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UNS S32750 Fastener
QS Fastener: UNS S32750 Fastener
Name: UNS S32750 Fastener
Standard: ANSI, DIN, UNS, ASTM
Material: 2507
Size: M8 to M100
Length: 30 to 3000 mm
Grade: A
Class: 12.9
Application: Used for Chemical Processing, Petrochemicals and Subsea Equipment
Standard: ANSI, DIN, UNS, ASTM
Material: 2507
Size: M8 to M100
Length: 30 to 3000 mm
Grade: A
Class: 12.9
Application: Used for Chemical Processing, Petrochemicals and Subsea Equipment
Quantity
UNS S32750 Fastener is manufactured from highly corrosion-resistant 2507 duplex stainless steel (UNS S32750), complying with international standards such as ANSI, DIN, and ASTM. Available in sizes ranging from M8 to M100 and lengths from 30 to 3000 mm with a strength class of Class 12.9/A, UNS S32750 Fastener offers exceptional strength and resistance to chloride stress corrosion cracking. This makes it an ideal choice for demanding environments in chemical processing, petrochemical, and subsea equipment, providing a reliable solution for high-temperature, high-pressure, and highly corrosive conditions.
Ultra-High Strength Characteristics
The super duplex stainless steel 2507 used in UNS S32750 Fastener is the preferred material for high-load applications due to its ultra-high strength. With a tensile strength ≥800 MPa, it significantly outperforms conventional austenitic stainless steels (e.g., 316L, ~520 MPa) and standard duplex steels (e.g., 2205, ~620 MPa). This unique property gives UNS S32750 Fastener an irreplaceable advantage in oil & gas, chemical, and marine engineering applications.
The super duplex stainless steel 2507 used in UNS S32750 Fastener is the preferred material for high-load applications due to its ultra-high strength. With a tensile strength ≥800 MPa, it significantly outperforms conventional austenitic stainless steels (e.g., 316L, ~520 MPa) and standard duplex steels (e.g., 2205, ~620 MPa). This unique property gives UNS S32750 Fastener an irreplaceable advantage in oil & gas, chemical, and marine engineering applications.
1. Source of Material Strength
The strength of UNS S32750 Fastener stems from its duplex microstructure (~50% austenite + ~50% ferrite) and high-alloy composition (Cr 24-26%, Ni 6-8%, Mo 3-4%, N 0.24-0.32%). Nitrogen enhances solid solution strengthening, significantly improving yield and tensile strength, while grain refinement and the ferritic phase synergistically enhance mechanical properties.
The strength of UNS S32750 Fastener stems from its duplex microstructure (~50% austenite + ~50% ferrite) and high-alloy composition (Cr 24-26%, Ni 6-8%, Mo 3-4%, N 0.24-0.32%). Nitrogen enhances solid solution strengthening, significantly improving yield and tensile strength, while grain refinement and the ferritic phase synergistically enhance mechanical properties.
2. Strength Comparison with Common Stainless Steels
| Material | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| 2507 | ≥800 | ≥550 | ≥15 |
| 2205 (S32205) | ≥620 | ≥450 | ≥25 |
| 316L | ≥520 | ≥210 | ≥40 |
| 304 | ≥515 | ≥205 | ≥40 |
UNS S32750 Fastener exhibits 54% higher tensile strength than 316L and 30% higher than 2205 duplex steel, enabling it to withstand greater tensile, shear, and torsional loads.
3. Application Advantages in High-Load Environments
(1) Oil & Gas Industry
In deepwater Christmas trees and high-pressure pipeline flanges, UNS S32750 Fastener can withstand preloads exceeding 80 MPa, preventing creep or stress relaxation issues common with standard bolts.
(1) Oil & Gas Industry
In deepwater Christmas trees and high-pressure pipeline flanges, UNS S32750 Fastener can withstand preloads exceeding 80 MPa, preventing creep or stress relaxation issues common with standard bolts.
(2) Chemical Equipment
For reactors and high-pressure heat exchangers, UNS S32750 Fastener combines high strength with corrosion resistance, preventing material degradation from aggressive media.
For reactors and high-pressure heat exchangers, UNS S32750 Fastener combines high strength with corrosion resistance, preventing material degradation from aggressive media.
(3) Marine Engineering
The high fatigue strength of UNS S32750 Fastener (fatigue limit reaching 40-50% of tensile strength) resists wave impact and vibration fatigue, extending service life.
The high fatigue strength of UNS S32750 Fastener (fatigue limit reaching 40-50% of tensile strength) resists wave impact and vibration fatigue, extending service life.
4. Design Optimization and Weight Reduction
By using UNS S32750 Fastener, engineers can achieve:
- Diameter optimization: An M12 UNS S32750 Fastener can replace an M16 316 bolt, saving space and weight.
- Reduced quantity: Higher load capacity per bolt simplifies assembly complexity.
- Extended maintenance intervals: High strength minimizes bolt deformation risks and seal failure.
By using UNS S32750 Fastener, engineers can achieve:
- Diameter optimization: An M12 UNS S32750 Fastener can replace an M16 316 bolt, saving space and weight.
- Reduced quantity: Higher load capacity per bolt simplifies assembly complexity.
- Extended maintenance intervals: High strength minimizes bolt deformation risks and seal failure.
5. Comparison with Other High-Performance Materials
Compared to nickel-based alloys (e.g., Inconel 625) or titanium, UNS S32750 Fastener offers distinct advantages:
- Cost: Priced at ~1/3 of Inconel 625 while offering comparable strength (Inconel 625 tensile strength ≥930 MPa).
- Manufacturability: Supports cold heading, enabling higher production efficiency than hot-worked nickel alloys.
Compared to nickel-based alloys (e.g., Inconel 625) or titanium, UNS S32750 Fastener offers distinct advantages:
- Cost: Priced at ~1/3 of Inconel 625 while offering comparable strength (Inconel 625 tensile strength ≥930 MPa).
- Manufacturability: Supports cold heading, enabling higher production efficiency than hot-worked nickel alloys.
6. Balancing Strength and Corrosion Resistance
With high chromium, molybdenum, and nitrogen content (PREN≥40), UNS S32750 Fastener resolves the"strength-corrosion"trade-off, outperforming martensitic stainless steels.
With high chromium, molybdenum, and nitrogen content (PREN≥40), UNS S32750 Fastener resolves the"strength-corrosion"trade-off, outperforming martensitic stainless steels.
Conclusion
UNS S32750 Fastener delivers ultra-high strength, exceptional corrosion resistance, and cost-effectiveness, making it the ultimate solution for extreme operating conditions. Whether replacing traditional stainless steels or optimizing designs, UNS S32750 Fastener achieves the perfect balance of performance and economy.
UNS S32750 Fastener delivers ultra-high strength, exceptional corrosion resistance, and cost-effectiveness, making it the ultimate solution for extreme operating conditions. Whether replacing traditional stainless steels or optimizing designs, UNS S32750 Fastener achieves the perfect balance of performance and economy.
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