Duplex and Super Duplex UNS S32760 U-Bolts and J-Bolts

The Duplex and Super Duplex UNS S32760 U-Bolt and J-Bolt are specialized fasteners used primarily in heavy-duty pipe support and structural clamping applications. U-Bolts are curved bolts used to clamp pipework to supports, while J-Bolts are single-ended, J-shaped fasteners used for anchoring. Manufactured from the premium Super Duplex UNS S32760 alloy (also known as F55 or Zeron 100), these components offer a dual advantage: high mechanical strength (significantly higher than standard stainless steels) and exceptional resistance to corrosion. The material's balanced ferritic-austenitic structure and high alloy content, including Tungsten and Copper, provide supreme defense against pitting, crevice corrosion, and chloride stress corrosion cracking (SCC). Due to their robustness, these fasteners are indispensable for securing critical piping and machinery in aggressive environments, such as offshore platforms, marine applications, and chemical processing facilities. Zeron Fasteners manufactures and supplies these specialized bolts, ensuring high quality and conformity to relevant standards.

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UNS S32760 U-Bolts / J-Bolts

Chemical Composition (UNS S32760 / F55)

Element Composition (%)
Chromium (Cr) 24.0 to 26.0
Nickel (Ni) 6.0 to 8.0
Molybdenum (Mo) 3.0 to 4.0
Tungsten (W) 0.5 to 1.0
Copper (Cu) 0.5 to 1.0
Nitrogen (N) 0.20 to 0.30
Carbon (C) Max 0.030
Silicon (Si) Max 1.00
Manganese (Mn) Max 1.00
Phosphorus (P) Max 0.035
Sulfur (S) Max 0.010

Mechanical Properties (UNS S32760 / F55)

Property Minimum Value
Ultimate Tensile Strength 750 MPa Min
Yield Strength (0.2% Proof) 550 MPa Min
Elongation (A) 15 % Min
Hardness (HBW Max) 270
Pitting Resistance Equivalent Number (PREN) 40 Min

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