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UNS S32550 Fastener
QS Fastener: UNS S32550 Fastener
Name: UNS S32550 Fastener
Standard: ANSI, DIN, UNS, ASTM
Material: S32550
Size: 5/16 to 4 inch
Length: 30 to 3000 mm
Grade: A
Class: 12.9
Application: Marine engineering, Chemical and Petroleum Industries, Desalination and Water Treatment, Energy Industry, Food and Pharmaceutical Industry
Standard: ANSI, DIN, UNS, ASTM
Material: S32550
Size: 5/16 to 4 inch
Length: 30 to 3000 mm
Grade: A
Class: 12.9
Application: Marine engineering, Chemical and Petroleum Industries, Desalination and Water Treatment, Energy Industry, Food and Pharmaceutical Industry
Quantity
UNS S32550 Fastener is a high-performance corrosion-resistant fastening solution. Manufactured to ANSI, DIN, UNI, and ASTM standards using super duplex stainless steel S32550 material, this product delivers exceptional strength (Grade 12.9) and outstanding resistance to chloride stress corrosion cracking. As a premium UNS S32550 Fastener, it covers sizes from 5/16"to 4"(30-3000mm lengths) with Grade A quality assurance, making it ideal for marine engineering, petrochemical energy, desalination, and food/pharmaceutical industries. Its superior performance in high-pressure, high-salinity, and acidic environments positions it as the advanced alternative to traditional 316L materials.
One of the core advantages of UNS S32550 Fastener lies in its exceptional mechanical properties - particularly high yield strength and superior fatigue life - enabling lightweight designs without compromising long-term reliability in demanding applications.
(1) Ultra-High Strength: Significant Size and Installation Cost Reduction
UNS S32550 Fastener achieves yield strength ≥550MPa (actual 600-650MPa), far exceeding austenitic stainless steel 316L (205MPa) and standard duplex 2205 (450MPa). This strength delivers direct benefits:
- Size reduction: Under identical load requirements, UNS S32550 Fastener diameters can be 30-40% smaller than 316L equivalents. Example: An M20 316L bolt can be replaced with an M14 UNS S32550 Fastener.
UNS S32550 Fastener achieves yield strength ≥550MPa (actual 600-650MPa), far exceeding austenitic stainless steel 316L (205MPa) and standard duplex 2205 (450MPa). This strength delivers direct benefits:
- Size reduction: Under identical load requirements, UNS S32550 Fastener diameters can be 30-40% smaller than 316L equivalents. Example: An M20 316L bolt can be replaced with an M14 UNS S32550 Fastener.
- Weight savings: Compact designs reduce structural weight - critical for offshore platforms and aerospace applications. In offshore wind turbine flange connections, UNS S32550 Fastener reduces tower loads by over 15%.
(2) Fatigue Life: Long-Term Performance Under Dynamic Loads
The dual-phase microstructure (austenite+ferrite) of UNS S32550 Fastener provides exceptional fatigue resistance:
- High fatigue limit: At 10⁷ cycles, UNS S32550 Fastener maintains 40-50% of tensile strength (320-400MPa) versus 316L's 25-30% (120-150MPa).
The dual-phase microstructure (austenite+ferrite) of UNS S32550 Fastener provides exceptional fatigue resistance:
- High fatigue limit: At 10⁷ cycles, UNS S32550 Fastener maintains 40-50% of tensile strength (320-400MPa) versus 316L's 25-30% (120-150MPa).
- Slow crack propagation: The duplex structure effectively impedes crack growth with critical stress intensity factor (KIC) ≥100 MPa·√m - 70% higher than 316L (~60 MPa·√m).
(3) Proven Engineering Benefits
In a Norwegian subsea pipeline project, original M24 316L bolts requiring frequent replacement due to chloride SCC were replaced with M16 UNS S32550 Fastener, achieving:
- Cost savings: 20% higher bolt cost offset by 35% lower total installation costs (reduced drilling and labor).
In a Norwegian subsea pipeline project, original M24 316L bolts requiring frequent replacement due to chloride SCC were replaced with M16 UNS S32550 Fastener, achieving:
- Cost savings: 20% higher bolt cost offset by 35% lower total installation costs (reduced drilling and labor).
- Extended service life: 5+ years without failure versus 316L's average 18-month replacement cycle.
Conclusion: The combined strength and fatigue resistance of UNS S32550 Fastener make it ideal for dynamic loading, lightweight designs, and low-maintenance applications. While duplex 2205 offers cost savings for less demanding environments, UNS S32550 Fastener remains the superior solution for extreme conditions (deep sea or H₂S presence).
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