High Quality Duplex Steel S31803/S32205 Fasteners
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Ratnadeep Steel & Engg. Co. is a leading manufacturer, exporter, and supplier of premium-quality Duplex Steel S31803/S32205 Fasteners. Manufactured from high-strength duplex stainless steel using advanced production processes, our fasteners ensure superior corrosion resistance, excellent strength, and long-term reliability for critical applications requiring durability and performance in demanding environments.
Duplex Steel S31803 and S32205 fasteners are widely preferred for their exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride-rich and aggressive media. They offer a balanced combination of high mechanical strength and corrosion resistance, making them suitable for high-pressure and highly corrosive service conditions. Their duplex microstructure provides enhanced durability compared to standard austenitic grades.
With precise threading, smooth surface finishes, and tight tolerances, our Duplex Steel S31803/S32205 fasteners deliver reliable performance under vibration, heavy loads, and corrosive exposure. They are ideal for offshore oil & gas, chemical processing, marine applications, desalination plants, power generation, and general industrial applications.
Our Range of Duplex Steel UNS S31803 / 2205 Industrial Fasteners
- Duplex Steel S31803 / S32205 Hex & Heavy Hex Nuts
- Lock Nuts, Nylon Insert & Coupling Nuts
- DIN 1.4462 Duplex Steel Precision Machined Nuts
- High strength with excellent resistance to chloride corrosion
- ASTM A182 Duplex Steel S31803 / S32205 Bolts
- Hex, Heavy Hex, Machine & Structural Bolts
- DIN 1.4462 Duplex Steel High-Strength Bolting
- Ideal for offshore, marine and chemical processing systems
- ASTM A182 Duplex Steel Socket Head Cap Screws
- Button Head, Hex Head & Set Screw Configurations
- UNS S31803 / S32205 Duplex Steel Grades
- High torque strength with superior corrosion resistance
- Duplex Steel S31803 / S32205 Plain & Spring Washers
- Split, Ogee & Dock Washers as per DIN standards
- Ensures load distribution and joint stability
- Suitable for corrosive and high-load environments
- ASTM A182 Duplex Steel Stud Bolts
- Single Ended, Double Ended & Fully Threaded Studs
- UNS S31803 / S32205 for pressure applications
- Used in flanges, valves and offshore piping systems
- ASTM A182 Duplex Steel Threaded Rods
- Fully Threaded and Cut-to-Length Stud Rods
- DIN 1.4462 Duplex Steel Tie Rods
- Excellent strength-to-weight ratio for structural use
S31803 / S32205 DUPLEX STEEL ASTM A182 FASTENERS EQUIVALENT GRADES
| Standard | UNS | WNR. |
|---|---|---|
| Duplex Steel 2205 | S31803 / S32205 | 1.4462 |
SPECIFICATION OF DUPLEX STEEL FASTENERS
| Specification | ASTM A479, ASTM A182 / ASME SA479, SA182 |
|---|---|
| Dimension Standards | DIN, ISO, ASTM, JIS, BS, GB, IS and all International Standards |
| Size Range | M3 – M56 | 3/6" to 2" | Custom Sizes |
| Length | 3 mm to 200 mm |
| Types | Nuts, Bolts, Screws, Sockets, Studs, Hex Set Screws, Socket Screws, Cap Screws, Pan Head Screws, Machine Screws, Socket Head Cap Screws, Allen Cap Screws, Wing Screws, Washers, Spring Washers, Anchors, Marine Anchors, Hexagon Nuts, Hex Nuts, Coupling Nuts, Hex Domed Cap Nuts, Square Nuts, Stud Bolts, Hex Head Bolts, Socket Hexagon Head Screw Anchor Bolts, U-Bolts, J-Bolts, Mushroom Head Square Neck Bolts, T-Head Bolts, Eye Bolts, Foundation Bolts, Structural Bolts |
CHEMICAL COMPOSITION OF DUPLEX STEEL S31803 / S32205 INDUSTRIAL FASTENERS
| Grade | Common Name | C% | Mn% | Si% | P% | S% | Cr% | Ni% | Mo% | N% |
|---|---|---|---|---|---|---|---|---|---|---|
| 2205 | S31803 | 0.030 | 2.00 | 1.00 | 0.030 | 0.020 | 21.0 – 23.0 | 4.5 – 6.5 | 2.5 – 3.5 | 0.08 – 0.20 |
| S32205 | 0.030 | 2.00 | 1.00 | 0.030 | 0.020 | 22.0 – 23.0 | 4.5 – 6.5 | 3.0 – 3.5 | 0.14 – 0.20 |
MECHANICAL PROPERTIES OF ASME SA182 DUPLEX STEEL BOLTS & NUTS
| Tensile Strength (ksi) | 90 min |
|---|---|
| 0.2% Yield Strength (ksi) | 65 min |
| Elongation (%) | 25 min |
| Hardness (HRC) | 293 max |
PHYSICAL PROPERTIES OF UNS S31803 / S32205 DUPLEX STAINLESS STEEL FASTENERS
| Temperature | Density (lb/in³) | Electrical Resistivity (µΩ·in) | Thermal Conductivity (BTU/hr·ft·°F) | Heat Capacity (BTU/lbm·°F) | Electrical Resistivity (×10⁻⁶) |
|---|---|---|---|---|---|
| at 68°F | 0.278 | 27.6 | 8.7 | 0.112 | 33.5 |
| at 212°F | — | 26.1 | 9.2 | 0.119 | 35.4 |
| at 392°F | — | 25.4 | 9.8 | 0.127 | 37.4 |
| at 572°F | — | 24.9 | 10.4 | 0.134 | 39.4 |
💡 Practical Difference in Use
Use Duplex Steel S31803/S32205 Fasteners when: high strength, superior corrosion resistance, and reliable performance in chloride-rich or aggressive environments are required for critical industrial applications. → Example: offshore platforms, desalination plants, chemical tanks, marine equipment, and pressure vessels.
