Marine Grade Metals

Aluminum is one of the most widely used metals in marine environments thanks to its excellent corrosion resistance, lightweight strength, and ease of fabrication. Different aluminum alloys are chosen based on where and how the part will be used: 6061 is commonly used for structural components and mounting parts that are not in direct contact with seawater, 6063 is preferred for architectural, trim, and cosmetic applications due to its smooth finish, and 5052 and 5086 are marine-grade alloys designed for continuous exposure to water and are commonly used for hull, stern, and other below- or near-waterline components. In addition, 6063 T-slot extrusions are widely used for bimini tops, frames, and marine covers because they are lightweight, clean-looking, and easy to assemble into custom structures.

Stainless steel is widely used in marine environments for its strength, durability, and corrosion resistance, with different grades selected based on exposure level and performance requirements. 304 stainless steel is commonly used for interior and above-waterline marine components where corrosion exposure is limited, 316 stainless steel is the standard choice for exterior hardware and parts exposed to saltwater due to its superior resistance to chlorides, and 2205 duplex stainless steel is used for highly loaded or continuously exposed components that require exceptional strength and corrosion resistance. Together, these grades cover everything from cosmetic trim and interior fittings to critical marine hardware, fasteners, shafts, and structural components in harsh saltwater environments.

Brass and bronze alloys are commonly used in marine environments for their corrosion resistance, machinability, and durability in wet, salty conditions, with each grade suited to different exposure levels and performance needs. 464 naval brass is designed specifically for marine service and is commonly used for seawater-exposed fittings, fasteners, and hardware due to its excellent corrosion resistance and strength, 280 brass is used for decorative or light-duty exterior components where appearance and moderate corrosion resistance are important, 360 brass is chosen for precision-machined marine parts and fittings that are typically above the waterline, and 385 architectural bronze is used for decorative trim, rails, and hardware where strength, appearance, and weather resistance are desired but continuous seawater immersion is not required.

Bronze alloys are widely used in marine environments for their excellent corrosion resistance, wear resistance, and ability to perform under load in saltwater conditions, with each grade chosen based on strength, bearing performance, and level of exposure to seawater. 655 silicon bronze is commonly used for marine fasteners and general hardware because of its outstanding corrosion resistance and good strength in seawater, 954 aluminum bronze is selected for high-load and wear-resistant marine components exposed to harsh environments, 863 manganese bronze is used for heavy-duty marine hardware and structural fittings that require high strength and toughness, and 907 tin bronze is favored for bearings, bushings, and wear surfaces in marine equipment where low friction and long service life are critical.

Titanium is used in marine environments where extreme corrosion resistance, high strength-to-weight ratio, and long service life are required, especially in saltwater and offshore conditions. Grade 2 titanium (commercially pure) is preferred for continuously seawater-exposed parts, piping, heat exchangers, and hardware where maximum corrosion resistance and formability matter, while Grade 5 titanium (Ti-6Al-4V) is chosen for high-strength marine components, fasteners, shafts, and structural hardware where weight savings and superior mechanical performance are critical.