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Monel 400 (UNS NO4400, W.Nr.2.4360, NiCu30Fe)

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Common Names: Monel 400, Alloy 400, Nickel 400, Nickelvac 400, Nicorros 400.
Monel Alloy 400 (UNS N04400; W.Nr. 2.4360, NiCu30Fe) is a solid-solution alloy that can be hardened only by cold working. It has high strength and toughness over a wide temperature range and excellent resistance to many corrosive environments.

Form	ASTM
Rod, bar and wire	B 164
Plate, sheet and strip	B 127, B 906
Seamless pipe and tube	B 165, B 829
Welded pipe	B 725, B 775
Welded tube	B 730, B 751
Welding fitting	B 366
Forging	B 564

Chemical composition

%	Ni	Cu	Fe	C	Mn	Si	S
min	63.0	28.0
max		34.0	2.5	0.30	2.00	0.50	0.024

Physical properties

Density	8.80 g/cm3
Melting range	1300-1350℃

Features: Monel 400 has excellent resistance to corrosion by many reducing media such as sulfuric and hydrochloric acids. It is generally more resistant to corrosion by oxidizing media than higher copper alloys. Monel 400 resists pitting and stress corrosion cracking in most fresh and industrial waters. It has good resistance in flowing seawater, but under stagnant conditions, pitting and crevice corrosion is induced. Monel 400 is probably the most resistant to hydrofluoric acid in all concentrations up to the boiling point, of all engineering alloys. Monel 400 is notable for its toughness, it does not show embrittlement tendency at cryogenic temperatures. It is work hardenable.

Applications: Chemical process equipment, crude oil stills, gasoline and fresh water tanks, marine engineering equipment, valves, pumps and fasteners.

Note: Monel is a registered trademark of the Special Metals Corporation group of companies.

Alloy	ASTM	DIN	BS	AFNOR
Alloy	ASTM	DIN	BS	AFNOR
Monel 400	UNS N04400	2.4360 / NiCu30Fe	NA 12	Nu 30
Monel K-500	UNS N05500	2.4375