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UNS N07718 Stud Bolt
QS Fastener: UNS N07718 Stud Bolt
Name: UNS N07718 Stud Bolt
Material: UNS N07718
Type: Nickel Alloy Stud Bolt
Standard: ISO 261
Complete: One Stud Bolt with Two Nuts
Heat Treatment: Solid Solution 1000℃ and Precipitation Hardening 720℃
Size: M36
Length: 360mm
Usage : For High Temperature Service
Material: UNS N07718
Type: Nickel Alloy Stud Bolt
Standard: ISO 261
Complete: One Stud Bolt with Two Nuts
Heat Treatment: Solid Solution 1000℃ and Precipitation Hardening 720℃
Size: M36
Length: 360mm
Usage : For High Temperature Service
Quantity
UNS N07718 Stud Bolt - Manufactured from high-performance nickel-based alloy UNS N07718 (Inconel 718) through 1000°C solution treatment + 720°C age hardening, delivering exceptional high-temperature resistance, oxidation protection, and creep performance. Compliant with ISO 261 standard (specification: M36×360mm), it's engineered for extreme temperature applications (petrochemical, nuclear power, aircraft engines) with customizable standards and dimensions.
1. High-Temperature Strength & Creep Resistance
UNS N07718 Stud Bolt maintains continuous service at 700°C with peak tolerance up to 1000°C (oxidation threshold), enabled by dual precipitation strengthening:
- γ'' phase (Ni₃Nb): Exceptional stability below 650°C, preserving ≥800 MPa tensile strength at 700°C
- γ' phase (Ni₃(Al,Ti)): Supplementary strengthening above 700°C, delaying creep deformation
UNS N07718 Stud Bolt maintains continuous service at 700°C with peak tolerance up to 1000°C (oxidation threshold), enabled by dual precipitation strengthening:
- γ'' phase (Ni₃Nb): Exceptional stability below 650°C, preserving ≥800 MPa tensile strength at 700°C
- γ' phase (Ni₃(Al,Ti)): Supplementary strengthening above 700°C, delaying creep deformation
By comparison, 304/316 stainless steel bolts experience:
- Tensile strength drop to ≤300 MPa above 600°C
- Accelerated creep from carbide aggregation
- Temperature ceiling: ≤600°C
- Tensile strength drop to ≤300 MPa above 600°C
- Accelerated creep from carbide aggregation
- Temperature ceiling: ≤600°C
2. Oxidation Resistance & Critical Temperatures
UNS N07718 Stud Bolt relies on Cr₂O₃/Al₂O₃ protective layers:
- ≤700°C: Dense Cr₂O₃ limits oxidation to <0.1 mm/year
- 800-1000°C: Local oxide rupture mitigated by Nb/Ti-induced Al₂O₃ regeneration (safe for <100 hours)
- >1000°C: Rapid oxidation necessitates protective coatings
UNS N07718 Stud Bolt relies on Cr₂O₃/Al₂O₃ protective layers:
- ≤700°C: Dense Cr₂O₃ limits oxidation to <0.1 mm/year
- 800-1000°C: Local oxide rupture mitigated by Nb/Ti-induced Al₂O₃ regeneration (safe for <100 hours)
- >1000°C: Rapid oxidation necessitates protective coatings
304/316 stainless steel bolts suffer from:
- Cr₂O₃ volatility above 650°C (>0.5 mm/year oxidation)
- Intergranular corrosion risks
- Cr₂O₃ volatility above 650°C (>0.5 mm/year oxidation)
- Intergranular corrosion risks
3. Microstructural Stability
- UNS N07718 Stud Bolt:
- Nb (~5.2%) and Mo (~3.0%) suppress δ-phase (Ni₃Nb) coarsening
- Prevents high-temperature loosening/fracture
- UNS N07718 Stud Bolt:
- Nb (~5.2%) and Mo (~3.0%) suppress δ-phase (Ni₃Nb) coarsening
- Prevents high-temperature loosening/fracture
- 304/316 Stainless Steel:
- M₂₃C₆ carbide grain-boundary precipitation above 600°C
- Causes embrittlement and stress corrosion cracking
- M₂₃C₆ carbide grain-boundary precipitation above 600°C
- Causes embrittlement and stress corrosion cracking
4. Performance Validation & Standards
- UNS N07718 Stud Bolt (ASTM B637):
- 700°C yield strength ≥550 MPa
- 1000°C oxidation: 2.5 mg/cm² (100h per ASTM G54)
- UNS N07718 Stud Bolt (ASTM B637):
- 700°C yield strength ≥550 MPa
- 1000°C oxidation: 2.5 mg/cm² (100h per ASTM G54)
- 316 Stainless Steel (ASME SA-240):
- 700°C yield strength ~150 MPa
- Oxidation exceeds 15 mg/cm²
- 700°C yield strength ~150 MPa
- Oxidation exceeds 15 mg/cm²
5. Application Comparison
| Application | UNS N07718 Stud Bolt | 304/316 Stainless Bolts |
| Aircraft turbine disks | 650-700°C | Not recommended |
| Oil drilling equipment | High-pressure/temperature | Limited to auxiliary systems |
| Boiler piping | Overqualified | Standard choice (<600°C) |
Conclusion
The UNS N07718 Stud Bolt outperforms stainless steel alternatives through γ''/γ' phase strengthening, superior oxidation resistance, and microstructural stability. ASTM/ASME-verified data confirms its dominance for extreme environments in petrochemical, nuclear, and aerospace industries.
The UNS N07718 Stud Bolt outperforms stainless steel alternatives through γ''/γ' phase strengthening, superior oxidation resistance, and microstructural stability. ASTM/ASME-verified data confirms its dominance for extreme environments in petrochemical, nuclear, and aerospace industries.
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