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UNS N05500 Allen Head Bolt
QS Fastener: UNS N05500 Allen Head Bolt
Name: UNS N05500 Allen Head Bolt
Material: Monel K500, 2.4375
Hardness: 140-315 HB
Size: 1/2 inch
Length: 80 mm
Application: For strong acid, strong alkali and high temperature, high pressure
Feature: nonmagnetic, high strength, corrosion resistance
Material: Monel K500, 2.4375
Hardness: 140-315 HB
Size: 1/2 inch
Length: 80 mm
Application: For strong acid, strong alkali and high temperature, high pressure
Feature: nonmagnetic, high strength, corrosion resistance
Quantity
UNS N05500 Allen Head Bolt is manufactured from Monel K500 (2.4375), a high-strength, corrosion-resistant alloy, with dimensions of 1/2 inch diameter and 80mm length. Heat-treated to a hardness of 140-315 HB, it exhibits non-magnetic properties, ultra-high strength, and exceptional resistance to acids, alkalis, and harsh environments. Designed for extreme conditions—including high pressure, high temperature, and aggressive chemical exposure—it is the preferred fastening solution for chemical processing, marine engineering, and nuclear applications, ensuring long-term sealing integrity and structural safety under severe operating conditions.
UNS N05500 Allen Head Bolt leverages Monel K500’s unique γ' phase (Ni₃(Al,Ti)) precipitation strengthening, achieving 3x higher yield strength compared to Monel 400.
- Aging Treatment (595°C × 16h): Forms 10-30nm nano-sized γ' precipitates (15% volume fraction), increasing yield strength by 400MPa via Orowan dislocation pinning.
- Solid-Solution Strengthening: Contributions from Al (2.5-3.5wt%) and Ti (0.35-0.85wt%) add 150MPa strength.
- Cold Working (20% deformation, HCS state): Boosts yield strength up to 950MPa, while Monel 400 (requiring >50% cold work) suffers <10% elongation at 500MPa.
UNS N05500 Allen Head Bolt maintains 20-30% elongation due to its FCC austenitic Ni-Cu matrix, enabling superior dislocation glide.
- Precision Aging (595±5°C × 16±2h): Ensures uniform γ' distribution without coarsening.
- Over-Aging (>620°C): Causes γ' aggregation, reducing elongation (<15%) and promoting intergranular fracture.
- Fractography: Optimal UNS N05500 Allen Head Bolt shows ductile dimples, while annealed Monel 400 exhibits 100% ductile fracture (45% elongation).
(1) Preload Capacity (VDI 2230 Example: M20×2.5 Bolt)
- UNS N05500 Allen Head Bolt: 142kN (830MPa yield) → 2.7x stronger than Monel 400 (52kN).
- UNS N05500 Allen Head Bolt: 142kN (830MPa yield) → 2.7x stronger than Monel 400 (52kN).
- Recommended Preload:
- UNS N05500 Allen Head Bolt: 100kN
- Monel 400: 30kN
- UNS N05500 Allen Head Bolt: 100kN
- Monel 400: 30kN
(2) Case Study: North Sea Offshore Oilfield
- M36 Monel K500 Stud Bolts (ASTM A453 Grade 660): No stress corrosion cracking after 5 years at 850kN preload in 300m seawater.
- 17-4PH Bolts: Hydrogen embrittlement failure within 18 months.
- M36 Monel K500 Stud Bolts (ASTM A453 Grade 660): No stress corrosion cracking after 5 years at 850kN preload in 300m seawater.
- 17-4PH Bolts: Hydrogen embrittlement failure within 18 months.
(3) Additional Advantages
- Self-Lubricating Threads: Prevents galling in subsea flanges & LNG tanks.
- Self-Lubricating Threads: Prevents galling in subsea flanges & LNG tanks.
- Cryogenic Toughness: KIC >120MPa·√m at -162°C (outperforms stainless steel).
- Cost Efficiency: More economical than Inconel 718 (60% higher machining cost) and safer than super duplex steels (UNS S32750), which suffer σ-
phase embrittlement in high-sulfur environments.
Balancing strength, corrosion resistance, and cost, UNS N05500 Allen Head Bolt is the optimal choice for high-load, corrosive environments—particularly in marine, chemical, and nuclear industries. Its engineered microstructure and proven field performance ensure reliability where conventional fasteners fail.
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