Recommend Products
Name: Fujian Monel 400 Double End Stud Material: Monel 400 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: Resistant to hydrofluoric acidQS Fastener: Monel 400 Double End Stud
Name: Inconel 625 Double End Stud Material: Inconel 625 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 625 Double End Stud
Name: Xiamen Inconel 600 High Strength Fastener Material: Inconel 600 Standard: ASME Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 High Strength Fastener
Name: Inconel 600 Stud Bolt Putian Material: Inconel 600 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 Stud Bolt
Incoloy 800 Stud Bolt
QS Fastener: Incoloy 800 Stud Bolt
Name: Incoloy 800 Stud Bolt
Material: Incoloy 800, UNS N08800
Length: 100 mm
Size: 1 inch
Hardness: 170 to 220 HB
Application: For Heat Exchangers and Piping Systems
Feature: High Temperature Corrosion Resistance
Material: Incoloy 800, UNS N08800
Length: 100 mm
Size: 1 inch
Hardness: 170 to 220 HB
Application: For Heat Exchangers and Piping Systems
Feature: High Temperature Corrosion Resistance
Quantity
The Incoloy 800 Stud Bolt is manufactured from a high-performance nickel-iron-chromium alloy (UNS N08800), with a hardness range of 170-220 HB. It offers exceptional high-temperature corrosion resistance, making it the ideal fastener for heat exchangers and piping systems. Its superior performance in extreme temperature and corrosive environments positions it as the preferred choice in petrochemical, power generation, and high-temperature equipment applications.
1. High-Temperature Corrosion Resistance
(1) Formation Mechanism & Protective Characteristics of Oxide Film
The Incoloy 800 Stud Bolt spontaneously forms a dual-layer protective oxide film in high-temperature oxidizing environments. This unique film consists of an outer NiFe₂O₄ spinel structure and an inner Cr₂O₃ layer, working synergistically to provide long-term protection.
(1) Formation Mechanism & Protective Characteristics of Oxide Film
The Incoloy 800 Stud Bolt spontaneously forms a dual-layer protective oxide film in high-temperature oxidizing environments. This unique film consists of an outer NiFe₂O₄ spinel structure and an inner Cr₂O₃ layer, working synergistically to provide long-term protection.
- The Cr₂O₃ layer acts as the primary diffusion barrier, effectively blocking oxygen penetration.
- The NiFe₂O₄ outer layer ensures mechanical stability and high-temperature strength.
Oxidation Kinetics Data:
- At 700°C, the oxidation rate is only 0.008 g/m²·h, significantly lower than 304 stainless steel (0.05 g/m²·h).
- At 700°C, the oxidation rate is only 0.008 g/m²·h, significantly lower than 304 stainless steel (0.05 g/m²·h).
- At 900°C, the oxidation rate remains low at 0.02 g/m²·h, 7.5 times lower than 304 stainless steel.
- Even under extreme conditions (1100°C), the Incoloy 800 Stud Bolt maintains oxide film integrity, while 304 stainless steel suffers severe spalling failure.
(2) Carburization Resistance & Sulfur Corrosion Protection
In cracking furnaces and reforming units (carbon-rich environments), the Incoloy 800 Stud Bolt demonstrates superior carburization resistance.
In cracking furnaces and reforming units (carbon-rich environments), the Incoloy 800 Stud Bolt demonstrates superior carburization resistance.
- The Cr₂O₃ inner layer effectively inhibits carbon diffusion, reducing carburization rates by two orders of magnitude compared to standard stainless steels.
- The addition of Ti/Al microalloying elements promotes TiC/Al₂O₃ nanoparticle formation, blocking carbon migration along grain boundaries.
Experimental Data:
- After 5000 hours in a CH₄/H₂ atmosphere at 900°C, the carburized layer depth is only 15-20 µm, versus 80-100 µm for 321 stainless steel.
In H₂S-containing environments, the alloy forms a protective CrS + Ni₃S₂ mixed layer to resist sulfur attack:
Case Study:
- After 5 years in a cracking furnace (800°C, 0.1% H₂S):
- After 5 years in a cracking furnace (800°C, 0.1% H₂S):
- Total oxidation/sulfidation thickness: 45±5 µm.
- No significant sulfur penetration detected in the base material.
2. Usage Limitations & Engineering Recommendations
Despite its outstanding high-temperature corrosion resistance, the **Incoloy 800 Stud Bolt** has some operational limitations:
1) Reducing atmospheres may compromise oxide film stability.
2) Under severe thermal cycling, oxide spalling may occur.
3) High-concentration halogens can trigger active oxidation.
Despite its outstanding high-temperature corrosion resistance, the **Incoloy 800 Stud Bolt** has some operational limitations:
1) Reducing atmospheres may compromise oxide film stability.
2) Under severe thermal cycling, oxide spalling may occur.
3) High-concentration halogens can trigger active oxidation.
Optimization Measures for High-Temperature Fastening:
- Aluminizing the threads enhances oxidation resistance at higher temperatures.
- For applications above 800°C, use Inconel 718 washers to compensate for thermal relaxation effects.
- Aluminizing the threads enhances oxidation resistance at higher temperatures.
- For applications above 800°C, use Inconel 718 washers to compensate for thermal relaxation effects.
Validation:
- EBR-II Reactor Simulation Tests confirmed that the Incoloy 800 Stud Bolt exhibits high consistency with predictive models (error <5%) after 10,000 hours at 900°C, proving its reliability in real-world engineering applications.
- EBR-II Reactor Simulation Tests confirmed that the Incoloy 800 Stud Bolt exhibits high consistency with predictive models (error <5%) after 10,000 hours at 900°C, proving its reliability in real-world engineering applications.
3. Industry Applications & Comparative Analysis
Key Advantages in Critical Sectors:
- Petrochemical Industry: Ideal for cracking furnaces, reformers, and high-temperature reactors.
- Power Generation: Resists high-temperature steam and oxidation, suitable for boiler systems and turbine fastening.
- High-Temperature Equipment: Performs reliably in heat treatment furnaces and heating elements.
Key Advantages in Critical Sectors:
- Petrochemical Industry: Ideal for cracking furnaces, reformers, and high-temperature reactors.
- Power Generation: Resists high-temperature steam and oxidation, suitable for boiler systems and turbine fastening.
- High-Temperature Equipment: Performs reliably in heat treatment furnaces and heating elements.
Material Comparison:
- 304/321 Stainless Steel: Prone to high-temperature oxidation and carburization failure.
- Inconel 600: Higher temperature resistance but costly and difficult to machine.
- Incoloy 800 Stud Bolt: The optimal choice due to its cost-performance balance and comprehensive properties in high-temperature corrosive environments.
- 304/321 Stainless Steel: Prone to high-temperature oxidation and carburization failure.
- Inconel 600: Higher temperature resistance but costly and difficult to machine.
- Incoloy 800 Stud Bolt: The optimal choice due to its cost-performance balance and comprehensive properties in high-temperature corrosive environments.
Send Message
