Weapons handling and launch gear works in salt spray and intermittent immersion, carries high loads, and has moving parts that must not gall or seize. On many platforms it also has to keep its magnetic signature low. Grade selection has to satisfy several of those at once, which is why naval copper alloys feature heavily.
Hiduron® 191 is specified for weapons handling equipment, along with hose couplings, gears and winch components, valued for its seawater corrosion resistance, freedom from hydrogen embrittlement and excellent anti-galling behaviour. Where two surfaces run against each other, Fermonic® 60 is the anti-galling grade, specified for its ability to run against stainless steel without seizing.
For high strength wetted structure, the super duplex grades Ferralium® 255, Alloy 32760 and Alloy 32750 clear a PREN above 40. And Fermonic® 50 provides a non-magnetic high strength option. Hiduron® 130 covers seawater valves and fittings within the assembly.
Hiduron® 191 is a naval cupronickel meeting DEF STAN 02-835 and NES 835. Fermonic® 50 and Fermonic® 60 are UNS S20910 and S21800, known elsewhere as Nitronic® 50 and Nitronic 60 (Cleveland-Cliffs). Ferralium® 255 is UNS S32550; Alloy 32760 is UNS S32760 (Zeron 100®, Rolled Alloys); Alloy 32750 is UNS S32750 (SAF 2507®, Alleima).