- Chemical Composition:
- Chromium (Cr): 24–26%
- Nickel (Ni): 6–8%
- Molybdenum (Mo): 3–5%
- Nitrogen (N): 0.24–0.32%
- Carbon (C): ≤0.03%
- Balance: Iron (Fe)34.
- Mechanical Properties:
- Tensile Strength: ≥795 MPa (116 ksi)
- Yield Strength: ≥550 MPa (80 ksi)
- Hardness: ≤310 HB
- Elongation: ≥15%23.
- Corrosion Resistance:
- Exceptional resistance to chloride-induced pitting, stress corrosion cracking (SCC), and acidic environments12.
- Superior performance in seawater, sulfuric acid, and organic acids like acetic acid37.
2. Standards & Specifications
Super Duplex 2507 nuts comply with globally recognized standards for quality and safety34:
- ASTM: A240 (plate/sheet), A276 (bar), A193/A194 (fasteners).
- EN: 1.4410 (Europe).
- Other: UNS S32750, NAS 2507 (Japan).
3. Types of Nuts Produced with Super Duplex 2507
This material is ideal for manufacturing heavy-duty nuts for extreme environments, including:
- Hex Nuts (ASTM A194)
- Flange Nuts (ASME B18.2.2)
- Lock Nuts (DIN 985/982)
- Heavy Hex Nuts (ASME B18.2.6)25.
4. Application Fields
Super Duplex 2507 nuts are widely used in industries requiring high strength and corrosion resistance:
- Oil & Gas: Subsea pipelines, offshore platforms, and pressure vessels
- Marine Engineering: Shipbuilding, desalination plants, and seawater cooling systems
- Chemical Processing: Reactors, heat exchangers, and sulfuric acid tanks
- Power Generation: Flue gas desulfurization (FGD) systems and hydraulic pipelines
- Super Duplex 2507 Stainless Steel Nuts, UNS S32750 Nuts, EN 1.4410 Fasteners, SAF 2507 Hex Nuts.
- Long-Tail:
High-Strength 2507 Nuts for Offshore Applications, Corrosion-Resistant Super Duplex Nuts Supplier, 2507 Stainless Steel Flange Nuts ASTM A194. - Regional:
Super Duplex 2507 Nuts USA, EN 1.4410 Nuts Europe, UNS S32750 Nuts Asia.
6. Technical Data Table
| Property | Value | Source |
| Tensile Strength | ≥795 MPa | 23 |
| Yield Strength | ≥550 MPa | 23 |
| Hardness | ≤310 HB | 35 |
| Operating Temperature | -50°C to 300°C | 25 |
| Corrosion Resistance | Excellent (pH 1–12, Cl⁻ rich) | 23 |
Why Choose Super Duplex 2507 Nuts?
Super Duplex 2507 offers 2x higher strength than standard duplex grades (e.g., 2205) and maintains exceptional corrosion resistance in harsh environments like marine and chemical processing23. Its nitrogen-enhanced microstructure ensures longevity and reduced maintenance costs
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