The liquid metal is forced into a mold under pressure and at a relatively high velocity and allowed to solidify with the pressure maintained. A two-piece permanent steel mold or die is employed; when clamped together, the two pieces form the desired shape.

• A. It uses a wax pattern
• B. It uses a two-piece permanent steel mold and pressure
• C. It uses lost foam
• D. It uses sand as the mold

Answer: (B)

The situation describes die casting: molten metal is injected into a steel mold that consists of two halves and is clamped together, with high injection speed and pressure maintained as the metal solidifies. This use of a permanent steel mold and continuous pressure during solidification yields precise shapes and good surface finish, and it’s specifically the hallmark of die casting rather than expendable-mold methods.

Investment casting would use a wax pattern coated and then burned away (lost wax), not a reusable steel die. Lost-foam uses a foam pattern and a different mold setup, not a two-piece steel die. Sand casting relies on a sand mold around a pattern, which is not a permanent steel die and typically involves lower pressures and looser tolerances.