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Special Alloy 2205 Bolt and Nut
QS Fastener: Special Alloy 2205 Bolt and Nut
Name: Special Alloy 2205 Bolt and Nut
Material: Alloy 2205
Size: 5/16 to 4 inch
Lenght: 30 to 800 mm
Elongation: 25%
Standard: ANSI, DIN
Grade: A
Feature: Good resistance to chloride ion stress corrosion and good resistance to sulfide stress corrosion. At the same time, it has high mechanical strength.
Application: For Paper industry equipment, Food industry processing equipment, Thermal power plant flue gas desulfurization equipment, Offshore oil platforms, Desalination equipment, Oil field pipelines and equipment and other chemical equipment
Material: Alloy 2205
Size: 5/16 to 4 inch
Lenght: 30 to 800 mm
Elongation: 25%
Standard: ANSI, DIN
Grade: A
Feature: Good resistance to chloride ion stress corrosion and good resistance to sulfide stress corrosion. At the same time, it has high mechanical strength.
Application: For Paper industry equipment, Food industry processing equipment, Thermal power plant flue gas desulfurization equipment, Offshore oil platforms, Desalination equipment, Oil field pipelines and equipment and other chemical equipment
Quantity
Special Alloy 2205 Bolt and Nut are manufactured from high-performance 2205 duplex stainless steel, with sizes ranging from 5/16 inch to 4 inches and lengths from 30 to 800 mm. Compliant with ANSI and DIN standards, these fasteners are classified as Grade A and exhibit an elongation rate of 25%. They offer excellent resistance to chloride-induced stress corrosion cracking (SCC) and sulfide stress corrosion cracking (SCC), along with high mechanical strength. Special Alloy 2205 Bolt and Nut are ideal for high-performance connections, widely used in demanding environments such as oil and gas, chemical processing, and marine engineering.
Special Alloy 2205 is a duplex stainless steel, and its corrosion resistance is one of its core advantages. Below is an analysis of its resistance to pitting, stress corrosion cracking (SCC), and uniform corrosion.
1. Pitting Resistance
Pitting Resistance Analysis:
The PREN (Pitting Resistance Equivalent Number) of Special Alloy 2205 is significantly higher than that of traditional austenitic stainless steels (e.g., 304 with PREN ≈ 19, 316 with PREN ≈ 25), indicating superior pitting resistance in chloride environments.
Pitting Resistance Analysis:
The PREN (Pitting Resistance Equivalent Number) of Special Alloy 2205 is significantly higher than that of traditional austenitic stainless steels (e.g., 304 with PREN ≈ 19, 316 with PREN ≈ 25), indicating superior pitting resistance in chloride environments.
In environments with chloride concentrations up to 10,000 ppm, Special Alloy 2205 Bolt and Nut maintain excellent pitting resistance, whereas 316 stainless steel may exhibit pitting at just 2,000 ppm.
In seawater environments, the pitting potential (Epit) of Special Alloy 2205 Bolt and Nut typically exceeds 1,000 mV (SCE), far higher than the 300-500 mV (SCE) of 316 stainless steel.
2. Stress Corrosion Cracking (SCC) Resistance
Stress Corrosion Cracking (SCC) is a brittle fracture phenomenon that occurs in metals under tensile stress in corrosive environments. Special Alloy 2205 Bolt and Nut demonstrate outstanding SCC resistance, as detailed below:
Chloride Environments: In a 40% CaCl₂ solution, the critical stress intensity factor (KISCC) of Special Alloy 2205 typically exceeds 30 MPa·m^0.5, compared to 10-15 MPa·m^0.5 for 316 stainless steel.
Stress Corrosion Cracking (SCC) is a brittle fracture phenomenon that occurs in metals under tensile stress in corrosive environments. Special Alloy 2205 Bolt and Nut demonstrate outstanding SCC resistance, as detailed below:
Chloride Environments: In a 40% CaCl₂ solution, the critical stress intensity factor (KISCC) of Special Alloy 2205 typically exceeds 30 MPa·m^0.5, compared to 10-15 MPa·m^0.5 for 316 stainless steel.
High-Temperature and High-Pressure Environments: In a 150°C, 10% NaCl solution, the time to failure (Tf) for Special Alloy 2205 Bolt and Nut usually exceeds 1,000 hours, whereas 316 stainless steel fails within 100-200 hours.
Acidic Environments: In a pH=2 H₂SO₄ solution, Special Alloy 2205 Bolt and Nut exhibits significantly lower SCC susceptibility than austenitic stainless steels, with almost no cracking observed.
3. Uniform Corrosion Resistance
Uniform Corrosion refers to the even thinning of a metal surface in a corrosive medium. Special Alloy 2205 Bolt and Nut demonstrate excellent resistance to uniform corrosion in acidic, alkaline, and chloride environments, as follows:
Uniform Corrosion refers to the even thinning of a metal surface in a corrosive medium. Special Alloy 2205 Bolt and Nut demonstrate excellent resistance to uniform corrosion in acidic, alkaline, and chloride environments, as follows:
Acidic Environments:
In a 10% H₂SO₄ solution, the corrosion rate of Special Alloy 2205 is typically below 0.1 mm/year, compared to 0.5 mm/year for 316 stainless steel.
In a 10% H₂SO₄ solution, the corrosion rate of Special Alloy 2205 is typically below 0.1 mm/year, compared to 0.5 mm/year for 316 stainless steel.
In a 5% HCl solution, the corrosion rate of Special Alloy 2205 Bolt and Nut is below 0.2 mm/year, whereas 316 stainless steel exceeds 1.0 mm/year.
Alkaline Environments:
In a 10% NaOH solution, the corrosion rate of Special Alloy 2205 Bolt and Nut is below 0.05 mm/year, demonstrating excellent resistance to alkaline corrosion.
In a 10% NaOH solution, the corrosion rate of Special Alloy 2205 Bolt and Nut is below 0.05 mm/year, demonstrating excellent resistance to alkaline corrosion.
Chloride Environments:
In a 3.5% NaCl solution, the corrosion rate of Special Alloy 2205 Bolt and Nut is below 0.01 mm/year, significantly lower than the 0.1 mm/year of 316 stainless steel.
In a 3.5% NaCl solution, the corrosion rate of Special Alloy 2205 Bolt and Nut is below 0.01 mm/year, significantly lower than the 0.1 mm/year of 316 stainless steel.
In seawater environments, the corrosion rate of Special Alloy 2205 Bolt and Nut is typically below 0.02 mm/year, showcasing superior resistance to seawater corrosion.
Conclusion
Special Alloy 2205 Bolt and Nut excel in pitting resistance, stress corrosion cracking resistance, and uniform corrosion resistance, thanks to their high chromium, molybdenum, and nitrogen content, as well as their duplex structure. In extreme corrosive environments, Special Alloy 2205 Bolt and Nut not only provide extended service life but also significantly reduce maintenance costs, making them the ideal choice for high-performance fasteners.
Special Alloy 2205 Bolt and Nut excel in pitting resistance, stress corrosion cracking resistance, and uniform corrosion resistance, thanks to their high chromium, molybdenum, and nitrogen content, as well as their duplex structure. In extreme corrosive environments, Special Alloy 2205 Bolt and Nut not only provide extended service life but also significantly reduce maintenance costs, making them the ideal choice for high-performance fasteners.
With their exceptional corrosion resistance and mechanical properties, Special Alloy 2205 Bolt and Nut ensure reliability and durability in the most challenging industrial applications.
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