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NF NC21FeDU Nut
QS Fastener: NF NC21FeDU Nut
Name: NF NC21FeDU Nut
Material: NiCr21Mo
Standard: NF, BSW, ANSI, DIN
Size: M64
Hardness: Max. 200 HB
Feature: Good resistance to stress corrosion cracking
Application: For Industrial areas where the temperature does not exceed 550 degrees Celsius
Material: NiCr21Mo
Standard: NF, BSW, ANSI, DIN
Size: M64
Hardness: Max. 200 HB
Feature: Good resistance to stress corrosion cracking
Application: For Industrial areas where the temperature does not exceed 550 degrees Celsius
Quantity
The NF NC21FeDU Nut is manufactured from NiCr21Mo material, offering exceptional resistance to stress corrosion cracking and is specifically designed for high-temperature industrial environments. Available in standards such as NF, BSW, ANSI, and DIN, it comes in a size of M64 with a maximum hardness of 200 HB, ensuring stable operation at temperatures up to 550°C. Its excellent corrosion resistance and mechanical properties make it an ideal choice for applications in the chemical, energy, and high-temperature industrial sectors.
Incoloy 825, a nickel-based alloy, exhibits outstanding corrosion resistance in strong acids, alkalis, and chloride environments due to its unique chemical composition and microstructure. The NF NC21FeDU Nut is precisely engineered from this high-performance material, providing reliable solutions for fastening needs in extreme environments.
1. Material Characteristics and Corrosion Mechanisms
The corrosion resistance of the NF NC21FeDU Nut is primarily attributed to its high content of nickel, chromium, molybdenum, and copper, as well as the stabilizing effect of titanium:
Nickel (Ni): Provides excellent resistance to corrosion in reducing media, particularly in acidic environments.
Chromium (Cr): Forms a dense Cr₂O₃ oxide film, offering protection against oxidation and corrosion.
Molybdenum (Mo): Enhances resistance to chloride-induced pitting and crevice corrosion.
Copper (Cu): Improves corrosion resistance in reducing acids such as sulfuric and phosphoric acids.
Titanium (Ti): Prevents intergranular corrosion through stabilization treatment.
The corrosion resistance of the NF NC21FeDU Nut is primarily attributed to its high content of nickel, chromium, molybdenum, and copper, as well as the stabilizing effect of titanium:
Nickel (Ni): Provides excellent resistance to corrosion in reducing media, particularly in acidic environments.
Chromium (Cr): Forms a dense Cr₂O₃ oxide film, offering protection against oxidation and corrosion.
Molybdenum (Mo): Enhances resistance to chloride-induced pitting and crevice corrosion.
Copper (Cu): Improves corrosion resistance in reducing acids such as sulfuric and phosphoric acids.
Titanium (Ti): Prevents intergranular corrosion through stabilization treatment.
The NF NC21FeDU Nut optimizes the proportions of these elements to ensure long-term stability in high-temperature and corrosive environments.
2. Corrosion Resistance in Strong Acid Environments
The NF NC21FeDU Nut performs exceptionally well in various strong acid environments, with the following data:
Sulfuric Acid (H₂SO₄):
Concentration ≤10%, temperature ≤50°C: Corrosion rate <0.1 mm/year.
Concentration ≤50%, temperature ≤30°C: Corrosion rate <0.5 mm/year.
The NF NC21FeDU Nut performs exceptionally well in various strong acid environments, with the following data:
Sulfuric Acid (H₂SO₄):
Concentration ≤10%, temperature ≤50°C: Corrosion rate <0.1 mm/year.
Concentration ≤50%, temperature ≤30°C: Corrosion rate <0.5 mm/year.
Hydrochloric Acid (HCl):
Concentration ≤5%, temperature ≤40°C: Corrosion rate <0.1 mm/year.
Concentration ≤10%, temperature ≤25°C: Corrosion rate <0.3 mm/year.
