Strong Monel K500 UNS N05500 2.4375 Bolt For Harsh Marine And Offshore Applications
Monel K500 (UNS N05500, 2.4375) bolts are high-strength, corrosion-resistant fasteners made from a nickel-copper alloy with added aluminum and titanium. This precipitation-hardened material offers excellent mechanical properties, including high tensile strength, superior corrosion resistance, and exceptional performance in marine and chemical environments. Monel K500 bolts retain the corrosion resistance of Monel 400 but with greater hardness and strength due to age hardening. They resist seawater, acidic and alkaline environments, and stress corrosion cracking, making them ideal for offshore, aerospace, and chemical processing applications. These bolts maintain their properties in extreme temperatures, from cryogenic conditions up to around 480°C (900°F). Common types include hex bolts, studs, and socket head cap screws, available in various sizes and specifications. Monel K500 fasteners comply with ASTM B865 and other industry standards. Their durability and strength make them a reliable choice for demanding applications requiring resistance to harsh conditions.
Trade Code
| Chemical Composition Wt.% | % | Ni | Cu | Fe | C | Mn | Si | S | Al | Ti |
| Min | 63 | 27 | | | | | | 2.3 | 0.35 |
| Max | | 33 | 2 | 0.25 | 1.5 | 0.5 | 0.01 | 3.15 | 0.85 |
| Physical Constants | Density(g/cm³) | 8.05 |
| Melting Range(℃) | 1288-1343 |
| Minimum mechanical properties of alloy at room temperature | Typical mechanical properties | Tensile strength Rm N/mm² | Yield strength RP 0.2 N/mm² | Elongation A5 % |
| Annealing treatment | 1100 | 790 | 20 |
| Category/Type | hex bolts |
| Head type | outer hexagonal |
| Thread tolerance | 6G |
| Material | Monel K500 |
| Performance level | 8.8 |
| Thread specification | M6~M100 |
| Head side length | 10-120(mm) |
| Head thickness | 6.6-60(mm) |
| Total length | 30~800(mm) |
Key features:
Monel K500 (UNS N05500 / 2.4375) bolts offer a combination of high strength, excellent corrosion resistance, and durability. Here are the key features:
1. Material Properties:
- Nickel-copper alloy (around 63% Ni, 30% Cu, with small amounts of Al and Ti).
- Precipitation-hardened for increased strength and hardness compared to Monel 400.
2. Corrosion Resistance:
- Excellent resistance to seawater, acids, and alkaline environments.
- Superior resistance to chloride-induced stress corrosion cracking.
- Performs well in harsh marine, chemical, and aerospace environments.
3. Mechanical Strength:
- Higher tensile and yield strength than Monel 400.
- Maintains strength at elevated and sub-zero temperatures.
- Non-magnetic in annealed condition, but can become slightly magnetic after aging.
4. Temperature Performance:
- Usable in temperatures from cryogenic (-200°C) to around 480°C (900°F).
- Retains toughness and impact strength even at very low temperatures.
Applications:
Monel K500 (UNS N05500 / 2.4375) bolts are widely used in industries that require high strength, corrosion resistance, and durability in harsh environments. Here are some key applications:
1. Marine & Offshore Industry
- Used in shipbuilding, offshore platforms, and subsea applications.
- Ideal for seawater pumps, valves, and fasteners in high-salinity conditions.
- Resistant to biofouling, cavitation, and erosion in saltwater environments.
2. Chemical & Processing Industry
- Used in chemical plants, where resistance to acidic and alkaline environments is crucial.
- Common in heat exchangers, piping systems, and reactors.
3. Oil & Gas Industry
- Applied in offshore drilling rigs, subsea equipment, and oil production systems.
- Resistant to sour gas (H₂S) environments, making it ideal for high-pressure and high-temperature (HPHT) conditions.
- Suitable for downhole and wellhead components.
4. Aerospace & Defense
- Utilized in aircraft landing gear, fasteners, and engine components exposed to high temperatures and corrosive environments.
- Preferred for military marine applications due to superior strength and corrosion resistance.
5. Power Generation
- Used in nuclear and conventional power plants, particularly in steam and turbine components.
- Withstands high-temperature and high-pressure conditions in thermal and nuclear applications.
6. Medical & Pharmaceutical Industry
- Employed in medical devices and pharmaceutical processing equipment that require corrosion-resistant materials.
- Ensures durability in sterilization and clean-room environments.
7. Pulp & Paper Industry
- Suitable for equipment exposed to acidic chemicals, bleach, and high humidity.
- Used in fasteners, pumps, and process piping.
Monel K500 bolts offer a combination of strength, toughness, and excellent corrosion resistance, making them a preferred choice in critical and demanding industries.
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