Monel 400 (UNS N04400)

Monel 400 (UNS N04400) is a single phase, solid-solution nickel-copper alloy that offers superior resistance to many corrosive environments over temperatures ranging from sub-zero to 800°F. This alloy is only hardenable through cold working, rather than heat treatment. The Curie Temperature of this alloy lies in the ambient temperature range and is affected by variations in the alloy’s chemical composition. Caution is advised in applications where strong nonmagnetic characteristics are desired. The ratio of copper to nickel in Monel 400 is almost identical to that found in the ore the metal is derived from. This alloy was first patented over 100 years ago, and it continues to be one of the most commonly used corrosion resistant alloys commercially produced.

Equivalent Grades

Trademarks	GB	JIS	KS	ASTM	UNS	DIN	W.Nr	GOST	BS	NF
Monel 400	MCu-28-1.5-1.8	–	–	Monel 400	N04400	NiCu30Fe	2.4360 2.4361	НМЖМц28-2.5-1.5	Ni68Cu28Fe NA12	Nu 30

Product Forms

Wire, Bar, Strip, Sheet, Plate, Tube, Pipe, Pipe Fittings, Forgings

Chemical Composition,%

C	P	S	Mn	Si	Ni	Cu	Fe
≤0.30	≤0.03	≤0.024	≤2.00	≤0.50	≥63.00	28.00~34.00	≤2.50

Typical Physical & Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting point, ℃	Tensile strength, MPa	Yield strength, MPa	Elongation,%
8.80	1300-1350	550	240	40

Specifications

Rod, Bar, Wire, Forgings	ASTM B164/ASME SB164, DIN 17752-17754
Plate, Sheet, Strip	ASTM B127/ASME SB127, DIN 17750
Pipe, Tube	ASTM B163/ASME SB163, ASTM B725/ASME SB725, ASTM B775/ASME SB775, ASTM B751/ASME SB751, DIN17751
Others	ASTM B366/ASME SB366(Fittings), DIN 17743
Welding Products	AWS A5.14/ERNiCu-7, AWS A5.14/ENiCu-7

Features

Resistant to seawater and steam at high temperatures
Excellent resistance to rapidly flowing brackish water or seawater
Excellent resistance to stress corrosion cracking in most freshwaters
Particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated
Offers some resistance to hydrochloric and sulfuric acids at modest temperatures and concentrations, but is seldom the material of choice for these acids
Excellent resistance to neutral and alkaline salt
Resistance to chloride induced stress corrosion cracking
Good mechanical properties from sub-zero temperatures up to 1020°F
High resistance to alkalis