Marine Nickel Alloy Scrap
Source industry
Ships and offshore vessels use Monel 400 and K-500, super duplex, 254 SMO and Ni-Resist for seawater systems, shafts and pumps. Ship recycling and refits release this material, often mixed with copper alloys and stainless steel.
Background
Why Marine and Shipbuilding Uses Nickel Alloys
Seawater corrodes most metals, especially in fast-flowing pumps and at propeller shafts. Nickel-copper Monel, super duplex and Ni-Resist castings are chosen because they resist seawater pitting and erosion.
Scrap comes from ship recycling, dry-dock refits and replacement of pumps, valves and shafts.
The chain
From Component to Scrap
Where the alloy served, which grades are used there, and the scrap that comes back.
Monel K-500
Solids and bar
Monel 400, Ni-Resist Type 1, super duplex
Castings and solids
Super duplex 2507 and S32760, 254 SMO
Pipe and fittings
Inconel 625, Inconel 713C
Sheet and cast wheels
Grades
Grades from This Industry
Open a grade for its composition, identification and standards.
| Grade | Typical use in this industry |
|---|---|
| Monel 400 | Marine fittings, seawater valves and pumps |
| Monel K-500 | Pump and propeller shafts |
| Super duplex S32760 | Seawater and firewater systems |
| 254 SMO | Seawater cooling and firewater systems |
| Ni-Resist Type 1 | Pump casings and impellers |
Standards
Standards Behind This Scrap
Seawater systems use Monel, 625, duplex and 254 SMO made to ASTM specifications: B127 and B164 for Monel 400, B865 for K-500, A790 for duplex pipe and A240 for plate. US naval supply also uses federal specifications such as QQ-N-281 for Monel 400 and QQ-N-286 for K-500.
Before you sell
Things to Know
Marine scrap is often mixed with cupronickel and bronze, which are copper-base alloys and must be kept out of nickel alloy lots.
Questions
FAQ
Is cupronickel from ships a nickel alloy?
No. 90/10 and 70/30 cupronickels are copper-base and are sold as copper alloy scrap.
How is marine nickel alloy scrap separated from bronze?
By XRF. Bronze and cupronickel are copper-base, while Monel is nickel-base; the analyser separates them in seconds.
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