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BSW NA21 Fastener
QS Fastener: BSW NA21 Fastener
Name: BSW NA21 Fastener
Material: Inconel 625/NC22DNb
Size: M8 to M64
Length: 30 to 800 mm
Class: 12.9
Standard: UNS, DIN, BSW, NF
Hardness: 220 HB
Feature: Excellent Corrosion Resistance, Certified to NACE standard by the American Society of Corrosion Engineers
Application: For Chemical process industries and Ssituations in Contact with Seawater and Subjected to High Mechanical Stress
Material: Inconel 625/NC22DNb
Size: M8 to M64
Length: 30 to 800 mm
Class: 12.9
Standard: UNS, DIN, BSW, NF
Hardness: 220 HB
Feature: Excellent Corrosion Resistance, Certified to NACE standard by the American Society of Corrosion Engineers
Application: For Chemical process industries and Ssituations in Contact with Seawater and Subjected to High Mechanical Stress
Quantity
The BSW NA21 Fastener is made from Inconel 625/NC22DNb, with sizes ranging from M8 to M64 and lengths from 30 to 800 mm, meeting diverse engineering needs. With a high strength grade of 12.9, it complies with international standards such as UNS, DIN, BSW, and NF, and has a hardness not exceeding 220 HB, offering excellent mechanical properties. Certified by the National Association of Corrosion Engineers (NACE), the BSW NA21 Fastener demonstrates outstanding corrosion resistance, making it particularly suitable for the chemical industry and high mechanical stress environments exposed to seawater. Under extreme conditions, this fastener ensures the safety and stability of equipment, making it an ideal choice for high-performance connections. Whether in complex chemical processing equipment or demanding marine engineering applications, the BSW NA21 Fastener provides durable and reliable performance support.
Corrosion Resistance of BSW NA21 Fastener Material
The BSW NA21 Fastener exhibits excellent corrosion resistance in various acidic media, primarily due to its high nickel, chromium, and molybdenum content. These elements work together to form a stable passive film, effectively resisting the erosion of acidic media.
The BSW NA21 Fastener exhibits excellent corrosion resistance in various acidic media, primarily due to its high nickel, chromium, and molybdenum content. These elements work together to form a stable passive film, effectively resisting the erosion of acidic media.
Performance in Sulfuric Acid (H₂SO₄) Environments
The BSW NA21 Fastener demonstrates good corrosion resistance in sulfuric acid environments, especially under low concentrations and ambient temperatures. As the concentration and temperature of sulfuric acid increase, the corrosion rate rises but remains at a low level.
The BSW NA21 Fastener demonstrates good corrosion resistance in sulfuric acid environments, especially under low concentrations and ambient temperatures. As the concentration and temperature of sulfuric acid increase, the corrosion rate rises but remains at a low level.
- In 10% sulfuric acid at room temperature (25°C), the BSW NA21 Fastener shows almost no significant corrosion, with a corrosion rate of <0.05 mm/year, making it suitable for the storage and transportation of dilute sulfuric acid in chemical equipment.
- In 50% sulfuric acid, the BSW NA21 Fastener still exhibits good corrosion resistance, with a corrosion rate of <0.2 mm/year, making it suitable for sulfuric acid concentration equipment and pipelines.
Performance in Hydrochloric Acid (HCl) Environments
Hydrochloric acid is a highly corrosive medium that poses significant challenges to most metals. However, Inconel 625 demonstrates good corrosion resistance in hydrochloric acid environments, particularly under low concentrations and ambient temperatures.
Hydrochloric acid is a highly corrosive medium that poses significant challenges to most metals. However, Inconel 625 demonstrates good corrosion resistance in hydrochloric acid environments, particularly under low concentrations and ambient temperatures.
- In 10% hydrochloric acid, the BSW NA21 Fastener has a low corrosion rate of <0.1 mm/year, making it suitable for the storage and transportation of dilute hydrochloric acid in chemical equipment.
- In 20% hydrochloric acid, the corrosion rate of Inconel 625 increases but remains within acceptable limits, with a corrosion rate of <0.3 mm/year, making it suitable for equipment in moderate hydrochloric acid environments.
Performance in Hydrofluoric Acid (HF) Environments
Hydrofluoric acid is an extremely corrosive medium that aggressively attacks most metals. However, the BSW NA21 Fastener exhibits excellent corrosion resistance in hydrofluoric acid environments, especially under low concentrations and ambient temperatures.
Hydrofluoric acid is an extremely corrosive medium that aggressively attacks most metals. However, the BSW NA21 Fastener exhibits excellent corrosion resistance in hydrofluoric acid environments, especially under low concentrations and ambient temperatures.
- In 10% hydrofluoric acid, Inconel 625 shows almost no significant corrosion, with a corrosion rate of <0.02 mm/year, making it suitable for the storage and transportation of hydrofluoric acid in chemical equipment.
Mechanism of Acid Corrosion Resistance
The acid corrosion resistance of the BSW NA21 Fastener is primarily attributed to its alloy composition and the formation of a passive film:
- Nickel (Ni): Provides base corrosion resistance, especially in reducing acidic media.
The acid corrosion resistance of the BSW NA21 Fastener is primarily attributed to its alloy composition and the formation of a passive film:
- Nickel (Ni): Provides base corrosion resistance, especially in reducing acidic media.
- Chromium (Cr): Forms a dense Cr₂O₃ passive film, effectively resisting the erosion of acidic media.
- Molybdenum (Mo): Enhances the alloy's resistance to pitting and crevice corrosion in chloride-containing acidic media.
Practical Applications
- Chemical Equipment: The BSW NA21 Fastener is used in the manufacturing of sulfuric acid, hydrochloric acid, and hydrofluoric acid storage tanks, pipelines, and valves, demonstrating excellent corrosion resistance and long-term reliability.
- Flue Gas Desulfurization Systems: In wet flue gas desulfurization processes, the BSW NA21 Fastener is used in the construction of absorption towers and circulation pumps, effectively resisting corrosion from sulfuric acid and chlorides.
- Nuclear Fuel Processing: In uranium enrichment and nuclear fuel reprocessing, the BSW NA21 Fastener is used in the manufacturing of hydrofluoric acid reactors and pipelines, exhibiting excellent corrosion resistance.
Conclusion
The BSW NA21 Fastener, made from Inconel 625/NC22DNb, demonstrates outstanding corrosion resistance in various acidic media, including sulfuric acid, hydrochloric acid, and hydrofluoric acid. Its low corrosion rate and stable passive film make it an ideal choice for industries such as chemical processing, nuclear energy, and environmental protection. Whether in low or moderate concentration acidic environments, the BSW NA21 Fastener provides long-term reliability and durability, meeting the demands of harsh operating conditions.
The BSW NA21 Fastener, made from Inconel 625/NC22DNb, demonstrates outstanding corrosion resistance in various acidic media, including sulfuric acid, hydrochloric acid, and hydrofluoric acid. Its low corrosion rate and stable passive film make it an ideal choice for industries such as chemical processing, nuclear energy, and environmental protection. Whether in low or moderate concentration acidic environments, the BSW NA21 Fastener provides long-term reliability and durability, meeting the demands of harsh operating conditions.
When selecting fasteners for critical applications in chemical and nuclear industries, the BSW NA21 Fastener stands out as a robust and dependable solution, ensuring performance and longevity in challenging environments.
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