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Incoloy 825 Stud Bolt
QS Fastener: Incoloy 825 Stud Bolt
Name: Incoloy 825 Stud Bolt
Material: Incoloy 825, 2.4858
Standard:DIN 933, UNS N08825, NS1402
Length: 150 mm
Hardness: Max. 200 HB
Size: 1 inch
Feature: Good resistance to stress corrosion cracking
Application: For Industrial areas where the temperature does not exceed 550 degrees Celsius
Material: Incoloy 825, 2.4858
Standard:DIN 933, UNS N08825, NS1402
Length: 150 mm
Hardness: Max. 200 HB
Size: 1 inch
Feature: Good resistance to stress corrosion cracking
Application: For Industrial areas where the temperature does not exceed 550 degrees Celsius
Quantity
Incoloy 825 Stud Bolt is manufactured from premium nickel-iron-chromium alloy UNS N08825 (2.4858/NS1402), conforming to DIN 933 standard with 1-inch diameter × 150 mm length (customizable). With hardness ≤200 HB and exceptional stress corrosion cracking (SCC) resistance, it is engineered for harsh industrial environments up to 550℃, making it ideal for oil refining, high-temperature pipelines, and other critical applications requiring long-term reliability.
1. Stress Corrosion Cracking (SCC) Resistance Analysis
1.1 Chloride-Induced SCC Performance
Incoloy 825 Stud Bolt exhibits superior resistance to chloride-induced SCC. Per NACE TM0177 Method A (42% MgCl₂ boiling solution, 143℃), its critical stress intensity factor (KISCC = 32 MPa√m) significantly outperforms:
- 304L (18 MPa√m)
- 316L (22 MPa√m)
1.1 Chloride-Induced SCC Performance
Incoloy 825 Stud Bolt exhibits superior resistance to chloride-induced SCC. Per NACE TM0177 Method A (42% MgCl₂ boiling solution, 143℃), its critical stress intensity factor (KISCC = 32 MPa√m) significantly outperforms:
- 304L (18 MPa√m)
- 316L (22 MPa√m)
Under 90% yield strength (YS) constant load testing:
- Incoloy 825 Stud Bolt: No cracking after 1000 hours
- 316L: Typically fails within 48–120 hours
- 304L: Cracks develop in 24–72 hours
- Incoloy 825 Stud Bolt: No cracking after 1000 hours
- 316L: Typically fails within 48–120 hours
- 304L: Cracks develop in 24–72 hours
This makes Incoloy 825 Stud Bolt ideal for marine, chemical reactor, and other high-chloride applications.
1.2 Caustic Cracking Resistance
In 50% NaOH + 3% NaCl (120℃):
- Threshold stress: 75% YS (vs. 20% YS for carbon steel A36, 45% YS for 316L)
- Test results:
- Incoloy 825 Stud Bolt: No cracks after 100 hours
- Carbon steel (A36): Fails within 10 hours
- 316L: Cracking occurs at ~50 hours
In 50% NaOH + 3% NaCl (120℃):
- Threshold stress: 75% YS (vs. 20% YS for carbon steel A36, 45% YS for 316L)
- Test results:
- Incoloy 825 Stud Bolt: No cracks after 100 hours
- Carbon steel (A36): Fails within 10 hours
- 316L: Cracking occurs at ~50 hours
This performance validates its suitability for caustic soda tanks, alkali evaporators, and other high-pH environments.
2. Field Performance Comparison
2.1 Offshore Platform Bolts (Cl⁻ + H₂S Environment)
- Incoloy 825 Stud Bolt: >8 years SCC-free service
- 316L: Typically fails within 1–2 years
2.1 Offshore Platform Bolts (Cl⁻ + H₂S Environment)
- Incoloy 825 Stud Bolt: >8 years SCC-free service
- 316L: Typically fails within 1–2 years
2.2 Alkali Pipeline Flange Bolts
- Incoloy 825 Stud Bolt: >10-year service life
- Carbon steel (A193 B7): Fails within 1 year due to caustic cracking
- Incoloy 825 Stud Bolt: >10-year service life
- Carbon steel (A193 B7): Fails within 1 year due to caustic cracking
These results confirm Incoloy 825 Stud Bolt’s unmatched SCC resistance in chloride, H₂S, and high-alkali environments, outperforming conventional stainless and carbon steels.
3. Material Selection Guidelines
- Opt for Incoloy 825 Stud Bolt when:
- High chloride exposure (seawater, chemical media)
- High-temperature sour (H₂S) oil/gas service
- Strong alkali (NaOH/KOH) equipment
- Cost-saving alternative: 316L (non-critical areas) with shorter maintenance intervals
- Opt for Incoloy 825 Stud Bolt when:
- High chloride exposure (seawater, chemical media)
- High-temperature sour (H₂S) oil/gas service
- Strong alkali (NaOH/KOH) equipment
- Cost-saving alternative: 316L (non-critical areas) with shorter maintenance intervals
Conclusion
With outstanding SCC resistance (KISCC 32 MPa√m), Incoloy 825 Stud Bolt is the premier fastener solution for petrochemical, marine, and caustic environments. Whether facing chlorides, H₂S, or strong alkalis, it ensures long-term reliability and reduced maintenance costs.
With outstanding SCC resistance (KISCC 32 MPa√m), Incoloy 825 Stud Bolt is the premier fastener solution for petrochemical, marine, and caustic environments. Whether facing chlorides, H₂S, or strong alkalis, it ensures long-term reliability and reduced maintenance costs.
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