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Alloy Family Index

Monel Alloys: Grades, Properties & Applications

Monel is a family of nickel-copper alloys known for outstanding resistance to seawater, hydrofluoric acid and alkaline solutions.

Quick Answer

What are Monel alloys?

Monel is a family of nickel-copper alloys known for outstanding resistance to seawater, hydrofluoric acid and alkaline solutions. This index lists 8 technical articles covering composition, mechanical properties, temperature limits, corrosion behaviour and welding practice for each grade.

What is Monel?

Monel is a family of nickel-copper alloys known for outstanding resistance to seawater, hydrofluoric acid and alkaline solutions. Hangbo Alloy Group stocks and supplies these grades in round bar, seamless tube, plate, sheet, precision strip, forging, wire and machined-part forms, with mill test certificates to EN 10204 3.1 / 3.2.

Which Monel grades are covered?

GradeUNSTypeSummary
Monel 400: Properties, Temperature Limits & Marine ApplicationsUNS N04400Grade guideComplete technical guide to Monel 400 (UNS N04400 / W.Nr. 2.4360). Chemical composition, mechanical properties, corrosion resistance in seawater.
Monel K-500: High Strength & Marine Shafting ApplicationsUNS N05500Grade guideComplete technical guide to Monel K-500 (UNS N05500 / W.Nr. 2.4375). Chemical composition, mechanical properties, precipitation hardening.
Monel R-405: Free-Machining Nickel-Copper Alloy & Marine ApplicationsUNS N04405Grade guideComplete technical guide to Monel R-405 (UNS N04405 / W.Nr. 2.4361). The free-machining version of Monel 400 with enhanced sulfur content for...
Monel 400 vs Copper-Nickel 70/30 for Seawater Piping: Cost, Velocity & LifeUNS N04400ComparisonMonel 400 vs copper-nickel 70/30 for seawater: composition, velocity limits, strength, cost and a selection table to choose the right UNS and ASTM...
Monel 400 vs Monel 404: When Low Impurity MattersUNS N04400ComparisonMonel 400 vs Monel 404: same nickel-copper base, tighter iron/manganese/silicon limits on 404 for brazing and electronic parts. How to choose and...
Monel 400 vs Monel K-500: Which to ChooseUNS N04400ComparisonMonel 400 vs Monel K-500: when each fits shafting, fasteners, valves. Compare strength, age-hardening, corrosion, galling, welding & K-500 ageing...
Monel 60 (ENiCu-2 / RMonel 60) Welding Consumable: Nickel-Copper Electrode & Wire for Monel 400/K-500UNS N04060Filler metalComplete technical guide to Monel 60 / ENiCu-2 (UNS N04060 / AWS A5.11) nickel-copper welding electrode and wire.
Monel 60 (ERNiCu-7) Welding Wire GuideUNS N04060Filler metalTechnical guide to Monel 60 (ERNiCu-7 / UNS N04060) welding wire. Composition, welding parameters, applications, and specifications.

Which product forms are available?

Round bars · Seamless tubes · Plates & sheets · Precision strips · Forgings & rings · Welding wire. Not every grade is stocked in every form — cast superalloys, for example, are supplied as master alloy ingots and investment castings rather than wrought bar. Contact us for current stock and size ranges.

Which standards apply?

Supplied to ASTM, ASME, AMS, DIN/W.Nr., EN, GB and GOST specifications. The individual grade articles list the applicable standard numbers for each product form.

Frequently asked questions about Monel

What is Monel?

Monel is a family of nickel-copper alloys (typically about 63-70% nickel) with excellent resistance to seawater, hydrofluoric acid and caustic solutions.

What is the difference between Monel 400 and Monel K-500?

Monel K-500 adds aluminium and titanium for precipitation hardening, roughly doubling the strength of Monel 400 while retaining similar corrosion resistance.

Is Monel good for seawater?

Yes. Monel 400 is a standard material for seawater pump shafts, valve trim and high-velocity marine service, alongside copper-nickel 70/30 for piping.

What is Monel R-405?

Monel R-405 is the free-machining variant of Monel 400 with controlled sulphur for improved screw-machine productivity.

Can Monel be welded?

Yes, typically with ENiCu-7 / ERNiCu-7 filler metal (AWS A5.14) and clean joint preparation to avoid porosity.

Other alloy families

Inconel · Hastelloy · Incoloy · Pure Nickel · Copper-Nickel · Cast Superalloys — see the full family index.

Need Monel material?

Send your grade, specification, dimensions and quantity for a quotation. WhatsApp +86 13611656360 or email hangbo@nickel-alloy.com.

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