Monel R-405 (UNS N04405 / W.Nr. 2.4360, 2.4361)

Monel R-405 (UNS N04405 / W.Nr. 2.4360, 2.4361 the free-machining version of Monel 400. A controlled amount of sulfur is added to the alloy to provide sulfide inclusions that act as chip breakers during machining. A Ni-Cu alloy with high strength and excellent resistance to a range of media including seawater, hydrofluoric and sulfuric acids, and alkalies. Used in marine and offshore engineering, chemical andhydrocarbon processing equipement, valves, pumps, shafts, fittings, fasteners, and heat exchangers.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Monel R-405	MCu-28-1.5-1.8	НМЖМц28-2.5-1.5	Monel R-405	N04405	NiCu30Fe	2.4360 2.4361	Nu30	Ni68Cu28Fe NA12	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Ni	Cu	Fe
Monel R-405	≤0.30	≤0.50	≤2.00	≤0.030	0.025-0.060	≥63.0	28.0-34.0	≤2.50

Typical Physical and Mechanical Properties (RT, Annealed+Aged)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
8.5	1315-1350	1100	790	20	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM B865, ASME SB865, DIN 17752, DIN 17753, DIN 17754
Plate, Sheet and Strip	DIN 17750
Pipe and Tube	DIN 17751
Welding Product	–
Others	ASTM B366, ASME SB366, DIN 17743

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