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Monel — Steel Products by Mailong Metal

Monel

Monel Alloys—The Marine-Grade Nickel-Copper Solution

Monel 400 and K500 offer outstanding resistance to seawater, acids, alkalis, and pressure. Ideal for shipbuilding, chemical processing, oil tools, valves, and heat exchangers.

Monel product form and shape variant 1Monel product form and shape variant 2Monel product form and shape variant 3
Monel 400 Strip
Monel 400 Strip
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Monel K500 Sheet
Monel K500 Sheet
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Monel R405 Bar
Monel R405 Bar
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What Is Monel?

Monel 400 – 67% Ni + 30% Cu, excellent seawater & acid resistance
Monel K500 – Precipitation-hardened version of Monel 400 with higher strength & hardness

Monel® is a trademarked family of nickel-copper alloys known for their exceptional resistance to seawater and chemical corrosion, along with good mechanical strength and toughness.

The most used grades include:

Monel 400 – 67% Ni + 30% Cu, excellent seawater & acid resistance

Monel K500 – Precipitation-hardened version of Monel 400 with higher strength & hardness

Core Properties

  • ✔Superior resistance to saltwater, hydrofluoric acid, and sulfuric acid
  • ✔High strength and toughness, even at sub-zero temperatures
  • ✔Maintains performance under high pressure and thermal stress
  • ✔Excellent machinability, weldability, and fatigue resistance

Optional Monel Alloys Specifications

Monel 400 (UNS N04400), Monel K500 (UNS N05500)

PropertyDetails
Forms AvailableSheet, plate, pipe, tube, round bar, wire, flange, fittings
GradesMonel 400 (UNS N04400), Monel K500 (UNS N05500)
StandardASTM B127 (sheet), B165 (pipe), B164 (bar), B366/B564 (fittings)
Plate Thickness1mm – 80mm
Bar SizeØ6mm – Ø300mm
Pipe Sizes1/2" – 12" NPS, SCH 10–XXS
ConditionAnnealed, hot forged, cold drawn, hardened & tempered
CertificationsASTM, EN10204 3.1/3.2, NACE MR0175, ISO, TUV
Applications
  • Chemical processing: reactors, heat exchangers, scrubbers
  • Waste treatment and desulfurization (FGD) systems
  • Pharmaceutical and biotech plants
  • Pulp & paper bleaching systems
  • Offshore & marine environments
  • Pickling line equipment and fertilizer plants
Applications industrial application

Processing & Packaging

Water jet, plasma or laser cutting

Water jet, plasma or laser cutting

Pipe threading, grooving, welding (GTAW)

Pipe threading, grooving, welding (GTAW)

Surface pickling, brushing, mirror polishing

Surface pickling, brushing, mirror polishing

Wood box packaging with desiccant

Wood box packaging with desiccant

ID barcode, heat number, test report per bundle or coil

ID barcode, heat number, test report per bundle or coil

Why Buy From mailongmetals?
  • Full stock of Monel 400/K500 pipe, sheet, bar & wire
  • Cut-to-length, threading, CNC machining service
  • Weldability guidance + filler suggestions (e.g., ERNiCu-7)
  • Precision forging + solution annealing available
  • Corrosion simulation & technical support
  • Global supply network with fast dispatch
Why Buy From mailongmetals? product showcase 1Why Buy From mailongmetals? product showcase 2Why Buy From mailongmetals? product showcase 3Why Buy From mailongmetals? product showcase 4Why Buy From mailongmetals? product showcase 5
Frequently Asked Questions
1. What is Monel alloy?+
Monel is a family of nickel-copper alloys (approximately 67% Ni, 30% Cu) known for exceptional resistance to seawater, acids, and alkalis, combined with high mechanical strength and toughness.
2. What industries commonly use Monel alloys?+
They are widely used in marine engineering, shipbuilding, chemical processing, oil and gas extraction, desalination plants, valve manufacturing, and heat exchanger systems.
3. What is the difference between Monel 400 and Monel K500?+
Monel 400 is the standard grade with excellent corrosion resistance. Monel K500 is a precipitation-hardened version with significantly higher strength and hardness while maintaining similar corrosion resistance.
4. What are the most popular grades of Monel?+
The most common grades are Monel 400 (UNS N04400) and Monel K500 (UNS N05500). Monel R405 is also available for improved machinability.
5. Can Monel alloys withstand seawater corrosion?+
Yes, Monel alloys are among the best materials for seawater service. They offer outstanding resistance to saltwater corrosion, making them ideal for marine and offshore applications.
6. Is Monel resistant to acid corrosion?+
Monel offers excellent resistance to hydrofluoric acid, sulfuric acid, and many alkaline solutions. It is one of the few alloys that can handle hydrofluoric acid at all concentrations.
7. What product forms are available for Monel alloys?+
They are available in sheets, plates, pipes, tubes, round bars, wires, strips, flanges, fittings, and customized machined parts.
8. Can Monel alloys be welded easily?+
Yes. Monel 400 has good weldability using TIG, MIG, or SMAW methods with appropriate filler metals (e.g., ERNiCu-7). K500 requires more careful heat input control.
9. Does Monel work at sub-zero temperatures?+
Yes. Monel alloys maintain excellent toughness and strength at cryogenic temperatures, making them suitable for LNG equipment and cold-weather marine applications.
10. How do I select the right Monel grade for my project?+
Selection depends on the operating environment (seawater, acids, pressure), required strength level, and temperature range. Providing your application details helps engineers recommend the optimal grade.
Let Us Know Your Required Grade

Whether You're Building A Heat Exchanger, Marine Component, Or Chemical Reactor, Mailong Offers Top-Quality Monel Materials With Full Certification And Global Delivery.

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