Duplex 2205 Bolts
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Sunmach is an ISO 9001:2015 certified manufacturer and global supplier of high-performance Duplex 2205 bolts. With over 13 years of dedicated manufacturing , we produce these duplex stainless steel fasteners using premium raw materials, advanced CNC machining and strict quality processes. These bolts are specifically engineered for demanding applications in offshore oil & gas, desalination plants, chemical processing and marine environments where both high strength and superior corrosion resistance are essential. Duplex 2205 bolts offer nearly twice the strength of 316L stainless steel along with excellent resistance to seawater, chlorides and stress-corrosion cracking. Their balanced microstructure makes them a reliable, long-lasting choice that helps reduce maintenance costs and extend service life in critical installations.
Duplex 2205 (S31803) Bolts
Sunmach is an ISO 9001:2015 certified manufacturer and global supplier of standard Duplex 2205 Bolts, Heavy Hex Bolts, Plugs & Bushings, U Bolts & custom or Special Duplex 2205 Bolts. Apart from Duplex Bolts, We also manufacture bolts from these other special materials such as Super Duplex, Hastelloy® C-276, Hastelloy® C-22, Hastelloy® B-2, Hastelloy® G-30, Inconel® 600, Inconel® 625, Inconel® 718, Stainless Steel 300 Series, Nickel 200, Titanium Grade 2, Titanium Grade 5, Titanium Grade 7 & Monel® 400, Monel® K-500, Special Stainless 904L, Nitronic® 60, 254 SMO, A4-80 Stainless Steel to name few.
To manufacture & timely deliver a precision Standard Duplex 2205 Bolts or Custom Duplex 2205 bolts, apart from adequate inventory, we have advanced machinery, experienced engineering team, R&D; team, Prototyping team, Heat Treatment facility & all required Testing along with the efficient logistic team. All Raw Materials sourced from the most reputable and renowned manufacturers in the world.
Sunmach bolts meet applicable DIN, ISO, ANSI and IS.
Sunmach serves a diverse range of markets including Chemical Processing, Semiconductor, Power Generation, Aerospace, Oil & Gas, Pharmaceutical, Food & Beverage, Marine, Pulp & Paper, Petrochemical & Refining, Air Pollution Control and Water Treatment.
Frequently Asked Questions
Common questions about Sunmach Duplex 2205 Bolts
They are primarily used in high-load, high-pressure and severely corrosive assemblies where standard stainless steel fasteners would experience rapid pitting, crevice corrosion, or structural failure. Typical applications include offshore oil and gas installations, high-pressure seawater desalination piping flanges, chemical reactor vessels and subsea structural connections.
Standard 316L stainless steel has lower yield strength and is highly vulnerable to stress corrosion cracking and crevice corrosion under bolt heads in warm, chloride rich environments. Duplex 2205 Bolts provide nearly double the yield strength of 316L and outstanding resistance to chloride-induced pitting, allowing bolted connections to remain secure for over 30 years of continuous service.
Because Duplex 2205 has a yield strength of approximately 450 MPa, it is significantly stronger than traditional austenitic grades. This high strength to weight ratio allows design engineers to use smaller or fewer bolts to achieve the same clamping force, which reduces overall joint weight, lowers support bearing preloads and reduces material costs.
Our bolts conform strictly to major international specifications, including ASTM, DIN, ISO and ANSI. We manufacture them using solution annealing thermal cycles per ASTM guidelines and provide complete dimensional verification to ensure seamless integration with international piping flanges, pressure vessels and industrial equipment.
Every batch undergoes spectrochemical analysis (ICP/OES) to confirm alloy chemistry, tensile testing to confirm mechanical limits and ASTM G48 corrosion testing to verify pitting and crevice corrosion immunity. We supply each shipment with a complete EN 10204 3.1 Mill Test Certificate (MTC) and a Certificate of Conformance (CoC), ensuring 100% traceability back to the raw material heat number.