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UNS S32750 Nut
QS Fastener: UNS S32750 Nut
Name: UNS S32750 Nut
Standard: ANSI, DIN, UNS, ASTM
Material: 2507
Size: 5/16 to 4 inch
Grade: A
Class: 12.0
Application: Used for Chemical Processing, Petrochemicals and Subsea Equipment
Standard: ANSI, DIN, UNS, ASTM
Material: 2507
Size: 5/16 to 4 inch
Grade: A
Class: 12.0
Application: Used for Chemical Processing, Petrochemicals and Subsea Equipment
Quantity
The UNS S32750 Nut is manufactured from super duplex stainless steel 2507 (UNS S32750), complying with international standards such as ANSI, DIN, and ASTM. Available in sizes ranging from 5/16 to 4 inches with a strength grade of 12.0, this product stands out for its exceptional corrosion resistance, high mechanical strength, and resistance to stress cracking, making it the ideal choice for demanding applications in chemical processing, petroleum, and deep-sea equipment.
Why Choose UNS S32750 Nut?
Super duplex stainless steel 2507 (UNS S32750) boasts a PREN≥40, significantly outperforming traditional austenitic stainless steels (e.g., 904L, 316L) and 6Mo super austenitic steels (e.g., 254SMO). The UNS S32750 Nut is particularly suited for high-chloride, acidic, and high-temperature corrosive environments, offering industry-leading resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion.
Super duplex stainless steel 2507 (UNS S32750) boasts a PREN≥40, significantly outperforming traditional austenitic stainless steels (e.g., 904L, 316L) and 6Mo super austenitic steels (e.g., 254SMO). The UNS S32750 Nut is particularly suited for high-chloride, acidic, and high-temperature corrosive environments, offering industry-leading resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion.
1. Resistance to Chloride Stress Corrosion Cracking (SCC)
SCC is a critical weakness of austenitic stainless steels (e.g., 304, 316), but the UNS S32750 Nut, thanks to its duplex structure, is inherently resistant:
- Critical SCC Temperature Comparison:
- 316L: <50°C (may fail at 50 ppm Cl⁻)
- 904L: <80°C
- UNS S32750 Nut: >120°C (remains stable even in saturated brine)
SCC is a critical weakness of austenitic stainless steels (e.g., 304, 316), but the UNS S32750 Nut, thanks to its duplex structure, is inherently resistant:
- Critical SCC Temperature Comparison:
- 316L: <50°C (may fail at 50 ppm Cl⁻)
- 904L: <80°C
- UNS S32750 Nut: >120°C (remains stable even in saturated brine)
- Real-World Case:
- On offshore platforms, the UNS S32750 Nut exceeds 20 years of service life in seawater at 90°C, while 316L nuts typically fail within 1-2 years.
- On offshore platforms, the UNS S32750 Nut exceeds 20 years of service life in seawater at 90°C, while 316L nuts typically fail within 1-2 years.
2. Pitting and Crevice Corrosion Resistance
The UNS S32750 Nut has proven its superior performance in ASTM G48 testing:
- Critical Pitting Temperature (CPT):
- 316L: <15°C | 904L: ~35°C | UNS S32750 Nut: ≥50°C
The UNS S32750 Nut has proven its superior performance in ASTM G48 testing:
- Critical Pitting Temperature (CPT):
- 316L: <15°C | 904L: ~35°C | UNS S32750 Nut: ≥50°C
- Critical Crevice Corrosion Temperature (CCT):
- 316L: <10°C | 254SMO: ~40°C | UNS S32750 Nut: ≥45°C
- 316L: <10°C | 254SMO: ~40°C | UNS S32750 Nut: ≥45°C
- Performance in Applications:
- In seawater cooling systems, the UNS S32750 Nut reduces pitting rates by 90% compared to 316L, maintaining a smooth surface even after prolonged use.
- In seawater cooling systems, the UNS S32750 Nut reduces pitting rates by 90% compared to 316L, maintaining a smooth surface even after prolonged use.
3. Comparison with 904L/6Mo Stainless Steels
| Corrosion Type | Advantage of UNS S32750 Nut | Limitation of 904L/6Mo |
| Chloride SCC | Stable up to 120°C | 904L may fail above 80°C |
| Acidic Environments (H₂S) | NACE MR0175 certified, H₂S resistant | 904L corrodes rapidly at pH<3 |
4. Adaptability to Extreme Environments
- Acidic Oil & Gas Fields: The UNS S32750 Nut is NACE MR0175 certified, suitable for harsh conditions with H₂S partial pressure >0.3 psi.
- Microbial Corrosion (MIC): High molybdenum (Mo≥3.5%) and nitrogen (N≥0.24%) content provides better MIC resistance than conventional stainless steels.
- Acidic Oil & Gas Fields: The UNS S32750 Nut is NACE MR0175 certified, suitable for harsh conditions with H₂S partial pressure >0.3 psi.
- Microbial Corrosion (MIC): High molybdenum (Mo≥3.5%) and nitrogen (N≥0.24%) content provides better MIC resistance than conventional stainless steels.
5. Economic Advantages
Compared to 254SMO (6Mo), the UNS S32750 Nut reduces costs by 20-30% while offering higher tensile strength (800 MPa vs. 650 MPa), making it the optimal balance between performance and budget.
Compared to 254SMO (6Mo), the UNS S32750 Nut reduces costs by 20-30% while offering higher tensile strength (800 MPa vs. 650 MPa), making it the optimal balance between performance and budget.
Conclusion
With its PREN≥40, comprehensive corrosion resistance, and cost-effectiveness, the UNS S32750 Nut is the ultimate fastener solution for extreme environments in oil & gas, chemical processing, and marine engineering.
With its PREN≥40, comprehensive corrosion resistance, and cost-effectiveness, the UNS S32750 Nut is the ultimate fastener solution for extreme environments in oil & gas, chemical processing, and marine engineering.
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