Duplex and Super Duplex UNS S31803 Hex Bolts

The Duplex and Super Duplex UNS S31803 Hex Bolts, along with corresponding Stud Bolts and Threaded Rods, are vital components in industries demanding an optimal blend of high mechanical strength and exceptional corrosion resistance. Zeron Fasteners is a dedicated manufacturer of these high-performance fasteners, specializing in Duplex UNS S31803 (Grade F51/2205) and Super Duplex UNS S32750/S32760 (Grade F53/F55). The duplex microstructure provides a yield strength almost double that of conventional stainless steels, making them ideal for high-stress applications. Crucially, they offer superior resistance to chloride stress corrosion cracking (SCC) and pitting in aggressive chloride-containing environments. Our Hex Bolts are manufactured from forged or bar stock material, complying with standards like ASTM A182 (forged) or ASTM A479 (bar stock), and dimensional specifications like ASME B18.2.1 and DIN 931/933. These fasteners are indispensable for securing flanged connections (including Duplex S31803 Flanges) and structural assemblies in sectors such as offshore oil and gas, marine engineering, desalination plants, and chemical processing.

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Duplex S32205 Hex Bolts Super Duplex S32750 Stud Bolts Duplex S32205 Flanges Super Duplex S32750 Flanges SS 316L Hex Bolts ASTM A193 B8M Hex Bolts Duplex S32205 Pipe Fittings Duplex S31803 Threaded Rods
UNS S31803 Hex Bolts

Duplex (UNS S31803/F51) Hex Bolt Specifications

Specification Details
Material Grade Duplex Steel UNS S31803 (Equivalent to ASTM A182 Grade F51)
Dimensional Standards ANSI/ASME B18.2.1, DIN 931, DIN 933, ISO 4014, ISO 4017
Related Components Stud Bolts (ASTM A193), Hex Nuts (ASTM A194), Washers (ASTM F436)
Coating/Finish Options Self-Color, Hot Dip Galvanized (HDG), PTFE/Xylan Coating, Zinc Plating
Head Style Hex Head, Heavy Hex Head

Duplex S31803 (F51) Chemical Composition (Condensed)

Element Range (%)
Chromium (Cr) 21.0 to 23.0
Nickel (Ni) 4.5 to 6.5
Molybdenum (Mo) 2.5 to 3.5
Nitrogen (N) 0.08 to 0.20
PREN Value >= 32

Duplex S31803 (F51) Mechanical Properties

Property Value (Minimum)
Tensile Strength 620 MPa (90,000 psi)
Yield Strength (0.2% Offset) 415 MPa (60,000 psi)
Elongation 25%
Hardness Max 293 HBW
Density 7.8 g/cm3 (0.282 lb/in3)

Features Product

Super Duplex UNS S32750 Nuts SS 304 Weld Neck Flanges ASTM A193 B8M Stud Bolts Inconel 625 Flanges

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