High Quality Super Duplex Steel S32750/S32760 Fasteners
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Ratnadeep Steel & Engg. Co. is a leading manufacturer, exporter, and supplier of premium-quality Super Duplex Steel S32750/S32760 Fasteners. Manufactured from high-alloy super duplex stainless steel using advanced production processes, our fasteners offer exceptional strength, outstanding corrosion resistance, and long-term reliability for the most demanding industrial applications.
Super Duplex Steel S32750 and S32760 fasteners are highly regarded for their superior resistance to pitting, crevice corrosion, stress corrosion cracking, and chloride-induced corrosion, even in extreme environments. With a higher chromium, molybdenum, and nitrogen content, these grades provide significantly enhanced corrosion resistance and mechanical strength compared to standard duplex and austenitic stainless steels, making them ideal for high-pressure and highly aggressive service conditions.
Featuring precise threading, excellent surface finish, and strict dimensional tolerances, our Super Duplex Steel S32750/S32760 fasteners ensure reliable performance under severe loads, vibration, and continuous exposure to corrosive media. They are extensively used in offshore oil & gas platforms, subsea equipment, chemical processing plants, marine engineering, desalination facilities, heat exchangers, and power generation industries.
Our Range of Super Duplex Steel UNS S32750 / 2507 Industrial Fasteners
- Super Duplex Steel S32750 / S32760 Hex & Heavy Hex Nuts
- Lock Nuts, Nylon Insert Nuts & Coupling Nuts
- DIN 1.4410 Precision Machined Super Duplex Nuts
- Exceptional resistance to pitting, crevice & SCC corrosion
- ASTM A182 Super Duplex Steel S32750 / S32760 Bolts
- Hex, Heavy Hex, Machine & Structural Bolts
- DIN 1.4410 High-Strength Super Duplex Bolting
- Ideal for offshore platforms and subsea applications
- ASTM A182 Super Duplex Steel Cap & Set Screws
- Socket Head, Button Head & Hex Head Screws
- UNS S32750 / S32760 High PREN Fastener Grades
- Superior torque strength in aggressive environments
- Super Duplex Steel S32750 / S32760 Plain & Spring Washers
- Split, Ogee & Dock Washers as per DIN standards
- Enhanced load distribution for high-pressure joints
- Used in marine, offshore & desalination plants
- ASTM A182 Super Duplex Steel Stud Bolts
- Single Ended, Double Ended & Fully Threaded Studs
- UNS S32750 / S32760 for extreme pressure services
- Widely used in subsea flanges and valve assemblies
- ASTM A182 Super Duplex Steel Threaded Rods
- Fully Threaded and Cut-to-Length Stud Rods
- DIN 1.4410 Super Duplex Steel Tie Rods
- Outstanding strength-to-weight ratio and durability
S32750 / S32760 SUPER DUPLEX STEEL ASTM A182 FASTENERS EQUIVALENT GRADES
| Standard | UNS | WNR. |
|---|---|---|
| Super Duplex Steel 2507 | S32750 / S32760 | 1.4410 |
SPECIFICATION OF SUPER 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 SUPER DUPLEX STEEL S32750 / S32760 FASTENERS
| C | Cr | Ni | Mo | N | Others |
|---|---|---|---|---|---|
| 0.020 | 25.0 | 7.0 | 4.0 | 0.27 | S ≤ 0.001 |
MECHANICAL PROPERTIES OF ASME SA182 SUPER DUPLEX STEEL BOLTS & NUTS
| Ultimate Tensile Strength (ksi) | 116 min |
|---|---|
| 0.2% Offset Yield Strength (ksi) | 80 min |
| 0.1% Offset Yield Strength (ksi) | 91 min |
| Elongation in 2 inches (%) | 15 min |
| Hardness (Rockwell C) | 32 max |
| Impact Energy (ft-lbs) | 74 min |
PHYSICAL PROPERTIES OF UNS S32750 / S32760 SUPER DUPLEX FASTENERS
| Density | 0.28 lb/in³ |
|---|---|
| Modulus of Elasticity | 29 × 10⁶ psi |
| Coefficient of Thermal Expansion (68–212°F) | 7.2 × 10⁻⁶ /°F |
| Thermal Conductivity | 8.7 Btu/hr·ft·°F |
| Heat Capacity | 0.12 Btu/lb·°F |
| Electrical Resistivity | 31.5 Ω·in × 10⁻⁶ |
💡 Practical Difference in Use
Use Super Duplex Steel S32750/S32760 Fasteners when: extremely high strength, exceptional resistance to pitting, crevice corrosion, and chloride stress corrosion cracking are required for the most aggressive service conditions. → Example: offshore oil & gas platforms, subsea systems, desalination plants, chemical processing units, heat exchangers, and high-pressure vessels.
Applications of Super Duplex Steel S32750/S32760 Fasteners
Super Duplex Steel S32750/S32760 fasteners are engineered for extreme environments where standard duplex or austenitic stainless steels may fail. With a very high PREN value and superior mechanical strength, these super duplex stainless steel fasteners deliver outstanding performance in chloride-rich, seawater, and highly corrosive chemical environments requiring long service life and safety-critical reliability.