Concentration ≤5%, temperature ≤40°C: Corrosion rate <0.1 mm/year.
Concentration ≤10%, temperature ≤25°C: Corrosion rate <0.3 mm/year.
Phosphoric Acid (H₃PO₄):
Concentration ≤85%, temperature ≤100°C: Corrosion rate <0.05 mm/year.
Concentration ≤85%, temperature ≤100°C: Corrosion rate <0.05 mm/year.
Nitric Acid (HNO₃):
Concentration ≤65%, temperature ≤50°C: Corrosion rate <0.1 mm/year.
Concentration ≤65%, temperature ≤50°C: Corrosion rate <0.1 mm/year.
The NF NC21FeDU Nut excels in strong acid environments, ensuring long-term stable operation of equipment in acidic media.
3. Corrosion Resistance in Strong Alkali Environments
The NF NC21FeDU Nut also demonstrates excellent corrosion resistance in strong alkali environments:
Sodium Hydroxide (NaOH):
Concentration ≤50%, temperature ≤100°C: Corrosion rate <0.05 mm/year.
Concentration ≤70%, temperature ≤50°C: Corrosion rate <0.1 mm/year.
The NF NC21FeDU Nut also demonstrates excellent corrosion resistance in strong alkali environments:
Sodium Hydroxide (NaOH):
Concentration ≤50%, temperature ≤100°C: Corrosion rate <0.05 mm/year.
Concentration ≤70%, temperature ≤50°C: Corrosion rate <0.1 mm/year.
Potassium Hydroxide (KOH):
Concentration ≤50%, temperature ≤100°C: Corrosion rate <0.05 mm/year.
Concentration ≤50%, temperature ≤100°C: Corrosion rate <0.05 mm/year.
The NF NC21FeDU Nut is protected by the Cr₂O₃ oxide film in alkali environments, preventing alkali-induced corrosion.
4. Corrosion Resistance in Chloride Environments
The NF NC21FeDU Nut exhibits superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride environments:
The NF NC21FeDU Nut exhibits superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride environments:
Sodium Chloride (NaCl) Solution:
Concentration ≤3.5%, temperature ≤200°C: No pitting or crevice corrosion.
Concentration ≤10%, temperature ≤100°C: Corrosion rate <0.01 mm/year.
Concentration ≤3.5%, temperature ≤200°C: No pitting or crevice corrosion.
Concentration ≤10%, temperature ≤100°C: Corrosion rate <0.01 mm/year.
Seawater Environment:
Temperature ≤50°C: Corrosion rate <0.02 mm/year.
Temperature ≤100°C: Corrosion rate <0.05 mm/year.
Temperature ≤50°C: Corrosion rate <0.02 mm/year.
Temperature ≤100°C: Corrosion rate <0.05 mm/year.
Stress Corrosion Cracking (SCC):
In environments with chloride concentration ≤1000 ppm and temperature ≤200°C, no stress corrosion cracking occurs.
In environments with chloride concentration ≤1000 ppm and temperature ≤200°C, no stress corrosion cracking occurs.
The NF NC21FeDU Nut performs exceptionally well in chloride environments, making it suitable for applications in marine engineering and chemical equipment.
5. Summary
The NF NC21FeDU Nut demonstrates outstanding corrosion resistance in strong acid, alkali, and chloride environments, with corrosion rates significantly below industry standards. Through optimized chemical composition and microstructure, the NF NC21FeDU Nut further enhances its corrosion resistance, meeting the high-reliability requirements of extreme environments.
The NF NC21FeDU Nut demonstrates outstanding corrosion resistance in strong acid, alkali, and chloride environments, with corrosion rates significantly below industry standards. Through optimized chemical composition and microstructure, the NF NC21FeDU Nut further enhances its corrosion resistance, meeting the high-reliability requirements of extreme environments.
When selecting fasteners for demanding applications, the NF NC21FeDU Nut is a reliable choice, offering exceptional performance under the most challenging conditions.
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