Duplex and Super Duplex UNS S31803 Nuts

UNS S31803 Nuts are precision-machined threaded fasteners, fundamental for securing bolts and stud bolts in corrosive industrial environments. Manufactured from Duplex Stainless Steel (Alloy 2205), Zeron Fasteners specializes in supplying these durable nuts, which are highly valued for their outstanding toughness and resistance to stress corrosion cracking in various acidic and alkaline solutions. The key characteristic of this product is its ability to maintain integrity and prevent galling even when paired with Duplex S31803 stud bolts in aggressive media like chloride-bearing seawater. The main application of these UNS S31803 Nuts is in critical high-pressure flange assemblies within marine vessels, chemical processing equipment, and heat exchangers, ensuring the longevity and safety of critical infrastructure.

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UNS S31803 Stud Bolts UNS S31803 Washers UNS S31803 Screws UNS S31803 Threaded Rods UNS S32760 Nuts Duplex S32205 Hex Bolts UNS S31803 Anchor Fasteners
UNS S31803 Nuts

Duplex and Super Duplex UNS S31803 Nuts Chemical Composition

Element Content (%)
Carbon (C) 0.030 max
Manganese (Mn) 2.00 max
Silicon (Si) 1.00 max
Phosphorus (P) 0.030 max
Sulfur (S) 0.020 max
Chromium (Cr) 21.0 – 23.0
Nickel (Ni) 4.5 – 6.5
Molybdenum (Mo) 2.5 – 3.5
Nitrogen (N) 0.08 – 0.20

Duplex and Super Duplex UNS S31803 Nuts Mechanical Properties

Property Value
Tensile Strength (min) 620 MPa (90 ksi)
Yield Strength (0.2% Offset min) 450 MPa (65 ksi)
Elongation in 4D (min) 25%
Hardness (Brinell max) 290 HB

Duplex and Super Duplex UNS S31803 Nuts Products Feature

Superior Corrosion Resistance High Strength Stress Corrosion Cracking Resistance Heavy Duty Flange Bolting

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