Alloy K-500, UNS N05500

Alloy K-500（UNS NO5500）
Summary	A precipitation-hardenable nickel-copper alloy that combines the corrosion resistance of alloy 400 with greater strength and hardness. It also has low permeability and is nonmagnetic to temperatures as lowas -101°. Used for pump shafts, oil-well tools and instruments, doctor blads and scrapers, springs, value rim, 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,%		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/ 8.44
Melting Range,℃ 1315-1350
Typical Mechanical Properties	(Precipitation Hardened) Tensile Strength, ksi 160 Mpa 1100 Yield Strength (0.2% Offset),ksi 115 Mpa 790 Elongation, % 20

Microstructure

Alloy K-500 is derived from the MONEL nickel-copper composition by adding aluminum and titanium. It retains a face-centered cubic (FCC) structure. During age-hardening, a submicroscopic gamma prime (Ni₃Al) phase is formed throughout the matrix, significantly enhancing its strength and hardness.

Characteristics

Excellent corrosion resistance in a wide range of natural and chemical environments.

High resistance to chloride-ion stress-corrosion cracking.

2 to 3 times higher mechanical properties than Monel 400 after age-hardening.

High tensile strength up to approximately 650°C.

Good corrosion fatigue resistance, making it ideal for marine applications.

Low magnetic permeability and remains non-magnetic down to -135°C.

Corrosion Resistance

Similar corrosion resistance to Alloy 400, with excellent performance in environments ranging from pure water to mineral acids, salts, and alkalis.

Virtually immune to chloride-ion stress-corrosion cracking.

May be susceptible to stress-corrosion cracking in aerated hydrofluoric acid vapor under high stress.

Good resistance in high-velocity seawater and marine atmospheres, though pitting may occur in slow-moving or stagnant seawater.

Excellent resistance in sour-gas environments, making it suitable for oil and gas applications.

Applications

Alloy K-500 is widely used in the marine, chemical, petrochemical, and shipbuilding industries due to its strength and corrosion resistance. Common applications include:

• Marine components – Valve seals, pump sleeves, and wear rings for high strength and seawater resistance.
• Industrial tools – Doctor blades and scrapers.
• Fasteners – Bolts used in marine atmospheres and tidal waters, offering high resistance to chloride environments.
• Towing cables – Armor for towing cables, providing high strength, non-magnetic properties, and seawater resistance.
• Oil and gas drilling – Non-magnetic drill collars, valves, and instrumentation sleeves for resistance to chloride-containing media and sour-gas environments.
• Springs – Corrosion-resistant springs for various industrial applications.
• Aerospace components – Aviation instruments requiring non-magnetic properties.

We have products:

Alloy K500 / UNS N05500 Nickel Alloy Tube For Oil And Gas Industry; Alloy 556 / UNS R30556 Nickel Alloy Seamless Tube For Boiler; ASTM B725 / ASME SB725 Alloy K500 / UNS N05500 Nickel Alloy Welded Tube; ASTM B622 / B619 Alloy G-30 / UNS N06030 Nickel Alloy Pipe; Alloy K500 / UNS N05500 Nickel Alloy Pipe For Oil And Gas Industry; PN150 ASTM A366 Alloy K500 / UNS N05500 Nickel Alloy Socket Welding Flange; Alloy K500 / UNS N05500 ASTM B163 / B165 Seamless Nickel Alloy Tube With Eddy Current;