steel investment castingsteel investment casting is utilized when complex detail,undercuts or non-machinable features and accurate parts are required.
steel investment casting typically requires significant lead time,are best suited for low volume production rates.
steel investment casting can meet the tight casting tolerance and good smooth surface.
steel investment casting is including four different process:
sodium silicate shell process
complex shell process
soluble glass process
lost wax process
Sodium silicate shell process is the best one which suitable the smaller parts,the tolerance can achieve at CT4~CT5 Grade
Surface qualityN 1 N 2 N 3 N 4 N 5 N 6 N 7 N 8 N 9 N 10 N 11 N 12 Microns 0.025 0.05 0.1 0.2 0.4 0.8 1.6 3.2 6.3 12.5 25 50 Micro-Inch 1 2 4 8 16 32 63 125 250 500 1000 2000 
SS304 with investment casting 
stainless steel&brass 
carbon steel with machining