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UNS N07750 Special Fastener
QS Fastener: UNS N07750 Special Fastener
Name: UNS N07750 Special Fastener
Material: N07750
Standard: ANSI, DIN, NF
Product Grade: A
Size: 5/16 to 4 inch
Strength of Extension: 910 N/mm²
Length: 30 to 800 mm
Feature: Good Corrosion Resistance and Oxidation Resistance
Application: Very Widely Used
Material: N07750
Standard: ANSI, DIN, NF
Product Grade: A
Size: 5/16 to 4 inch
Strength of Extension: 910 N/mm²
Length: 30 to 800 mm
Feature: Good Corrosion Resistance and Oxidation Resistance
Application: Very Widely Used
Quantity
UNS N07750 Special Fastener is manufactured from high-performance N07750 material, with sizes ranging from 5/16 to 4 inches and lengths covering 30 to 800 mm. It boasts a tensile strength of up to 910 N/mm². The product complies with ANSI, DIN, and NF standards, offering excellent corrosion resistance and oxidation resistance, making it widely used in aerospace, petrochemical, nuclear energy, and high-temperature, high-pressure environments. The exceptional mechanical properties and durability of UNS N07750 Special Fastener ensure reliable performance under extreme operating conditions, making it an indispensable high-end fastening solution in industrial equipment, providing long-term stable safety for your engineering projects.
Inconel X-750 is a nickel-based high-temperature alloy, with its high-temperature resistance being one of its core advantages. It can maintain excellent strength and oxidation resistance even at temperatures as high as 815°C.
1. High-Temperature Strength
UNS N07750 Special Fastener retains high strength at elevated temperatures, primarily due to its precipitation strengthening mechanism and stable austenitic matrix.
UNS N07750 Special Fastener retains high strength at elevated temperatures, primarily due to its precipitation strengthening mechanism and stable austenitic matrix.
- Precipitation Strengthening Mechanism: Inconel X-750 forms γ' phase (Ni₃(Al,Ti)) through the addition of aluminum (Al) and titanium (Ti). These precipitates remain stable at high temperatures, providing continuous strengthening.
- At 650°C, the yield strength of UNS N07750 Special Fastener is approximately 600 MPa, and the tensile strength is around 900 MPa.
- At 815°C, its yield strength remains above 400 MPa, and the tensile strength is about 600 MPa, far exceeding that of ordinary stainless steel (e.g., the yield strength of 304 stainless steel at 815°C is only around 50 MPa).
2. High-Temperature Oxidation Resistance
UNS N07750 Special Fastener forms a dense chromium oxide (Cr₂O₃) protective layer at high temperatures, effectively preventing further oxidation.
UNS N07750 Special Fastener forms a dense chromium oxide (Cr₂O₃) protective layer at high temperatures, effectively preventing further oxidation.
Oxidation Resistance Mechanism:
- The high chromium content (14-17%) ensures rapid formation and stability of the oxide layer.
- The high chromium content (14-17%) ensures rapid formation and stability of the oxide layer.
- The addition of nickel (Ni) and iron (Fe) further enhances the adhesion and density of the oxide layer.
- After 1000 hours of exposure in air at 815°C, the oxidation weight gain of UNS N07750 Special Fastener is only 0.1 mg/cm², indicating an extremely low oxidation rate.
- In comparison, ordinary stainless steel (e.g., 304 stainless steel) under the same conditions exhibits an oxidation weight gain of up to 1.5 mg/cm², with a significantly higher oxidation rate.
3. High-Temperature Creep Resistance
UNS N07750 Special Fastener demonstrates excellent creep resistance under combined high temperature and stress, enduring high stress for extended periods without significant deformation.
UNS N07750 Special Fastener demonstrates excellent creep resistance under combined high temperature and stress, enduring high stress for extended periods without significant deformation.
Creep Resistance Mechanism:
- The stable γ' phase and austenitic matrix effectively inhibit grain boundary sliding and dislocation movement, enhancing the material's creep resistance.
- The stable γ' phase and austenitic matrix effectively inhibit grain boundary sliding and dislocation movement, enhancing the material's creep resistance.
- At 700°C and 200 MPa stress, the creep rupture time of UNS N07750 Special Fastener exceeds 1000 hours.
- In contrast, ordinary stainless steel (e.g., 316 stainless steel) under the same conditions has a creep rupture time of only around 100 hours.
4. High-Temperature Fatigue Performance
UNS N07750 Special Fastener maintains good fatigue performance at high temperatures, enduring cyclic stress without fatigue failure.
Fatigue Mechanism:
- The stable microstructure and precipitation strengthening phases effectively inhibit crack initiation and propagation, improving the material's fatigue life.
UNS N07750 Special Fastener maintains good fatigue performance at high temperatures, enduring cyclic stress without fatigue failure.
Fatigue Mechanism:
- The stable microstructure and precipitation strengthening phases effectively inhibit crack initiation and propagation, improving the material's fatigue life.
- At 650°C and a stress amplitude of 300 MPa, the fatigue life of UNS N07750 Special Fastener exceeds 10⁶ cycles.
- In comparison, ordinary stainless steel (e.g., 304 stainless steel) under the same conditions has a fatigue life of only around 10⁵ cycles.
5. Microstructural Stability at High Temperatures
The microstructure of UNS N07750 Special Fastener exhibits excellent stability at high temperatures, maintaining uniform grain size and precipitate distribution over extended periods.
The microstructure of UNS N07750 Special Fastener exhibits excellent stability at high temperatures, maintaining uniform grain size and precipitate distribution over extended periods.
Mechanism Analysis:
- The high nickel content (≥70%) ensures that the austenitic structure does not undergo phase transformation (e.g., to brittle σ phase or carbide precipitation) at high temperatures.
- The high nickel content (≥70%) ensures that the austenitic structure does not undergo phase transformation (e.g., to brittle σ phase or carbide precipitation) at high temperatures.
- The γ' phase remains stable at high temperatures, providing continuous strengthening.
- After 1000 hours of exposure at 700°C, the microstructure of UNS N07750 Special Fastener shows no significant changes, with grain size and precipitate distribution remaining uniform.
Inconel X-750, with its stable austenitic matrix, precipitation strengthening phases, and excellent oxidation resistance, maintains stable microstructure and mechanical properties even after prolonged use at high temperatures. The high-temperature strength, oxidation resistance, creep resistance, and fatigue performance of UNS N07750 Special Fastener are significantly superior to those of ordinary stainless steel and other high-temperature alloys, making it an ideal material choice for extreme high-temperature environments.
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