Applications of Duplex Steel S31803/S32205 Fasteners
Duplex Steel S31803/S32205 fasteners are known for their excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. These high-performance duplex stainless steel fasteners are ideal for harsh environments involving chlorides, seawater, and chemicals where strength and long service life are essential.
- Chemical Processing: Reactors, storage tanks, and piping systems handling corrosive media.
- Marine & Offshore: Components exposed to seawater and high-salinity environments.
- Oil & Gas: Subsea and topside equipment requiring strength and corrosion resistance.
When to Choose Duplex Steel S31803/S32205 Fasteners?
Duplex Steel S31803/S32205 fasteners are selected for applications requiring a combination of high mechanical strength and excellent corrosion resistance in aggressive environments.
Choose Duplex Steel S31803/S32205 Fasteners when:
- High resistance to pitting and crevice corrosion is required
- Protection against chloride stress corrosion cracking is needed
- High strength-to-weight ratio is important
- Long service life in marine or chemical environments is critical
- Better performance than standard austenitic grades is desired
Industries That Use Duplex Steel S31803/S32205 Fasteners
Duplex Steel S31803/S32205 fasteners are widely used in industries that demand high strength and superior corrosion resistance in aggressive environments.
Ideal for corrosive and high-pressure environments.
Uses
Subsea equipment, pipelines, and offshore rigs.
Why Duplex Steel?
Excellent SCC and chloride resistance with high strength.
Designed for seawater exposure.
Uses
Shipbuilding, seawater systems, and coastal structures.
Why Duplex Steel?
Superior resistance to saltwater corrosion.
Reliable in aggressive chemical environments.
Uses
Chemical tanks, piping, and reactors.
Why Duplex Steel?
Strong resistance to acids and chlorides.
Suitable for high-salinity water systems.
Uses
RO plants, pumps, and brine handling systems.
Why Duplex Steel?
Excellent performance in chloride-rich water.
Reliable in demanding thermal and water systems.
Uses
Heat exchangers and cooling systems.
Why Duplex Steel?
High strength and corrosion resistance.
Effective in chemical-rich processing environments.
Uses
Digesters, bleaching equipment, and piping.
Why Duplex Steel?
Resists corrosive chemicals used in processing.
Usage Guide for Duplex Steel S31803 / S32205 Fasteners
Duplex Steel S31803 / S32205 nuts provide high-strength, corrosion-resistant fastening in aggressive environments.
Choose Duplex Steel S31803 / S32205 Nuts when
- High mechanical strength and load-bearing capacity are required
- Excellent resistance to pitting and crevice corrosion is essential
- Used in offshore, marine, or chemical processing environments
- Long service life in chloride-rich conditions is critical
Duplex Steel bolts offer superior strength and corrosion resistance for demanding industrial applications.
Choose Duplex Steel S31803 / S32205 Bolts when
- High tensile and yield strength are required
- Exposure to seawater, chlorides, or corrosive chemicals is expected
- Used in oil & gas, offshore platforms, or desalination plants
- Reduced weight compared to austenitic stainless steel is beneficial
Duplex Steel screws ensure secure fastening with excellent resistance to stress corrosion cracking.
Choose Duplex Steel S31803 / S32205 Screws when
- Stress corrosion cracking resistance is critical
- Used in marine, chemical, or structural applications
- High strength with good fatigue resistance is needed
- Exposure to fluctuating temperatures and pressures is expected
Duplex Steel washers distribute load effectively while resisting aggressive corrosion.
Choose Duplex Steel S31803 / S32205 Washers when
- High-strength load distribution is required
- Used in chloride-rich or marine environments
- Protection against galvanic corrosion is important
- Long-term joint integrity is critical
Duplex Steel stud bolts are ideal for high-pressure, corrosion-resistant flange connections.
Choose Duplex Steel S31803 / S32205 Stud Bolts when
- Used in offshore oil & gas and petrochemical plants
- Flange joints are exposed to chlorides or seawater
- High strength and resistance to stress corrosion cracking are required
- Reliable sealing under high pressure and temperature is critical
Duplex Steel threaded rods provide versatile, high-strength fastening for harsh environments.
Choose Duplex Steel S31803 / S32205 Threaded Rods when
- High-strength, custom-length fastening is required
- Used in structural, marine, or chemical installations
- Excellent resistance to chloride-induced corrosion is needed
- Long-term durability in extreme environments is essential
Our Industrial Fasteners are manufactured using precision forging and machining processes to ensure excellent dimensional accuracy, strength, and long-term performance. Each fastener undergoes strict quality inspections, including visual and dimensional checks, tensile testing, hardness testing, and thread gauging to verify compliance with specified tolerances.
Comprehensive chemical composition analysis and mechanical property testing are carried out to confirm material integrity and standard conformity. Where required, additional NDT methods such as ultrasonic testing, magnetic particle inspection (MPI), or dye penetrant testing (DPT) are performed to detect surface or internal defects. Controlled forging, heat treatment, and threading processes eliminate issues such as cracks, laps, and thread imperfections.
All fasteners are manufactured and tested in accordance with international standards including ASTM, ASME, ISO, DIN, BS, and IS specifications. Engineered for reliable performance in high-pressure, high-temperature, and corrosive environments, our fasteners are widely used across oil & gas, petrochemical, power generation, construction, and heavy engineering industries.
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