castings.
The quality of investment castings raw material will have a great effect on investment casting quality.It is uncertain that choosing super material will improve production costs of investment castings.
Common defects of investment castings include dross and inclusions, blowholes, shrinkage porosity, shrinkage cracks, cold shuts, hot cracking/hot tearing/hot shortness, miss runs,etc. Such defects will affect the surface roughness and also the strength of the castings. So, all foundries pay lots of costs and time to solve such investment casting defects.
Tongda precision casting focuses on the techniques of silica sol, water glass，shell mould and lost-foam castings. The materials we are dealing with are stainless steel, carbon steel, alloy steel, ductile iron, grey iron and so on. Our OEM products are widely used in the industries of Automobiles.G.E.T., Forklifts, Marines and Railways.
Cast iron is iron carbon alloy which carbon content is greater than 2%.Carbon exist in cast iron mostly as graphite morphology,sometimes as cementite.In addition to carbon,also contains 1%~3% of silicon in cast iron,and manganese,phosphorus,sulfur and other elements.
