The necessary steps of investment casting method are:
1. Production of heat-disposable wax, plastic, or polystyrene patterns.
2. Assembly of these patterns onto a gating system.
3. Investing or covering pattern assembly by refractory slurry.
4. Melting pattern assembly to take away the pattern material.
5. Firing the mold to remove last traces of pattern material.
7. Knockout, cutoff and finishing.