Gravity and low‑pressure die casting gently fill molten aluminum into steel dies using natural flow or low applied pressure. Controlled filling, durable tooling, and slow solidification produce strong, low‑porosity parts for wheels, housings, and structural components.
Gravity and low‑pressure die casting are robust processes for producing high‑quality aluminum components with good mechanical properties. In gravity die casting, molten alloy is poured into a preheated steel mold, relying on natural flow for gentle filling with minimal turbulence. Low‑pressure die casting uses a sealed furnace and regulated pressure—typically around 0.5–1 bar—to push molten metal upward through a riser tube into the die, ensuring highly controlled filling and reduced oxide inclusion. Tooling consists of durable steel dies, usually made of Hot work Tool Steels, with engineered gating, venting, and cooling systems to manage heat flow and solidification, often supported by die coatings to improve release and extend tool life. Commonly processed materials include Al‑Si and Al‑Mg alloys selected for castability, strength, and corrosion resistance. These processes are widely used for structural and safety‑critical parts such as wheels, suspension components, housings, and engine or drivetrain casings, where low porosity and dimensional stability are essential.