Hardness testing to ISO 6508-1
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Vision Alloys is a leading Duplex Steel UNS S31803 Fasteners manufacturer and supplier in Mumbai, India. We provide high-quality fastening solutions that are designed to operate effectively in high-stress and corrosive environments. Additionally, we offer custom fasteners that are customized to meet the unique requirements of each project, as well as Duplex Steel nuts and bolts, washers, and studs. Petrochemical, marine, offshore, and construction industries rely on these fasteners. Vision Alloys is a reputable brand in precision-engineered Duplex fasteners, boasting a global presence and years of experience.
We manufacture our Duplex Steel S31803 bolts and nuts from nitrogen-enhanced duplex stainless steel. This material combines the benefits of ferritic and austenitic grades. The chemical makeup includes about 22% chromium, 5–6% nickel, 3% molybdenum, and nitrogen. This gives the fasteners excellent resistance to pitting, stress corrosion cracking, and fatigue. Our products meet global standards such as ASTM A182, ASTM A479, ASME SA182, and EN 1.4462. They fall under HSN Code 731815, making them suitable for international documentation and shipping.
In both marine and industrial environments, these UNS S31803 duplex nut and bolt fasteners are extensively employed in heat exchangers, pipelines, desalination plants, offshore platforms, pressure vessels, and structural projects. We supply various types, like hex bolts, hex nuts, heavy hex nuts, threaded rods, flat washers, lock nuts, and stud bolts. The sizes of Duplex S31803 fasteners are M6 to M64, with lengths up to 200mm or more depending on type. We provide threading options that include UNC, UNF, and metric courses. Additionally, imperial versions are available upon request. Custom dimensions and coatings are accessible for applications that necessitate them.
All of our fasteners, including Duplex Steel bolts, nuts, and washers, undergo rigorous testing to ensure dimensional accuracy, corrosion resistance, hardness, and tensile strength. We certify each item and provide mill test reports, third-party inspections, and quality documents for seamless project approvals. Duplex nut bolt prices typically range from $0.20 to $12 per piece depending on size, grade, finish, and quantity. Bulk discounts and project-based pricing are available for orders with a large volume. To shorten lead times, advanced production facilities and readily available stock are used.
We serve clients in the United States, Europe, Southeast Asia, and North America as a trusted S31803 Duplex Steel fasteners exporter. Our export-grade packaging guarantees punctual delivery and zero transit damage. Whether you need standard Duplex bolts and nuts or custom-designed fasteners, Vision Alloys delivers with precision and speed. For samples, datasheets, or a competitive quotation tailored to your project specifications, please contact our technical team today. We have arrived to assist you in the construction of a more robust, efficient, and intelligent structure.
Standards | ASTM A479, ASME SA479 |
Standard | DIN, ASTM, BS and all International Standards |
Size | M3 to M90 |
Length | 10mm to 1000mm |
Washers Size | M3 - M56 | 3/6" to 2" | Custom Sizes |
Type | Bolts, Nuts, Sockets, Screws, Screw, Studs, Socket Screw, Hex Set Screw, Cap Screw, Machine Screw, Pan Head Screw, Allen Cap screw, Socket Head Cap Screw, Wing Screw, Spring Washers, Washers, Studs, Marine Anchors, Anchors, Hexagon Nut, Nut, Hex Coupling Nut, Hex Nut, Square Nut, Hex Domed Cap Nuts, Hex Head Bolts, Stud Bolts, Socket Hexagon Head Screw,U- Bolts, Anchor Bolt, Mushroom Head Square Neck Bolts, J Bolts, Wing Screw, T-Head Bolts, Foundation Bolts, Eye Bolt,Structural Bolts. |
To preserve the high standards of our selection of industrial fasteners, we have always adhered to a systematic quality management process.
Our staff of experts is vibrant and talented, and they have always been our largest supporters and contributors to our success. Our vision is to create a world of fasteners.
STANDARD | UNS | WERKSTOFF NR. |
---|---|---|
ASTM A479 F51 | S31803 | 1.4462 |
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
---|---|---|---|---|---|---|---|---|---|---|
S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
---|---|---|---|---|---|
S31803 | 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 116000 , MPa – 800 | Psi – 80000 , MPa – 550 | 15 % |
Hardness testing to ISO 6508-1
Nut proof load testing to ISO 898-2
Suitability for preloading to EN 14399-2
Calibrated gauges and tools
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