why the surface has a layer of acid can not afford to remove the black leather? Some are light
General requirements of the 304 stainless steel valve shell casting, can be used paraffin wax, stearic acid and water glass mullite process can be solvedIf the surface requirement is high, it is recommended to use medium high temperature mold + silica sol zircon sand processIt's a black oxide scale.
General requirements of the 304 stainless steel valve shell casting, can be used paraffin wax, stearic acid and water glass mullite process can be solvedIf the surface requirement is high, it is recommended to use medium high temperature mold + silica sol zircon sand processIt's a black oxide scale.
General requirements of the 304 stainless steel valve shell casting, can be used paraffin wax, stearic acid and water glass mullite process can be solvedIf the surface requirement is high, it is recommended to use medium high temperature mold + silica sol zircon sand processIt's a black oxide scale.
