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UNS S32550 Hex Bolt
QS: UNS S32550 Hex Bolt
Name: UNS S32550 Hex Bolt
Standard: UNS, ANSI, DIN, ASTM
Material: S32550
Size: M8 to M30
Lenght: 30 to 1000 mm
Grade: A
Class: 12.9
Application: Marine engineering, Chemical and Petroleum Industries, Desalination and Water Treatment, Energy Industry, Food and Pharmaceutical Industry
Standard: UNS, ANSI, DIN, ASTM
Material: S32550
Size: M8 to M30
Lenght: 30 to 1000 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 Hex Bolt is manufactured from high-strength duplex stainless steel S32550 (UNS standard), compliant with international standards such as ASTM, ANSI, and DIN. Available in sizes ranging from M8 to M30 and lengths of 30–1000 mm, it meets performance Class 12.9. With exceptional corrosion resistance (especially against chloride stress corrosion) and mechanical strength, it is designed for demanding environments and widely used in marine engineering, petrochemical energy, seawater desalination, and food/pharmaceutical industries, making it the ideal choice for durability and safety.
Why Choose UNS S32550 Hex Bolt?
UNS S32550 Hex Bolt offers significant advantages in harsh industrial environments due to its unique duplex stainless steel structure and optimized alloy composition, outperforming conventional austenitic stainless steels (e.g., 316L) in lifespan, safety, and lightweight design.
UNS S32550 Hex Bolt offers significant advantages in harsh industrial environments due to its unique duplex stainless steel structure and optimized alloy composition, outperforming conventional austenitic stainless steels (e.g., 316L) in lifespan, safety, and lightweight design.
(1) Extended Lifespan: UNS S32550 Hex Bolt Provides 3–5x Better Chloride Corrosion Resistance
① Material Science Comparison
- Limitations of 316L Bolts:
- 316L (UNS S31603) is austenitic stainless steel with a PREN of only 25–28, showing rust in salt spray environments within 200–500 hours.
① Material Science Comparison
- Limitations of 316L Bolts:
- 316L (UNS S31603) is austenitic stainless steel with a PREN of only 25–28, showing rust in salt spray environments within 200–500 hours.
- Breakthrough of UNS S32550 Hex Bolt:
- PREN exceeds 40, and its duplex structure blocks corrosion crack propagation.
- PREN exceeds 40, and its duplex structure blocks corrosion crack propagation.
② Test Data
- Salt Spray Test: UNS S32550 shows no red rust after 1,000 hours, far surpassing 316L.
- Case Study: UNS S32550 Hex Bolts used in offshore wind turbine towers remain corrosion-free after 8 years.
- Salt Spray Test: UNS S32550 shows no red rust after 1,000 hours, far surpassing 316L.
- Case Study: UNS S32550 Hex Bolts used in offshore wind turbine towers remain corrosion-free after 8 years.
Conclusion: UNS S32550 lasts 3–5 times longer than 316L in chloride-rich environments.
(2) Enhanced Safety: UNS S32550 Hex Bolt Complies with NACE MR0175 Certification
① Oil & Gas Requirements
- Bolts in acidic environments are prone to hydrogen embrittlement and fracture.
① Oil & Gas Requirements
- Bolts in acidic environments are prone to hydrogen embrittlement and fracture.
② UNS S32550 Hex Bolt Solution:
- Hardness HRC < 38; duplex structure inhibits hydrogen diffusion.
- Tested KISSC ≥ 30 MPa√m, meeting API 6A standards.
- Hardness HRC < 38; duplex structure inhibits hydrogen diffusion.
- Tested KISSC ≥ 30 MPa√m, meeting API 6A standards.
Industry Application: Widely used in high-risk applications like subsea Christmas trees.
(3) Lightweight Design: UNS S32550 Hex Bolt Enables 60% Weight Reduction
① Strength Comparison
- 316L tensile strength: 515 MPa vs. UNS S32550: 1,220 MPa.
① Strength Comparison
- 316L tensile strength: 515 MPa vs. UNS S32550: 1,220 MPa.
② Weight Reduction Case
- Under the same load, UNS S32550 Hex Bolt reduces weight by 60%, improving sealing performance.
- Under the same load, UNS S32550 Hex Bolt reduces weight by 60%, improving sealing performance.
Summary: The Unmatched Advantages of UNS S32550 Hex Bolt
| Comparison | 316L Bolt | UNS S32550 Hex Bolt |
| Corrosion Resistance | 200–500 hours salt spray life | 1,000+ hours lifespan |
| H₂S Resistance | Not suitable for sour service | NACE MR0175 certified |
| Strength | 515 MPa | 1,220 MPa (Class 12.9) |
Choosing UNS S32550 Hex Bolt ensures longer service life, higher safety, and lower total lifecycle costs.
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