Monel Alloy 400

  • Seawater resistance & high steam temperatures
  • Excellent stress-corrosion resistance
  • Resistant to hydrofluoric or hydrochloric acids when de-aerated
  • Mild resistance to sulfuric and hydrochloric acids
  • Near-perfect resistance to alkaline and neutral salt
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Description

Overview:

Monel 400 comprises of 67% Nickel and 23% Copper. This alloy flaunts features such as seawater resistance and steams at a high temperature. It is also resistant to caustic and salt solutions. This solid solution required cold working to be hardened.

This Monel metal alloy of copper-nickel also exhibits properties such as high corrosion resistance, high strength, and amazing weldability. When exposed to brackish/seawater combination, this alloy showcases excellent stress-corrosion resistance. It has led to its widescale use in marine applications.

Due to the high amount of copper, this metal Monel alloy is rapidly affected by ammonia and nitric acid systems.

Common Names:

  • UNS NO4400
  • Alloy 400

Executive Standards:

Strip, Plate, and Sheet

  • ASTM B 127
  • ASME SB 127
  • DIN 17750
  • QQ-N-28
  • BS3072NA13
  • BS3073NA13
  • SAE AMS 4544

Pipe & Tube

  • ASTM B 165
  • ASTM B 725
  • ASTM B 775
  • ASME SB 829
  • VdTÜV 263
  • ASTM B 829
  • ASTM B 730
  • ASTM B 751
  • SAE AMS 4574
  • DIN 1775
  • ASME SB 725
  • ASME SB 163
  • ASME SB 165
  • BS3074NA13
  • ASME SB 751
  • ASTM B 163
  • ASME SB 730
  • ASME SB 775

Wire, Rod, Bar, & Forgings

  • ASTM B 164
  • ASTM B 564
  • ASME SB 164
  • ASME SB 564
  • AECMA PrEN 2305
  • BS3075NA13
  • BS3076NA13
  • DIN 17752
  • DIN 17753
  • DIN 17754
  • QQ-N-28
  • SAE AMS 4675
  • SAE AMS 4730
  • SAE AMS 4731
  • VdTÜV 263

Monel 400 Chemical Composition:

CMnSSiNiCuFe
0.30% Max2.00% Max0.024% Max0.50% Max63.0% Max28.0% Max2.50% Max

Monel 400 Mechanical Properties:

Product FormTensile

(KSI)

0.2 Percent Yield (KSI)Elongation

(Percent)

ConditionHardness

(HRB)

Plate70 to 8528 to 5050 to 35Annealed60 to 76
Rod & Bar75 to 9025 to 5060 to 35Annealed60 to 80
Sheet70 to 8530 to 4545 to 35Annealed65 to 80
Rod & Bar84 to 12055 to 10040 to 22Stress Relieved, Cold-Drawn85 to 20 HRC
Seamless Tube & Pipe70 to 8525 to 4550 to 35Annealed75 Maximum

Monel 400 Physical Properties:

Monel 400 Density (G/CM3)Monel Melting Point (°F)CompressionTensionPoisson’s Ratio TorsionCurle Temperature

(°F)

8.802370 to 246026.026.00.329.570 to 120

Key Features:

  • Corrosion Resistance: The Monel alloy 400 flaunts corrosion resistance from Fluorine, HF, and similar derivatives. It is also resistant to Seawater corrosion
  • High-Temperature Resistance: It stands Heavy Temperature from 1700°F to 2150°F
  • Easy Molding: It can easily be molded into various shapes for industrial requirements backed by excellent Monel 400 machinability.

Product Forms Available:

  • Monel 400 Tube
  • Monel 400 Sheet
  • Monel 400 Pipe
  • Monel 400 Plate
  • Strip
  • Round Bar
  • Forging Stock
  • Flat Bar
  • Hexagon Monel 400 Wire

Applications:

  • Hydrocarbon & Chemical Processing Equipment
  • Marine Engineering
  • Stills for Crude Petroleum
  • Freshwater and Gasoline Tanks
  • Water Heaters for Boiler Feed & Similar Heat Exchangers
  • Pumps, Valves, Fittings, Shafts, & Fasteners
  • De-Aerating Heaters
  • Chlorinated Solvents
  • Commercial-Grade Heat Exchangers
  • Distillation Towers for Crude Oil
  • Chlorinated Solvents

Possible Alternative Grades:

  • Monel 401: Can be used for specialized electronic applications given its brazing characteristics
  • Monel 404: Can be used for its qualities, which include low curing temperature & low permeability
  • Monel K-500: Can be used for its amazing corrosion-resistant property along with added hardness and strength
  • Monel 405: Can be used for the automated stock of a screw machine

Frequently Asked Questions:

  • Is the Alloy 400 similar to Monel 405?

The Monel 405 comes as a free-machine grade for Alloy 400. The percentage of carbon, nickel, iron, manganese, silicon, and copper composition in Monel 405 is the same as the Alloy 400. However, the sulfur content shifts from a low 0.024 to anywhere between 0.025-0.060%.

  • What is the Monel alloy used for?

The Monel-Nickel alloy 400 is used in applications such as chemical processing, marine engineering, as well as hydrocarbon processing. Besides, it can also be used in pumps, shafts, valves, etc.

  • Does the Monel 400 show magnetic properties?

The nickel-copper Monel 400 alloy, when kept at room temperature, is a tad-bit magnetic. It is widely used in oil, chemical, and marine industries. On the other hand, Monel K-500 is non-magnetic.

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