What is the inspection standard for defects such as porosity and shrinkage cavity of gray cast iron castings?

Pore: round, oval, pear-shaped cavities, most of which have smooth inner walls and different sizes, and are distributed in the casting or near the casting surface in isolation or in groups. (including subcutaneous pores, pinholes, corner thermal throttles, etc. )

Shrinkage hole: a macro hole with irregular shape and rough hole wall formed in the hot spot or final solidification part of the casting.

Depending on the process requirements and customer's requirements for products (affecting the processing of machined surfaces or seals, etc.). )