Views: 7 Author: Site Editor Publish Time: 2025-05-23 Origin: Site
MONEL K-500 (UNS N05500 / W.Nr. 2.4375) is a nickel-copper alloy that combines the excellent corrosion resistance of MONEL 400 with the added benefit of higher strength and hardness. It inherits the superior corrosion resistance of the Monel series alloys, and its mechanical properties, especially its high strength and fatigue resistance, are further enhanced by the addition of elements like aluminum and titanium. This is achieved through a controlled heating process that precipitates submicroscopic particles of Ni3(Ti, Al) throughout the matrix. The heat treatment used to achieve this precipitation is commonly referred to as age hardening or aging.
MONEL K-500 is suitable for operations in geological formations with high sulfur and high wax content. As the alloy has no ductile-to-brittle transition temperature, it is highly suitable for various low-temperature equipment. MONEL K-500 alloy not only possesses excellent mechanical properties such as high strength, corrosion resistance, and non-magnetism, but also offers comparable weldability to MONEL 400. It is commonly used as a pump shaft material.
(1) Excellent Corrosion Resistance
Monel K-500 nickel alloy exhibits outstanding corrosion resistance, especially in marine environments. It can resist seawater, salt spray, and various chemical media, including acidic, alkaline, and saline solutions.
(2) High Strength and Fatigue Resistance
Monel K-500 has enhanced mechanical properties due to the addition of elements such as aluminum and titanium. It possesses high strength and toughness at room temperature. Additionally, the alloy offers excellent fatigue resistance, maintaining good mechanical properties under cyclic loading conditions.
(3) Good Workability
Monel K-500 demonstrates good workability and can be processed through various methods such as forging, rolling, and welding. It performs well during cold working and can withstand significant deformation without cracking.
(4) Low Magnetic Permeability
Monel K-500 has low magnetic permeability, giving it a unique advantage in environments where low magnetic interference is required.
Element | Min % | Max % |
Ni | 63 | 70 |
Co | – | 2 |
Cu | 27 | 33 |
Fe | – | 2 |
Al | 2.3 | 3.15 |
C | – | 0.25 |
Si | – | 0.5 |
Mn | – | 1.5 |
Ti | 0.35 | 0.85 |
S | – | 0.01 |
Plate：Typically supplied in the annealed condition to ensure good workability.
Bar：Supplied in hot-rolled or cold-drawn condition, with heat treatment available as per user requirements.
Pipe：Seamless pipes are usually supplied in the annealed condition, while welded pipes require appropriate heat treatment.
Wire：Supplied in cold-drawn or annealed condition, with processing available as per user requirements.
Forgings：Supplied in the forged condition, requiring heat treatment to restore optimal properties.
Mechanical Properties-UnagedA(Bar,Rod,Forgings) | |||
Form | Condition | Hardness | |
Brinell 3000 kg,max | Rockwell,max | ||
Rounds,B hexagons,squares,rectangles,and forgings | Hot-worked | 245 | C23 |
Hexagons | Cold-worked | 260 | C26 |
Rounds: | |||
/4(6.4 mm)to 1 in. (25.4 mm),incl | Cold-worked | 280 | C29 |
Over 1 (25.4 mm)to 3 in. (76.2 mm),incl | Cold-worked | 260 | C26 |
Over 3(76.2 mm)to 4 in. (101.6 mm),incl | Cold-worked | 240 | C22 |
Rounds,hexagons,squares,rectangles,and forgings | Hot-worked or coldworked and annealed | 185 | B90 |
Mechanical Properties-Age-HardenedA(Bar,Rod,and Forgings) | |||||||
Form | Condition | Maximum Section | Tensile | Yield Strength,0.2 | ElongationB in 2 | HardnesSC | |
Brinell | Rockwell | ||||||
Rounds,hexagons, | Hot-worked and | All sizes | 140(965) | 100 (690) | 20.0 | 265 | 27 |
Rounds | Cold-worked and | 14(6.4)to 1 | 145(1000) | 110(760) | 15.0 | 300 | 32 |
over 1 (25.4)to 3 | 140(965) | 100 (690) | 17.0 | 280 | 29 | ||
over 3(76.2)to 4 | 135(930) | 95(655) | 20.0 | 255 | 25 | ||
Hexagons | Cold-worked and | 4(6.4)to 2 | 140(965) | 100(690) | 15.0 | 265 | 27 |
Rounds,hexagons, | Annealed and | Up to 1(25.4) | 130(895) | 90 (620) | 20.0 | 250 | 24 |
1(25.4)and over | 130(895) | 85(585) | 20.0 | 250 | 24 | ||
Marine Engineering: Pump shafts, propeller shafts, seawater valves
Oil & Gas: Drilling tools, downhole instruments, valve components
Chemical Equipment: Heat exchangers, reactors, fasteners
Aerospace: Turbine blades, structural connectors
Electronics: Low-magnetic components, sensor housings
Medical Devices: Corrosion-resistant housings and connectors
The processability of Monel K500 alloy is relatively good, but due to its high hardness, appropriate tools and equipment need to be selected during the processing. The alloy can be processed by traditional cutting methods such as turning, milling and grinding. After heat treatment, the hardness increases significantly, and the processing difficulty increases accordingly. Therefore, in practical applications, fine heat treatment processes are often used to ensure its performance.
Regarding welding performance, although Monel K500 has certain weldability, its welding process needs to be strictly controlled. Due to the presence of titanium and aluminum, cracks are prone to occur during welding, so using suitable welding materials and controlling welding parameters are the key to ensuring welding quality.
This alloy has good ductility and can be easily formed by standard methods in the annealed condition.
Hot forming temperature range is 880-1150°C. Withdraw the piece when heated, as prolonged soaking at this temperature is harmful. For best results, the last forging operation should include reheating to 1090°C and at least 30% reduction of area. Water quench is the recommended method of cooling.
Cold forming should be carried in the annealed condition. It requires significant force but yields good results due to the alloy's excellent ductility.
For annealed or lightly cold-worked material, age hardening is performed at 1125°F for 16 hours, followed by furnace cooling at a rate of 15°F to 25°F per hour down to 900°F. The cooling rate from 900°F to room temperature is not critical. For heavily cold-worked material, aging should be performed at 1000°F for at least 6 hours, followed by furnace cooling at a rate of 15°F to 25°F per hour down to 900°F.
The alloy can be annealed after cold working, or it can be precipitation hardened through age heat treatment.
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
- Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
We Export Monel K-500 to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc
1. Is Monel better than stainless steel?
The difference between Monel alloy and stainless steel lies mainly in the two chemical elements. The main elements of Monel alloy are nickel and copper, so we generally call it copper-nickel alloy. The commonly used materials are Monel400 and MonelK500. The main element of stainless steel is iron, which accounts for more than half, with the addition of chromium and nickel elements. The cost is relatively low, but Monel alloy has better corrosion resistance and high temperature resistance than stainless steel, is non-magnetic, and has high strength.
2. What is the difference between Monel 400 and K-500?
Monel K500 alloy has excellent corrosion resistance and higher strength and hardness than Monel 400. This is because elements such as Al and Ti are added to the alloy, and after a certain heat treatment, dispersed intermetallic compounds exist on the matrix. The organizational structure is a single-phase austenite structure and is precipitated by dispersed Ni3 (Al, Ti) precipitates.
Monel K500 has about three times the yield strength and twice the tensile strength of Monel 400, and higher mechanical properties can be obtained through cold working or aging hardening. Monel K500 alloy has the same corrosion resistance as Monel 400 alloy.
