Antimony (Sb) – High-Performance Alloying Element for Iron and Non-Ferrous Foundry Applications

Antimony (Sb) is a versatile metalloid widely used in the foundry industry for its unique ability to modify microstructure and enhance mechanical properties in both ferrous and non-ferrous alloys. Supplied in high-purity ingot or granulated form, it is a valuable additive that improves casting quality, durability, and performance.

In iron foundry applications, Antimony is commonly used in gray and ductile iron production. In gray iron, it promotes pearlite formation, resulting in improved hardness, wear resistance, and dimensional stability—critical properties for engine blocks, brake components, and other wear-prone castings. In heavy-section ductile iron, Antimony plays a key role in refining nodule structure. It slows down graphite nodule growth and helps prevent the formation of exploded nodules, which can compromise casting integrity.

In non-ferrous foundry applications, Antimony is used primarily in copper-based alloys, lead alloys, and tin-based systems. It increases alloy hardness, tensile strength, and corrosion resistance, making it suitable for demanding environments such as marine hardware, plumbing fixtures, and bearing materials. It is also a key component in many low-friction and antifriction alloys, extending the life and reliability of moving parts.

Carpenter Brothers offers Antimony (Sb) in multiple sizes and packaging, including Antimony .250″ & down. Contact us for availability.