Monel 400-Monel K-500

Monel 400 （UNS N04400）

Monel K-500 （UNS N05500）

Summary

A nickel-copper alloy with high strength and excellent corrosion resistance in a range of media including sea water, hydrofluoric acid,sulfuric acid, and alkalies. Used for marine engineering, chemical and hydrocarbon processing equipment, valves, pumps, shafts, fittings,fasteners, and heat exchangers.

A precipitation-hardenable nickel-copper alloy that combines the corrosion resistance of MONEL alloy 400 with greater strength and hardness. It also has low permeability and is nonmagnetic to temperatures as low as -150°F (-101°C). Used for pump shafts, oil-well tools and instruments, doctor blades and scrapers,springs, valve trim, fasteners, and marine propeller shafts.

Standard
Product Forms

Pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire.

Chemical composition (wt.-%) according to ASTM

	Min.	Max.		Min.	Max.		Min.	Max.
Ni	63.0		Cu	28.0	34.0	C		0.3
Cr			Co			Si		0.5
Fe		2.5	Al			P
Mo			Ti			S		0.024
W			Mn		2.0	N

	Min.	Max.		Min.	Max.		Min.	Max.
Ni	63.0		Cu	27.0	33.0	C		0.18
Cr			Co			Si		0.5
Fe		2.0	Al	2.3	3.15	P
Mo			Ti	0.35	0.85	S		0.01
W			Mn		1.5	N

Physical
Constants

Density,g/cm3							8.8
Melting Range,℃							1300-1350

Density,g/cm3							8.44
Melting Range,℃							1315-1350

Typical
Mechanical
Properties

(Annealed)
抗Tensile Strength,ksi			80
	Mpa		550
Yield Strength (0.2% Offset),ksi			35
		Mpa	240
Elongation,%			40

(Precipitation Hardened)
Tensile Strength, ksi			160
	Mpa		1100
Yield Strength (0.2% Offset), ksi			115
		Mpa	790
Elongation, %			20

Microstructure

Monel 400 is a solid-solution binary alloy. As nickel and copper are mutually soluble in all proportions, it is a single-phase alloy. It has a face-centered cubic lattice structure with a lattice parameter of 3.534 A.

Monel K500 which is produced by adding aluminum and titanium to the basic Monel nickel-copper composition also has a face-centered cubic structure. In the agehardened condition a submicroscopic gamma prime Ni3Al phase is

Characters

Monel 400,with an excellent combination property,is a corrosion resistant alloy in a wide range of use and applications.It has an excellent corrossion resistance in the media of hydrofluoric acid and fluorine and also has a good corrossion resistance to hot strong alkali liquor. Besides it also resistant to corrossion in the neutral solution,water,sea water,air,organic compound etc..One important character of the alloy is that the stress corrossion cracking normorlly doesn't occur and it has a good machinability.

Monel K500 has excellent corrosion resistance in an extensive range of natural and chemical environments, excellent resistance to chloride-ion stress-corrosion cracking and very high strength and hardness. After age-hardening, Monel K500 has approximately 2 to 3 times higher mechanical properties than the nickel-copper alloy (Monel 400), high tensile properties up to about 650 ℃, good corrosion fatigue resistance and ow permeability with non-magnetic down to -135 ℃.

Corrosion Resistance

Monel 400 exhibits resistance to corrosion by many reducing media. It is also generally more resistant to attack by oxidizing media than higher copper alloys. This
versatility makes alloy 400 suitable for service in a variety of
environments.
Alloy 400 is widely used in marine applications. While alloy 400 products exhibit very low corrosion rates in flowing seawater, stagnant conditions have been shown to induce crevice and pitting corrosion. Alloy 400 is also resistant to stress corrosion cracking and pitting in most fresh and industrial waters.
Monel 400 offers exceptional resistance to hydrofluoric acid in all concentrations up to the boiling point. It is perhaps the most resistant of all commonly used
engineering alloys. Alloy 400 is also resistant to many
forms of sulfuric and hydrochloric acids under reducing
conditions.

In general, the corrosion resistance of Monel K500 is similar to that of Monel 400. Excellent resistance is shown to a wide range of media from pure water to mineral acids, salts and alkalis.
Monel K500 is virtually immune to chloride-ion stress-corrosion cracking. In the aged condition, the alloy may be susceptible to stress-corrosion cracking in moist, aerated hydrofluoric acid vapour at stresses near the yield strength.
In high-velocity seawater and in marine atmospheres, good corrosion resistance is shown but, in slow-moving or stagnant seawater, pitting may occur. Nicorros Al also shows good resistance in sour-gas environments.

Applications

Monel 400 is a material in a variety of applications,and is applied in many industrial areas.
1. feed-water and steam generator tubing in power plants
2. brine heaters and evaporator bodies in seawater desalination plants
3. pumps and valves used in the manufacture of chlorinated hydrocarbons
4 cladding for crude oil distillation columns
5. splash-zone sheathing in offshore structures
6. plants for uranium refining and isotope separation
in the production of nuclear fuel
7. propeller and pump shafts for seawater service

Monel K500 finds wide application in the marine, chemical, petrochemical and shipbuilding industries.
Typical applications include:
1. Valve seals, pump sleeves and wear rings in marine
environments – high strength and resistance to seawater；
2. Fasteners, e.g. bolts, used in marine atmospheres and tidal waters – resistance to chloride-containing environments;
3. Doctor blades and scrapers;
4. Towing cable armouring – high strength, non-magnetic properties and resistance to seawater;
5. Oil well drilling equipment such as non-magnetic drill collars, valves and instrumentation sleeves – resistance to chloride-containing media and sour-gas environments;
6.Springs – resistance to a variety of corrosive media;
7.Aviation instrument components – non-magnetic properties.

Shanghai Fengqu Superalloy Co., Ltd.　 Tel:+86-21-69155998 　
Sales:+86-21-69155989/69151848 　 Consulting Tel:13817961313　Fax:+86-21-69151848
Add：101#,Boxue Rd, Jiading District, Shanghai,China Zip：201801 　E-mail:Sales@superalloy.com.cn