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UNS N08904 Fastener
QS Fastener: UNS N08904 Fastener
Name: UNS N08904 Fastener
Standard: ANSI/ASTM, DIN
Material: SS 904L
Size: 5/16 to 4 inch
Length: 30 to 800 mm
Product Grade: A
Tensile Strength(Rm): 490 N/mm²
Elongation: 35%
Feature: High Resistance to Pitting and Stress Corrosion Cracking
Application: For Petroleum and Petrochemical Equipment, etc.
Standard: ANSI/ASTM, DIN
Material: SS 904L
Size: 5/16 to 4 inch
Length: 30 to 800 mm
Product Grade: A
Tensile Strength(Rm): 490 N/mm²
Elongation: 35%
Feature: High Resistance to Pitting and Stress Corrosion Cracking
Application: For Petroleum and Petrochemical Equipment, etc.
Quantity
The UNS N08904 Fastener is made from SS 904L material, compliant with ANSI/ASTM and DIN standards, with sizes ranging from 5/16 to 4 inches and lengths from 30 to 800 mm. It boasts a high tensile strength of 490 N/mm² and an elongation rate of 35%. Its core advantage lies in its exceptional resistance to pitting and stress corrosion cracking, making it particularly suitable for harsh environments such as oil and petrochemical equipment. As a Grade A product, the UNS N08904 Fastener is an ideal choice for highly corrosive industrial applications due to its high reliability and broad applicability.
The high reliability of the UNS N08904 Fastener stems from its unique material properties and precision manufacturing processes, enabling it to maintain stable performance in extreme environments, thereby significantly reducing equipment failure rates and maintenance costs.
1. Material Properties
- Corrosion Resistance: The UNS N08904 Fastener is made from SS 904L, a high-alloy austenitic stainless steel with a chemical composition of 19-23% chromium, 23-28% nickel, 4-5% molybdenum, and 1-2% copper. This high-alloy composition provides excellent corrosion resistance in acidic, alkaline, and chloride environments. For example, in 10% sulfuric acid or 50% phosphoric acid solutions, its corrosion rate is below 0.1 mm/year, far superior to ordinary stainless steels like 316L.
- Corrosion Resistance: The UNS N08904 Fastener is made from SS 904L, a high-alloy austenitic stainless steel with a chemical composition of 19-23% chromium, 23-28% nickel, 4-5% molybdenum, and 1-2% copper. This high-alloy composition provides excellent corrosion resistance in acidic, alkaline, and chloride environments. For example, in 10% sulfuric acid or 50% phosphoric acid solutions, its corrosion rate is below 0.1 mm/year, far superior to ordinary stainless steels like 316L.
- Resistance to Pitting and Crevice Corrosion: With a PREN (Pitting Resistance Equivalent Number) of up to 35, the UNS N08904 Fastener effectively resists pitting and crevice corrosion, making it particularly suitable for marine environments or industrial settings with high chloride ion concentrations.
- Resistance to Stress Corrosion Cracking (SCC): In high-temperature and high-pressure environments, the UNS N08904 Fastener exhibits strong resistance to chloride-induced stress corrosion cracking, making it an excellent choice for oil, petrochemical, and chemical equipment.
2. Mechanical Properties
- High Strength: The UNS N08904 Fastener has a tensile strength of 490-690 N/mm², a yield strength of 220 N/mm², and an elongation rate of 35%. This high strength and good toughness enable it to withstand dynamic loads, vibrations, and impacts, ensuring it does not fracture or deform in harsh environments.
- High Strength: The UNS N08904 Fastener has a tensile strength of 490-690 N/mm², a yield strength of 220 N/mm², and an elongation rate of 35%. This high strength and good toughness enable it to withstand dynamic loads, vibrations, and impacts, ensuring it does not fracture or deform in harsh environments.
- High-Temperature Performance: Below 300°C, the mechanical properties of the UNS N08904 Fastener remain largely unaffected. Even at 400°C, it retains over 80% of its strength.
