Table of Contents
- Super Duplex S32750 Nuts Overview
- Super Duplex Fasteners Specifications
- What are Super Duplex UNS S32750 Nuts?
- Super Duplex Fasteners Technical Properties & Composition
- Why Industries Prefer Super Duplex Steel F53 Nuts
- Types of Super Duplex Steel Nuts
- Key Advantages of UNS S32750 Nuts
- Key Applications of Super Duplex S32750 Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Super Duplex S32750 / F53 Nuts Suppliers & Exporters
Aurum Overseas is a market-leading Super Duplex S32750 Nuts Supplier and specialized Super Duplex S32750 Nuts Exporter, providing high-integrity, 25% chromium ferritic-austenitic fasteners designed for hyper-aggressive marine, subsea, and aggressive chemical processing environments.
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Manufactured in strict compliance with ASTM A182 and ASTM A240 standards, Super Duplex Steel 2507 Nuts deliver a guaranteed Pitting Resistance Equivalent Number (PREN) ≥ 42. This extreme corrosion defense allows these high-load threaded fasteners to replace nickel alloys in severe sour gas, high-salinity desalination, and acidic chloride systems while drastically reducing structural weight.
As a globally recognized Super Duplex S32750 Nuts Exporter, Aurum Overseas supplies fully certified, origin-traceable bolting hardware across North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy, Netherlands, Norway), the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman), and Asia-Pacific (Singapore, Malaysia, Australia).
Super Duplex Fasteners Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grade | Super Duplex S32750 / ASTM A182 F53 / SAF 2507 |
| UNS Number | UNS S32750 |
| Manufacturing Standards | ASTM A182, ASTM A240, ASME SA182, DIN 934, ISO 4032, ANSI B18.2.2 |
| Size Range | M3 to M100 | 3/16" to 4" | Custom Dimensions |
| Thread Configuration | ASME B1.1 2A/3A - 2B/3B Unified (UNC, UNF, 8UN) & B1.13M Metric |
| Nut Formats | Hex Head, Heavy Hex, Square, Lock, Slotted, Coupling, Flange Nuts |
| Testing Standards | ASTM E8, SAE J411, EN 14399, ASME B1.2, ISO 7090, DIN 125 |
What are Super Duplex UNS S32750 Nuts?
UNS S32750 Nuts are high-alloy super duplex stainless steel fasteners engineered with a 50/50 phase balance of austenite and ferrite to deliver extreme mechanical strength and resistance to active chloride corrosion media.
Featuring 25% chromium, 4% molybdenum, and 0.27% nitrogen, Super Duplex Steel F53 Nuts offer exceptional yield strength exceeding 550 MPa alongside high impact toughness down to -40°C. This combination prevents crevice corrosion, intergranular attack, and stress corrosion cracking in high-pressure oilfield manifolds and deepwater subsea applications.
Super Duplex Fasteners Technical Properties & Composition
Chemical Composition of Super Duplex Steel S32750 Nuts (%)
| Element | UNS S32750 (Grade F53 / 2507) Content (%) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.20 max |
| Silicon (Si) | 0.80 max |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.020 max |
| Chromium (Cr) | 24.0 – 26.0 |
| Molybdenum (Mo) | 3.0 – 5.0 |
| Nickel (Ni) | 6.00 – 8.00 |
| Nitrogen (N) | 0.24 – 0.32 |
| Copper (Cu) | 0.50 max |
| Iron (Fe) | Balance (~60%) |
Physical & Thermal Properties of Super Duplex Steel S32750
| Property / Parameter | Technical Value |
|---|---|
| Density (g/cm³ / lb/in³) | 7.805 / 0.285 |
| Melting Point (°C / °F) | 1420 – 1465 / 2588 – 2669 |
| Yield Strength (0.2% Offset, MPa) | ≥ 550 |
| Tensile Strength (MPa) | ≥ 750 |
| Elongation (% in 50mm) | ≥ 25 |
| Hardness (Rockwell C) | ≤ 32 HRC |
Equivalent Grade Standards
| Standard Body | Designation |
|---|---|
| UNS | UNS S32750 |
| ASTM / ASME | ASTM A182 F53 / ASME SA182 F53 |
| EN / DIN / Werkstoff Nr. | 1.4410 / X2CrNiMoN25-7-4 |
| Trade Name | SAF 2507 / Super Duplex 2507 |
Why Industries Prefer Super Duplex Steel F53 Nuts
Offshore marine operators and chemical plant managers specify Super Duplex Steel F53 Nuts because their high mechanical strength permits compact, thin-walled flange designs without sacrificing pressure containment ratings.