- Chemical Processing: Reactors, heat exchangers, piping systems, and vessels handling aggressive chemicals.
- Marine & Offshore: Subsea equipment, offshore structures, and seawater handling systems.
- Oil & Gas: High-pressure subsea and topside equipment exposed to corrosive fluids.
When to Choose Super Duplex Steel S32750/S32760 Fasteners?
Super Duplex Steel S32750/S32760 fasteners are selected for critical applications demanding the highest levels of corrosion resistance, mechanical strength, and resistance to stress corrosion cracking in extreme environments.
Choose Super Duplex Steel S32750/S32760 Fasteners when:
- Maximum resistance to pitting and crevice corrosion is required
- Superior protection against chloride stress corrosion cracking is critical
- Very high strength-to-weight ratio is needed for structural integrity
- Long-term performance in offshore or subsea environments is essential
- Performance beyond standard duplex and austenitic stainless steels is required
Industries That Use Super Duplex Steel S32750/S32760 Fasteners
Super Duplex Steel S32750/S32760 fasteners are widely used in industries where extreme corrosion resistance, high pressure tolerance, and long service life are mandatory.
Designed for the most aggressive and high-pressure environments.
Uses
Subsea systems, wellhead equipment, pipelines, and offshore platforms.
Why Super Duplex Steel?
Exceptional strength and superior resistance to chloride-induced corrosion.
Optimized for continuous seawater exposure.
Uses
Shipbuilding, offshore structures, seawater piping, and coastal installations.
Why Super Duplex Steel?
Outstanding resistance to seawater corrosion and biofouling.
Reliable in highly corrosive chemical environments.
Uses
Chemical reactors, pressure vessels, heat exchangers, and piping.
Why Super Duplex Steel?
Excellent resistance to acids, chlorides, and aggressive media.
Ideal for extreme salinity and chloride exposure.
Uses
RO systems, high-pressure pumps, brine handling units.
Why Super Duplex Steel?
High PREN value ensures long service life in saline conditions.
Engineered for demanding thermal and fluid systems.
Uses
Heat exchangers, condensers, cooling water systems.
Why Super Duplex Steel?
High strength combined with excellent corrosion resistance.
Performs reliably in chemical-intensive processes.
Uses
Digesters, bleaching plants, and chemical recovery systems.
Why Super Duplex Steel?
Resists aggressive chemicals and high operating temperatures.
Usage Guide for Super Duplex Steel S32750 / S32760 Fasteners
Super Duplex Steel S32750 / S32760 nuts provide extremely high strength and outstanding corrosion resistance in the most aggressive service environments.
Choose Super Duplex Steel S32750 / S32760 Nuts when
- Maximum mechanical strength and load-bearing capacity are required
- Superior resistance to pitting, crevice corrosion, and chlorides is essential
- Used in offshore, subsea, marine, or chemical processing environments
- Long service life in severe chloride-rich conditions is critical
Super Duplex Steel bolts deliver exceptional strength, pressure resistance, and corrosion protection for extreme industrial applications.
Choose Super Duplex Steel S32750 / S32760 Bolts when
- Very high tensile and yield strength are required
- Continuous exposure to seawater, chlorides, or aggressive chemicals is expected
- Used in offshore oil & gas platforms, subsea systems, or desalination plants
- Higher performance than duplex or austenitic stainless steels is required
Super Duplex Steel screws ensure secure fastening with superior resistance to stress corrosion cracking and fatigue.
Choose Super Duplex Steel S32750 / S32760 Screws when
- Exceptional resistance to chloride stress corrosion cracking is critical
- Used in marine, offshore, chemical, or structural applications
- Very high strength with excellent fatigue resistance is needed
- Exposure to extreme pressures and temperature variations is expected
Super Duplex Steel washers ensure optimal load distribution while resisting aggressive chemical and chloride attack.
Choose Super Duplex Steel S32750 / S32760 Washers when
- High-strength load distribution is essential for joint integrity
- Used in extreme chloride-rich or marine environments
- Superior resistance to galvanic and crevice corrosion is required
- Long-term performance in safety-critical assemblies is critical
Super Duplex Steel stud bolts are ideal for high-pressure flange connections in highly corrosive environments.
Choose Super Duplex Steel S32750 / S32760 Stud Bolts when
- Used in offshore oil & gas, subsea, and petrochemical facilities
- Flange joints are exposed to seawater, chlorides, or sour service
- Exceptional strength and resistance to stress corrosion cracking are required
- Reliable sealing under extreme pressure and temperature is essential
Super Duplex Steel threaded rods provide ultra-high-strength fastening for the most demanding environments.
Choose Super Duplex Steel S32750 / S32760 Threaded Rods when
- Very high-strength, custom-length fastening is required
- Used in offshore, marine, chemical, or structural installations
- Outstanding resistance to chloride-induced corrosion is essential
- Long-term durability in extreme and safety-critical environments is required
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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