Marine Alloys
Marine environments pose significant challenges to the lifetime of metals, with multiple forms of corrosion and failure possible. Seawater acts as an efficient electrolyte that facilitates the electrochemical reactions of corrosion, with chloride ions accelerating the process, particularly in the presence of dissolved oxygen.
Other factors, such as water flow rate, local pollution, and microbiological activity, can also influence corrosion. Understanding these mechanisms is essential for selecting alloys best suited to specific marine conditions.
Engineered for the rigors of saltwater and offshore operations, our marine grade alloys deliver exceptional corrosion resistance, strength, and durability. They are suitable for a wide range of marine applications, such as fasteners, propeller shafts, submarine components, offshore structures, and other critical equipment.
Super Duplex Stainless Steels
Ferralium 255 (S32550)
Typical Marine Applications: Seawater piping, heat exchangers, propeller shafts, pumps, valves, offshore oil and gas platforms, desalination plants, submarine components.
Key Features: Excellent pitting and crevice corrosion resistance in chloride environments, high strength.
S32760 (Zeron 100)
Typical Marine Applications: Offshore drilling equipment, subsea components, seawater handling systems, ballast water systems, marine fasteners, propeller shafts in highly corrosive conditions.
Key Features: Exceptional corrosion resistance, particularly in aggressive seawater environments, with high mechanical strength.
S32750 / UNS 2507 (SAF 2507)
Typical Marine Applications: Shipboard piping, seawater cooling systems, offshore platform components, marine pumps and valves, chemical tankers, heat exchangers, subsea equipment, marine exhaust systems, propeller hardware.
Key Features: Outstanding resistance to pitting, crevice, and stress corrosion in chloride-rich marine environments, very high strength.
Duplex Stainless Steel
2205 (S31803/S32205)
Typical Marine Applications: Ship tanks, marine architectural components, cargo tanks for chemical tankers, ballast tanks, offshore platforms, desalination equipment.
Key Features: Balanced corrosion resistance and strength, suitable for moderate to aggressive seawater exposure.
Nickel-Copper Alloys
Alloy K500 (Monel K500)
Typical Marine Applications: Propeller shafts, pump shafts, marine fasteners, valve trim, oil well drill collars, subsea cables and components.
Key Features: High strength, excellent resistance to seawater and biofouling, good wear properties.
Hiduron 130 (Copper-Nickel 90/10)
Typical Marine Applications: Seawater piping, condenser tubes, heat exchangers, shipboard plumbing, desalination plants, offshore platforms.
Key Features: Excellent resistance to seawater corrosion and biofouling, easy fabrication.
Hiduron 191 (Copper-Nickel 70/30)
Typical Marine Applications: Marine condenser tubes, seawater piping systems, ship hull cladding, offshore oil and gas equipment, heat exchangers in aggressive seawater.
Key Features: Very high corrosion resistance in aggressive seawater, good mechanical properties.
Hidurel 5 (Aluminium Bronze)
Typical Marine Applications: Propellers, propeller blades, pump impellers, valve components, marine bearings, ship fittings, subsea tooling.
Key Features: Excellent wear resistance and corrosion resistance in seawater, high strength for moving parts.
Nickel Alloys
Alloy 625 (Inconel 625)
Typical Marine Applications: Offshore platform components, subsea equipment, marine exhaust systems, high-temperature seawater handling, propulsion systems.
Key Features: Outstanding resistance to pitting, crevice, and stress corrosion cracking, retains strength at elevated temperatures.
Alloy 825 (Incoloy 825)
Typical Marine Applications: Seawater cooling systems, marine scrubbers, offshore chemical processing equipment, sour gas applications.
Key Features: Excellent resistance to acid attack, stress corrosion cracking, and seawater corrosion.
Austenitic Stainless Steel
316L
Typical Marine Applications: Marine architectural hardware, boat fittings, railings, deck hardware, galley equipment (limited in continuous high-chloride immersion).
Key Features: Good corrosion resistance in mild marine environments, widely available and cost-effective.
254 SMO (S31254)
Typical Marine Applications: Seawater desalination plants, marine heat exchangers, offshore platform piping, seawater pumps, chemical tankers.
Key Features: Extremely high resistance to pitting and crevice corrosion in chloride-rich environments, strong and durable.
For detailed specifications, comparisons, or custom solutions, please contact our Technical Team
for expert guidance, or our Sales Team for quotations.