As a dedicated Super Duplex S32750 Nuts Supplier, Aurum Overseas manufactures nuts that withstand localized crevice corrosion under submerged marine deposits and high-velocity sea water. The addition of 0.24-0.32% nitrogen stabilizes the austenitic structure, guaranteeing high impact resistance and resistance to pitting under aggressive sour oilfield operations.
Types of Super Duplex Steel Nuts
Aurum Overseas supplies a comprehensive range of super duplex stainless steel nut configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
UNS S32750 Hex Head Nuts
UNS S32750 Square Nuts
UNS S32750 Lock Nuts
UNS S32750 Eye Nuts
UNS S32750 Wing Nuts
UNS S32750 T Nuts
UNS S32750 Panel Nuts
UNS S32750 Coupling Nuts
UNS S32750 Dome Nuts
Key Advantages of UNS S32750 Nuts
PREN Rating ≥ 42
Provides outstanding defense against critical pitting and crevice corrosion in hot seawater.
Superior Mechanical Yield (≥ 550 MPa)
Yield strength is significantly higher than standard 316L and lean duplex alloys.
Chloride SCC Resistance
Ferritic-austenitic matrix resists stress corrosion cracking in high-chlorine and sour gas environments.
Low Thermal Expansion
Thermal expansion rate closely matches carbon steel, protecting gasket seals during heat cycles.
Erosion-Corrosion Defense
High matrix hardness (≤ 32 HRC) resists abrasive wear in high-velocity fluid streams.
Key Applications of Super Duplex S32750 Nuts
| Industry Sector | Primary Fastener Application | Key Service Environment |
|---|---|---|
| Subsea & Offshore Extraction | Subsea manifolds, riser clamps, umbilical terminations | High-pressure sour oil, marine splash zones, and seabed deepwater |
| Desalination Plants | SWRO high-pressure pump casings, energy recovery devices | Concentrated brine and hot chlorinated seawater |
| Flue Gas Desulfurization (FGD) | Scrubber tower internals, ducting flange bolting | Highly acidic corrosive slurries containing sulfurous acids |
| Chemical Processing | Nitric acid coolers, organic acid reactors, heat exchangers | Highly oxidizing chemical reagents and concentrated acids |
Quality Testing & Inspection
Aurum Overseas implements rigorous quality control procedures for all orders managed by our team as a dedicated Super Duplex S32750 Nuts Supplier and Super Duplex S32750 Nuts Exporter.
- Chemical & Alloy Verification: XRF spectrometry and Positive Material Identification (PMI) to confirm precise alloy balance.
- Mechanical Strength Testing: Tensile, proof load, and hardness testing performed per ASTM E8, SAE J411, and EN 14399 standards.
- Sour Service Resistance: Inspection to verify sulfide stress cracking resistance per NACE MR0175 / ISO 15156 requirements.
- Dimensional Accuracy: Thread pitch and flatness gauging per ASME B1.2, DIN 125, DIN 9021, ISO 7090, and JIS B 1256 standards.
- Traceable Documentation: Detailed chemical heat analysis and material test reports provided per EN 10204 3.1 specifications.
Global Export Markets
As a global Super Duplex S32750 Nuts Exporter, Aurum Overseas supplies fully certified fasteners to major energy, chemical, and industrial heat-treating hubs worldwide.
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
Super Duplex Steel 2507 Nuts feature a guaranteed Pitting Resistance Equivalent Number (PREN) ≥ 42, making them suitable for aggressive chloride and hot seawater environments.
Yes, Super Duplex Steel F53 Nuts adhere strictly to the ASTM A182 Grade F53 forging specification, which shares the identical chemistry and structural mechanical properties of UNS S32750 (SAF 2507).
Yes, Aurum Overseas regularly exports certified UNS S32750 Nuts across North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy, Netherlands, Norway), the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman), and Asia-Pacific (Singapore, Malaysia, Australia).
Super Duplex S32750 Nuts contain higher levels of chromium (25% vs 22%), molybdenum (4% vs 3%), and nitrogen, providing significantly higher yield strength (550 MPa vs 450 MPa) and superior pitting resistance (PREN ≥ 42 ≥ vs ≥ 35).
Yes, as an established Super Duplex S32750 Nuts Exporter, every order includes fully traceable EN 10204 3.1 Material Test Reports detailing chemical heat numbers, mechanical proof loads, and PREN calculations.
Contact Aurum Overseas
Aurum Overseas provides high-performance Super Duplex S32750 Nuts manufactured to strict international quality standards with rapid global dispatch.
Contact our sales engineering team today for technical support and prompt commercial quotes.