What materials are best suited for gravity casting?
What Materials Are Best Suited for Gravity Casting?
Aluminum Alloys
Aluminum remains the most widely used material in gravity casting, favored for its high strength-to-weight ratio, corrosion resistance, and cost efficiency. Alloys such as A356, ADC12, and 319 dominate industrial use:
A356: Heat treatable (T6) to ≥310 MPa tensile strength and ≥110 Brinell hardness. Common in automotive chassis parts, aerospace brackets, and energy system housings.
ADC12: Offers high fluidity, dimensional accuracy, and castability. Used extensively in consumer electronics enclosures and motor housings.
319: Provides better thermal resistance and moderate strength, ideal for engine and transmission parts requiring 150–200 MPa tensile strength with good machinability.
Copper Alloys
Copper-based alloys offer exceptional thermal and electrical conductivity. Their durability and corrosion resistance make them well-suited for harsh environments, such as telecommunication systems and marine hardware.
Silicon Bronze (C87500): Balances strength (≥350 MPa) and corrosion resistance; suitable for plumbing and architectural hardware.
Red Brass (C83600): Exhibits excellent pressure-tightness and is widely used in pump and valve bodies.
Zinc Alloys
Zinc-based alloys like ZA-12 and ZA-27 are applied in medium-load, dimensionally stable parts. Although less common in gravity casting due to lower melting points (~380 °C), they’re cost-effective for high-wear components where tight tolerances are essential.
Magnesium Alloys (Limited Use)
Magnesium’s low density (1.74 g/cm³) offers significant weight savings for aerospace and EV markets. However, oxidation risks and higher safety requirements limit its use. Current research focuses on safer alloy formulations for broader adoption.
Manufacturing Services for Gravity Cast Metal Alloys
Neway offers comprehensive gravity casting solutions using aluminum, copper, and specialty alloys. Our capabilities include CNC finishing, mold design, and heat treatment. With ±0.01 mm precision, over 20 years of experience, and global logistics, we deliver durable, high-performance parts for demanding industries.
