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Fujian Inconel 718 Bolt
QS Fastener: Fujian Inconel 718 Bolt
Name: Fujian Inconel 718 Bolt
Thread Standard: ISO261
Material: ASTM B637 UNS N07718
Size: M36
Length: 360mm
Application: High-strength, Corrosion-resistant Nickel Chromium Material for Extreme Environments
Thread Standard: ISO261
Material: ASTM B637 UNS N07718
Size: M36
Length: 360mm
Application: High-strength, Corrosion-resistant Nickel Chromium Material for Extreme Environments
Quantity
The Fujian Inconel 718 Bolt is a high-performance fastener engineered from aerospace-grade nickel-chromium alloy, conforming to ASTM B637 UNS N07718. Manufactured in strict accordance with ISO 261 thread standards, the flagship specification is M36 x 360mm, with custom dimensions readily available. This bolt delivers an exceptional combination of ultra-high tensile strength (≥1300 MPa) and remarkable durability across a vast temperature spectrum from -250°C to 700°C. Its unique precipitation-hardened structure ensures reliable clamping force and fatigue resistance, making it the preferred choice for mission-critical connections in extreme operational settings.
Corrosion Resistance Validation
The outstanding corrosion resistance of the Fujian Inconel 718 Bolt is attributed to its high chromium (~19%), molybdenum (~3%), and stable nickel base (~53%). This chemistry provides a robust passive film that withstands aggressive media:
- General & Pitting Corrosion: In sulfuric acid (20% concentration, 25°C), the corrosion rate is a mere 0.05 mm/year, and even in boiling acid (~250°C), it remains significantly lower than standard 316 stainless steel. In seawater (3.5% NaCl) long-term immersion tests, the annual corrosion rate stays below 0.02 mm/year with no pitting tendency (CPT >60°C).
- Stress Corrosion Cracking (SCC): Tested per NACE TM0177 Method A (5% NaCl + 0.5% CH₃COOH + saturated H₂S, pH 2.7–3.3) under 80% yield stress, the Fujian Inconel 718 Bolt shows no cracking after 720 hours, with a critical stress intensity factor KISCC >55 MPa√m—far outperforming 304 stainless steel, which typically fails within 200 hours.
- Oxidation & Aging: At 700°C, the weight gain rate is only 0.02 mg/cm²·h, forming a protective dual-layer oxide film (Cr₂O₃ + Al₂O₃) with minimal spalling even after 1,000 hours at 800°C.
Applications Across Critical Industries
- Aerospace: Used in jet engine mounts, turbine casings, and exhaust systems where high-temperature strength and resistance to thermal fatigue are non-negotiable.
- Deep-Sea Drilling: In H₂S-rich sour gas wells, these bolts deliver service lives exceeding 15 years, compared to 1–3 years for conventional alloy steels.
- Nuclear Power: In BWR environments (288°C, 2 ppm O₂), they exhibit an SCC crack growth rate of <10⁻⁹ mm/s, ensuring long-term integrity of reactor internals and pressure vessels.
- Chemical Processing: Ideal for reactors, heat exchangers, and pumps handling acids, alkalis, and salt solutions across a broad pH range (2–12).
- Deep-Sea Drilling: In H₂S-rich sour gas wells, these bolts deliver service lives exceeding 15 years, compared to 1–3 years for conventional alloy steels.
- Nuclear Power: In BWR environments (288°C, 2 ppm O₂), they exhibit an SCC crack growth rate of <10⁻⁹ mm/s, ensuring long-term integrity of reactor internals and pressure vessels.
- Chemical Processing: Ideal for reactors, heat exchangers, and pumps handling acids, alkalis, and salt solutions across a broad pH range (2–12).
Industrial Context in Fujian, China
Fujian Province has emerged as a significant hub for specialty fastener manufacturing, leveraging its robust port infrastructure in cities like Xiamen and Fuzhou for efficient raw material import and finished product export. The region hosts a cluster of ISO-certified production facilities that specialize in nickel-alloy forging, precision threading, and solution annealing. Local manufacturers have invested heavily in CNC lathes and cold-heading equipment capable of handling the high work-hardening rate of Inconel 718, ensuring consistent dimensional accuracy and mechanical properties. With a skilled workforce and stringent quality control—including ultrasonic testing and hardness verification—Fujian’s fastener industry is well-positioned to supply both domestic energy projects and international markets, reinforcing its reputation for reliable, high-grade bolting solutions.
Comprehensive Evaluation and Limitations
| Corrosion Type | Optimal Operating Range | Failure Risk Conditions |
| Uniform Corrosion | pH 2–12, T < 200°C | Boiling concentrated HCl (>20%) |
| SCC | H₂S partial pressure <10 psi, pH >2 | High stress (>90% YS) + high-temp H₂S |
| High-Temp Oxidation | T< 900°C, low-sulfur atmosphere | Sulfide hot corrosion (T >700°C) |
Conclusion
The Fujian Inconel 718 Bolt delivers superior corrosion resistance and mechanical strength far surpassing austenitic stainless steels in most demanding scenarios. While caution is advised in reducing acids like hot concentrated HCl or high-temperature sulfur-laden environments, optimized heat treatment (avoiding σ-phase precipitation) and advanced surface coatings can extend its service boundaries. With Fujian’s robust manufacturing expertise and rigorous quality protocols, these bolts remain a reliable, high-integrity fastening solution for extreme engineering challenges worldwide.
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