Monel Metal Alloy 400 & K500 Composition & Properties

MONEL alloy 400 (UNS N04400)

Ni 66.5 Cu 31 Fe 2.5 Mn 2.0 C 0.3 Si 0.5 S 0.024

NUFIT PIPING SOLUTIONS stocks and produces this grade in the following forms: Pipe, Tube, Pipe Fittings, Flanges, Bar, wire, sheet, plate, coil, fasteners and forgings. Request quote on this grade.

Overview

A Nickel-Copper alloy, resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. 

Alloy 400 is a nickel-copper alloy with excellent corrosion resistance in a wide variety of media. The alloy is characterized by good general corrosion resistance, good weldability and moderate to high strength. The alloy has been used in a variety of applications. It has excellent resistance to rapidly flowing brackish water or seawater. It is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated. The alloy is slightly magnetic at room temperature. The alloy is widely used in the chemical, oil and marine industries. 

Characteristics

·         Corrosion resistance in an extensive range of marine and chemical environments. From pure water to no oxidizing mineral acids, salts and alkalis.

·         This alloy is more resistant to nickel under reducing conditions and more resistant than copper under oxidizing conditions, it does show however better resistance to reducing media than oxidizing.

·         Good mechanical properties from subzero temperatures up to about 480C.

·         Good resistance to sulfuric and hydrofluoric acids. Aeration however will result in increased corrosion rates. May be used to handle hydrochloric acid, but the presence of oxidizing salts will greatly accelerate corrosive attack.

·         Resistance to neutral, alkaline and acid salts is shown, but poor resistance is found with oxidizing acid salts such as ferric chloride.

·         Excellent resistance to chloride ion stress corrosion cracking.

Applications

·         Feed water and steam generator tubing.

·         Brine heaters, sea water scrubbers in tanker inert gas systems.

·         Sulfuric acid and hydrofluoric acid alkylation plants.

·         Pickling bat heating coils.

·         Heat exchangers in a variety of industries.

·         Transfer piping from oil refinery crude columns.

·         Plant for the refining of uranium and isotope separation in the production of nuclear fuel.

·         Pumps and valves used in the manufacture of perchlorethylene, chlorinated plastics.

·         Monoethanolamine (MEA) reboiling tube.

·         Cladding for the upper areas of oil refinery crude columns.

·         Propeller and pump shafts.

Chemistry

Chemical Requirements
	Ni	C	Mn	S	Si	Cu	Fe
Max		0.3	2.00	0.024	0.5	34.0	2.50
Min	63.0					28.0

Tensile Data

Mechanical Property Requirements
	Ultimate Tensile	Yield Strength (0.2% OS)	Elong. in 2 in. or 50mm (or 4D), min.,%	R/A	Hardness
Cold Worked/SR
Min	87 KSi	60 KSi	20B
Max
Min	600 MPa	415 MPa
Max
Hot Worked/SR
Min	80 KSi	40 KSi	30D
Max
Min	552 MPa	276 MPa
Max

B- not applicable to diameters or cross sections under 3/32 in (2.4mm).

D-For hot-worked flats 5/16 in. (7.9mm) and under in thickness the elongation shall be 20% min. 

Specifications

Form	Standard
Metal Type	UNS N04400
Bar	ASTM B164 QQ-N-281 Din 17750
Wire
Sheet	ASTM B127 QQ-N-281
Plate	ASTM B127 QQ-N-281
Pipe	ASTM B165
Tube	ASTM B165
Fitting
Forging	ASTM B564
Weld Wire	FM 60/ ERNiCu-7/ 17753
Weld Electrode	FM 190 ENiCu-7
Din	2.4360

Machining

MACHINING DATA
Carbide tools are suggested for rates better than 50% of Type 304.
Machining Type	Suggested starting rates are:
Single Point turning :	Roughing - 0.15" depth, 0.015"/rev feed -175 SFM Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM
Drilling :	1/4" Dia hole - 0.004"/rev feed - 60 SFM 1/2" Dia hole - 0.007"/rev feed - 60 SFM 3/4" Dia hole - 0.010"/rev feed - 60 SFM
Reaming :	Feed - same as drilling - 100 SFM
Side and Slot Milling :	Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM
These rates are for carbide tools, Type C-2 for roughing, drilling and reaming. Type C-3 for finishing.

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