Super Duplex Steel Alloy 2507 & F53 Fasteners Overview
Super Duplex Steel Alloy 2507 & F53 Fasteners secure bolted connections in the most demanding chloride and sour-service piping and equipment used offshore and subsea. Its 25% chromium, 7% nickel, 4% molybdenum composition with controlled nitrogen gives a PREN of 40–43, making it a preferred upgrade from Alloy 2205 wherever standard duplex bolting risks galling or localized attack.
Quick Specifications of Super Duplex Steel Alloy 2507 & F53 Fasteners
Super Duplex Steel Alloy 2507 & F53 Fasteners are produced to internationally recognized bolting specifications.
| Field | Detail |
|---|---|
| Material/Grade | Super Duplex Steel Alloy 2507 & F53 |
| UNS | S32750 |
| Werkstoff Number | 1.4410 |
| Standards | ASTM A276, ASTM A479 |
| Form | Bolts, Nuts, Studs |
| Finish | Passivated |
| Heat Treatment | Solution Annealed, water quenched |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 2507 & F53
Alloy 2507/F53 is recognized under several international designations below.
| UNS | Werkstoff Number | EN Steel Name | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|---|
| S32750 | 1.4410 | X2CrNiMoN25-7-4 | Alloy 2507 / Super Duplex 2507 | ASTM A276/A479 |
Chemical Composition of Alloy 2507 & F53
Composition per ASTM A276/A479 for UNS S32750; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 |
| Nitrogen (N) | 0.24 – 0.32 |
| Carbon (C), max | 0.030 |
| Manganese (Mn), max | 1.20 |
| Silicon (Si), max | 0.80 |
| Phosphorus (P), max | 0.035 |
| Sulphur (S), max | 0.020 |
| Copper (Cu), max | 0.50 |
| Iron (Fe) | Balance |
Physical Properties of Super Duplex Steel Alloy 2507
Typical physical properties for the 2507 super duplex family are listed below; confirm exact heat-specific figures against the mill test certificate.
| Property | Value |
|---|---|
| Density | ~7.80 g/cm3 (typical; confirm on request) |
| Melting Range | Confirm against applicable datasheet |
| Magnetic Behaviour | Magnetic (ferrite phase present) |
Mechanical Properties of Super Duplex Steel Alloy 2507 & F53 Fasteners
Minimum mechanical properties per ASTM A276/A479 for UNS S32750.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 795 MPa |
| Yield Strength (0.2% offset) | 550 MPa |
| Elongation | 15% |
| Hardness | 310 HB max / 32 HRC max |
| Condition | Solution Annealed |
Corrosion Resistance of Super Duplex Steel Alloy 2507
- With a PREN of 40–43, Super Duplex Steel Alloy 2507 & F53 Fasteners significantly outperform standard duplex 2205 and austenitic 316L in aggressive media.
- Pitting resistance: excellent resistance to chloride-induced pitting, with a critical pitting temperature above 50°C.
- Crevice resistance: strong performance under bolt heads, nuts and flange faces.
- Chloride SCC resistance: very high resistance to chloride stress corrosion cracking in hot, saline environments.
Heat Resistance of Super Duplex Steel Alloy 2507
Alloy 2507 & F53 fasteners are rated for continuous service up to roughly 316°C (600°F); extended exposure above this can reduce toughness and corrosion resistance. Minimum design temperature without impact testing is typically -29°C (-20°F). Confirm exact limits against the applicable design code and application before specifying.
Key Properties of Super Duplex Steel Alloy 2507 & F53 Fasteners
Beyond corrosion and heat performance, Alloy 2507 fasteners offer these additional properties.
- Very high mechanical strength, roughly 45% above standard 2205
- Good weldability using 2507/P100 matching filler metal
- Resists carbide-related intergranular corrosion
- Good toughness maintained into cold service temperatures
Benefits of Super Duplex Steel Alloy 2507 & F53 Fasteners
Choosing Alloy 2507 & F53 fasteners from Zeon Exports delivers measurable advantages for your project.
- Longest service life among duplex grades in the harshest chloride media
- Full MTC 3.1 documentation for project QA/QC requirements
- Multiple sizes, threads and finishes to match exact project specs
- Reliable bulk supply with consistent ready stock
- Competitive export pricing for large industrial orders
- Fast dispatch to global project sites and ports
Related Products
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Request a Quote for Super Duplex Steel Alloy 2507 & F53 Fasteners
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Call: +91 98205 33105
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Frequently Asked Questions About Super Duplex Steel Alloy 2507 & F53 Fasteners
Common questions about Super Duplex Steel Alloy 2507 & F53 Fasteners, answered below.
Q1: What is Super Duplex Steel Alloy 2507 & F53?
Ans. Alloy 2507/F53 (UNS S32750) is a super duplex stainless steel with 25% Cr, 7% Ni and 4% Mo, giving a PREN of 40–43.
Q2: Which fastener types are available in Alloy 2507?
Ans. We supply bolts, nuts and studs to ASTM A276/A479 across standard thread sizes and lengths.
Q3: What standards do Alloy 2507 fasteners meet?
Ans. Fasteners are manufactured to ASTM A276/A479, certified to EN 10204 3.1 mill test certificates.
Q4: How does 2507 compare to Alloy 2205?
Ans. 2507 has higher chromium, nickel and molybdenum than 2205, giving a PREN of 40–43 versus 34–38 and notably higher strength.
Q5: What is the maximum service temperature?
Ans. Continuous service is generally limited to roughly 316°C (600°F); confirm exact limits against your design code.
Q6: Is Alloy 2507 magnetic?
Ans. Yes, like other duplex grades, Alloy 2507 is magnetic due to its ferrite phase content.
Q7: What certification is provided with orders?
Ans. Every order ships with EN 10204 3.1 mill test certificates confirming grade, heat and dimensions.
Q8: Does Zeon Exports supply custom sizes?
Ans. Yes, fasteners are available in custom thread sizes and lengths on request for bulk industrial orders.
