Alloys by application

For valves in seawater and chloride service, super duplex Ferralium^® 255, Alloy 32750 and 32760 give a PREN above 40 with high strength; sour service moves to Alloy 718 and 725, acid to Alloy 625 and 825.

Super duplex is the usual pump-shaft choice, combining a minimum 80 ksi yield with a PREN above 40 for a smaller shaft. Fermonic^® 50 suits non-magnetic shafts; Hiduron^® 130 suits seawater and firewater.

Super duplex (Ferralium^® 255, Alloy 32750, Alloy 32760) suits chloride and seawater flange duty at a PREN above 40, with duplex 2205 for general pressure, nickel Alloy 625 and 825 for acids, and Alloy 718 and 725 for high-strength sour service. We supply the bar and plate flanges are machined from.

Super duplex (Ferralium^® 255, Alloy 32750, Alloy 32760) and duplex 2205 cover most pressure-containing fitting duty at a PREN above 40, with nickel Alloy 625 and 825 for aggressive acids and Alloy 718 and 725 where high strength is required. We supply the bar and plate fittings are machined from.

We supply bar to fastener manufacturers and specialist bolting houses across the super duplex, nickel and naval ranges, from general chloride service to subsea bolting without cathodic protection, where a PREN above 40 is the accepted threshold.

For springs needing high strength with corrosion resistance, Fermonic^® 50 (a work-hardening, non-magnetic nitrogen-strengthened austenitic) and the age-hardening nickel alloys 718 and 725 are the usual choices, with 17-4 PH for general high-strength duty and Alloy K-500 where marine corrosion resistance is also needed.

For pump and propeller shafts in seawater, super duplex (Ferralium^® 255, Alloy 32750, Alloy 32760) combines high yield with a PREN above 40. Fermonic^® 50 for non-magnetic shafts; Alloy 718 and 725 for sour high-strength duty; Hiduron^® 130 for anti-fouling and crevice resistance.

For bushings, bearings and wear components, the high-strength copper alloys Hidurel^® 5 and Hiduron^® 130 lead on anti-friction and seawater performance, with anti-galling Fermonic^® 60 where metal-to-metal contact is the failure mode and Alloy 316L hollow bar for sleeves and spacers.

For heat-exchanger tubesheets, baffles and pressure parts, duplex 2205 and super duplex resist pitting and stress-corrosion cracking at high strength, nickel Alloy 825 and 625 handle aggressive acids, and Alloy 316L covers milder duty. Seawater-cooled units use the cupronickel Hiduron^® 130 for anti-fouling and crevice resistance.

For sour, high-pressure, high-chloride downhole tools, the age-hardening nickel alloys 718, 725 and 925 give high strength and sulphide-stress-cracking resistance to NACE MR0175, plus super duplex and non-magnetic Fermonic^® 50 where needed.

For wellhead and subsea equipment, bodies, valves, hangers and connectors, super duplex gives a PREN above 40 with high strength for seawater and production service, while the age-hardening nickel alloys 718, 725 and 925 cover high-strength sour duty to NACE MR0175 and API 6A / 6ACRA.

For marine propulsion in seawater, shafts, propellers, rudders and running gear, the high-strength cupronickels Hiduron^® 130 and 191 combine seawater and anti-fouling resistance with high strength and low magnetic permeability, alongside Alloy K-500, super duplex Ferralium^® 255 for propellers and rudders, and Fermonic^® 50 and Hidurel^® 5 for shafting.

For seawater cooling, firewater and ballast systems, the wetted components have to resist chloride pitting, crevice corrosion and erosion for the design life of the vessel or platform. Super duplex stainless steels with a PREN above 40 and the copper alloy Hiduron^® 130 are the usual choices, with nickel alloys where the service turns acid.

Where magnetic signature matters - naval sensors, sonar, mine countermeasures and instrumentation - the component has to combine structural strength with very low magnetic permeability. Fermonic^® 50 stays fully non-magnetic even after severe cold work, and the copper alloys Hiduron^® 130 and Hidurel^® 5 add seawater corrosion resistance where the part is also wetted.

Fasteners for surface fleet and submarine service face seawater, crevice corrosion in the thread root and, in cathodically protected assemblies, hydrogen. The copper alloys Hiduron^® 191 and Hiduron^® 130 are specified for naval bolting for their seawater resistance, anti-galling behaviour and freedom from hydrogen embrittlement, with super duplex where a higher PREN with high strength is required.

Sonar transducers, hull sensors and instrumentation housings combine seawater exposure with a hard limit on magnetic signature. Hiduron^® 191 and Hiduron^® 130 give seawater corrosion resistance with very low magnetic permeability, and Fermonic^® 50 provides a non-magnetic structural grade for sensor fixtures and fittings.

Weapons handling and launch equipment on naval vessels needs seawater corrosion resistance, high strength, anti-galling behaviour on moving parts and, in many cases, a low magnetic signature. Hiduron^® 191 is specified for weapons handling equipment, with super duplex and Fermonic^® grades for structural and moving components.

Subsea and naval hydraulic and electrical connectors, including flying lead connectors for stab plates, have to resist seawater and crevice corrosion, carry load and, in naval service, keep magnetic signature low. Hiduron^® 130 is the established choice, with super duplex where higher strength is needed and Hidurel^® 5 for the bearing and sealing parts.

Deck machinery, winches, tow and mooring fittings live in salt spray and intermittent immersion under high load. Hiduron^® 130 is used for naval winches and tow and winch fittings, Hidurel^® 5 for heavily loaded bearing and winch components, and Alloy 316L for general deck hardware in sheltered exposure.