Monel Alloy 400

UNS N04400

Other common names: Alloy 400

W.Nr.2.4360, 2.4361

ASTM: B164, B564, B127, B165, B725, B730

ASME: SB164, SB564, SB127, SB165, SB725, SB730

QQ-N-281

Mil-T-1368

EN10204 3.1

Monel 400 is a nickel-copper alloy (approximately 67% nickel - 23% copper) that is resistant to high-temperature seawater and steam as well as salt and corrosive solutions. Alloy 400 is a solid solution alloy that corrodes only by cold working. This type of nickel alloy has good corrosion resistance, good weldability, and high strength. Low corrosion rates in fast-moving saltwater or seawater, good resistance to corrosion cracking in most freshwaters, and resistance to a wide range of corrosive conditions have led to extensive evaluation for marine applications and other non-oxidizing chloride solutions.

Monel Alloy 400
Nickel alloys are particularly resistant to hydrochloric and hydrofluoric acids when outgassed. As is evident from its high copper content, Alloy 400 will quickly be monitored by nitric acid and ammonia systems.

Monel 400 has excellent mechanical properties at sub-zero temperatures and can be used at temperatures up to 1000° F. It has a melting point of 2370-2460° F. However, Alloy 400 is weak in the annealed condition, so a variety of tempering methods can be used to increase strength.

In what forms does Gnee Steel offer Monel 400?
Plates
Plates
Bars
Tubes (welded and seamless)
Fittings
Elbows, tees, stub ends, return pipes, caps, crossheads, reducers, unions, etc.
Wires
What are the characteristics of Monel 400?
Resistant to high temperatures of seawater and steam
Resistant to fast-moving brackish or seawater
Excellent resistance to stress corrosion cracking in most freshwaters
Particularly resistant to degassed hydrochloric and hydrofluoric acids
Some resistance to hydrochloric and sulfuric acids at moderate temperatures and concentrations, but rarely the material of choice for these acids
Resistant to neutral and alkaline salts
Resistant to stress corrosion cracking caused by chlorides
Good mechanical properties from sub-zero temperatures to 1020°F
High resistance to alkalis