3. Application Examples
- Oil and Gas Industry: In offshore drilling platforms and refining equipment, the UNS N08904 Fastener resists corrosion from hydrogen sulfide, carbon dioxide, and chlorides, significantly reducing equipment failures and maintenance downtime.
- Oil and Gas Industry: In offshore drilling platforms and refining equipment, the UNS N08904 Fastener resists corrosion from hydrogen sulfide, carbon dioxide, and chlorides, significantly reducing equipment failures and maintenance downtime.
- Chemical Industry: In environments with strong acids, alkalis, and organic solvents, the UNS N08904 Fastener has a service life 50% longer than ordinary stainless steels, reducing replacement frequency and maintenance costs.
The long service life of the UNS N08904 Fastener is the result of the synergistic effects of its corrosion resistance and mechanical properties, enabling it to operate stably for extended periods in harsh environments and delivering significant economic benefits to users.
1. Corrosion Resistance
- Comprehensive Corrosion Resistance: The UNS N08904 Fastener not only exhibits excellent resistance to chlorides, sulfuric acid, and phosphoric acid but also resists corrosion from organic acids (e.g., acetic acid, citric acid) and alkaline solutions. For example, in a 5% hydrochloric acid solution, its corrosion rate is only 0.01 mm/year.
- Comprehensive Corrosion Resistance: The UNS N08904 Fastener not only exhibits excellent resistance to chlorides, sulfuric acid, and phosphoric acid but also resists corrosion from organic acids (e.g., acetic acid, citric acid) and alkaline solutions. For example, in a 5% hydrochloric acid solution, its corrosion rate is only 0.01 mm/year.
- Oxidation Resistance: In high-temperature oxidizing environments, the UNS N08904 Fastener forms a dense chromium oxide layer on its surface, effectively preventing further oxidation. Below 600°C, its oxidation rate is extremely low, making it suitable for long-term high-temperature use.
2. Mechanical Properties
- High Hardness and Wear Resistance: With a hardness of HB 200-220, the UNS N08904 Fastener offers good wear resistance, protecting it from mechanical and fretting wear and extending its service life.
- High Hardness and Wear Resistance: With a hardness of HB 200-220, the UNS N08904 Fastener offers good wear resistance, protecting it from mechanical and fretting wear and extending its service life.
- Fatigue Resistance: Under cyclic loading, the UNS N08904 Fastener has a fatigue strength of 250 N/mm², enabling it to withstand long-term vibrations and impacts without fatigue failure.
3. Service Life Comparison
- Compared to Ordinary Stainless Steel: In the same environment, the UNS N08904 Fastener has a service life 30-50% longer than 316L stainless steel. For example, in marine environments, the average lifespan of 316L fasteners is 5-7 years, while the UNS N08904 Fastener can last 10-15 years.
- Compared to Ordinary Stainless Steel: In the same environment, the UNS N08904 Fastener has a service life 30-50% longer than 316L stainless steel. For example, in marine environments, the average lifespan of 316L fasteners is 5-7 years, while the UNS N08904 Fastener can last 10-15 years.
- Compared to Carbon Steel: In acidic environments, carbon steel fasteners typically last less than 1 year, while the UNS N08904 Fastener can last over 10 years, significantly reducing replacement frequency and costs.
4. Economic Benefits
- Reduced Replacement Frequency: The long service life of the UNS N08904 Fastener reduces replacement frequency, lowering material and labor costs.
- Reduced Replacement Frequency: The long service life of the UNS N08904 Fastener reduces replacement frequency, lowering material and labor costs.
- Lower Maintenance Costs: Its high reliability and corrosion resistance significantly reduce maintenance frequency, minimizing downtime and maintenance expenses.
- Improved Equipment Efficiency: Long-term stable performance ensures efficient equipment operation, enhancing productivity and economic benefits.
The UNS N08904 Fastener, with its exceptional corrosion resistance, high strength, and long service life, performs outstandingly in harsh environments, significantly reducing equipment failures and maintenance costs. Its superior properties make it an ideal choice for industries such as oil, chemicals, and marine engineering, providing users with long-term reliability and economic benefits.
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