There are several methods practiced to cast different martials of turbo turbine housings.
Advantage of investment casted stainless steel turbine housing (also called “lost wax casting”) is that: since it’s a precision casting process, the size is accurate and the surface is smooth. High dimensional accuracy and small surface roughness can be achieved. The surface roughness Ra12.5-Ra3.2 can reduce machining allowance.
Comparing to others, Investment casting of stainless steel turbine housing can help reach thin-walled castings, as thin as 0.5mm.
Crack or shake out ceramic shell of stainless steel investment casting of turbine housing
Ceramic shell building and drying for stainless steel turbine housing
Bigger AR stainless steel turbine housing IS38
Face milling stainless steel turbo turbine housing inlet flange