Introduction SAF 2507 Super Duplex F53
SAF 2507, also known as F53, is a super duplex stainless steel that belongs to the SAF (Sandvik and Fagersta) family of alloys. UNS S32750 is the material grade designation for this specific super duplex stainless steel. Let's break down the key characteristics of SAF 2507 (F53):
HT PIPE is a leading stockist and global exporter with over 16 years of expertise in international trade. We supply pipes, plates, round bars, and a comprehensive range of pipe fittings, flanges, and valves. Contact us now for free quotes and personalized product information.
1. F53 Duplex Chemical Composition
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 |
| Manganese (Mn) | 1.20 max |
| Silicon (Si) | 0.80 max |
| Nitrogen (N) | 0.24 – 0.32 |
| Carbon (C) | 0.030 max |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.020 max |
| Iron (Fe) | Balance |
Mechanical Properties of SAF 2507 Sheet, Plate & Pipe
| Property | Minimum Typical Value | Unit |
|---|---|---|
| Tensile strength | 800 | MPa |
| Yield strength (0.2% offset) | 550 | MPa |
| Elongation at break | 15 | % |
| Hardness, Brinell (HB) | 270 | HB |
| Hardness, Rockwell C | 28 | HRC |
| Impact toughness (Charpy V-notch, -46°C) | 45 | J |
Physical Properties of F53 / UNS S32750
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.80 g/cm³ | 0.282 lb/in³ |
| Melting point | 1400 – 1455 °C | 2550 – 2650 °F |
| Thermal expansion (20–100°C) | 13.0 × 10⁻⁶ /°C | 7.2 × 10⁻⁶ /°F |
| Thermal conductivity (20°C) | 14 W/m·K | 97 BTU·in/ft²·h·°F |
| Specific heat (20°C) | 480 J/kg·K | 0.115 BTU/lb·°F |
| Elastic modulus | 185 GPa | 26.8 × 10⁶ psi |
2. Super Duplex F53 Corrosion Resistance:
- One of the primary advantages of SAF 2507 (F53) is its outstanding corrosion resistance. AISI 2507 super duplex is highly resistant to general corrosion, pitting corrosion, and crevice corrosion, making it suitable for use in aggressive environments, especially those containing chloride ions.
3. DIN 1.4410 Dual-Phase Microstructure:
- Super duplex stainless steels like SAF 2507 have a dual-phase microstructure consisting of both austenitic and ferritic phases. This dual-phase structure contributes to the material's high strength and toughness.
4. Saf 2507 Material High Strength:
- SAF 2507 super duplex exhibits high tensile and yield strength, making it suitable for applications where strength and corrosion resistance are critical factors.
5. Industries and Applications of SAF 2507 / F53
Oil & Gas: Subsea pipelines, risers, manifolds, wellhead components, and process piping in sour service.
Chemical Processing: Reactors, heat exchangers, pressure vessels, and storage tanks handling chlorides and acids.
Desalination: Reverse osmosis pressure vessels, pumps, and piping exposed to seawater.
Marine Engineering: Propeller shafts, seawater cooling systems, offshore platforms, and shipbuilding components.
Pulp & Paper: Digesters, bleach washers, and liquor tanks.
Power Generation: Condensers, feedwater heaters, and flue gas desulfurization (FGD) systems.
Structural & Architectural: Load-bearing components in corrosive environments where high strength is required.
6. Saf 2507 Stainless Steel Weldability:
- While super duplex stainless steels can be more challenging to weld compared to austenitic stainless steels, SAF 2507 is known for its good weldability. Proper welding procedures and practices should be followed to maintain the corrosion resistance and mechanical properties of the material.
7. ASTM UNS S32750 Standards:
| Product Form | Common Standards |
|---|---|
| Sheet / Plate | ASTM A240 / ASME SA-240 |
| Bar / Forgings | ASTM A479 / ASTM A182 (F53) |
| Seamless & Welded Pipe | ASTM A790 / ASME SA-790 |
| Seamless & Welded Tube | ASTM A789 / ASME SA-789 |
| Pipe Fittings | ASTM A815 / ASME SA-815 |
| Flanges | ASTM A182 F53 / ASME SA-182 |
| Fasteners | ASTM A193 / A194 / A320 (custom grades) |
8. Heat Resistance:
- SAF 2507 super duplex retains its mechanical properties and corrosion resistance at elevated temperatures, making it suitable for applications involving high-temperature and high-pressure conditions.
Quality Standards, Testing & Export Documentation
Huitong supplies SAF 2507 / UNS S32750 material with the following documentation and quality assurance:
- Compliance with ASTM A240, A790, A789, A182, A815, and ASME SA equivalents
- Mill Test Certificate (MTC) with heat number, chemical analysis, and mechanical test results
- Positive Material Identification (PMI) testing on request
- Third-party inspection by SGS, BV, TÜV, or Lloyd's upon request
- Non-destructive testing: ultrasonic testing (UT), dye penetrant testing (PT), radiographic testing (RT)
- Export packaging: plywood cases, pallets, seaworthy wrapping, and container loading photos
- Experience supplying oil & gas, desalination, and EU PED certified projects
Frequently Asked Questions (FAQ)
Q1: What does SAF 2507 stand for?
A: SAF 2507 is a super duplex stainless steel grade originally developed by Sandvik and Fagersta. Its unified numbering system designation is UNS S32750, and it is also known as F53 in forgings or 1.4410 in European standards.
Q2: What is the difference between SAF 2507 and duplex 2205?
A: SAF 2507 (UNS S32750) has higher chromium, molybdenum, and nitrogen content than duplex 2205 (UNS S32205), giving it a higher PREN (>40 vs ~34–36) and better corrosion resistance in chloride-rich and sour environments. It also has higher strength.
Q3: Can SAF 2507 be welded?
A: Yes, but it requires controlled heat input and matching filler metals such as ER2594 (wire) or E2594 (electrode). Proper welding procedure is essential to maintain the austenite-ferrite balance and corrosion resistance.
Q4: What is the price of SAF 2507 / UNS S32750 material?
A: Pricing depends on product form, size, quantity, standard, and delivery destination. Contact Huitong with your specification for a competitive quote, typically returned within 24 hours.
Q5: Do you supply MTC and third-party inspection for SAF 2507?
A: Yes. Every order can be supplied with a Mill Test Certificate, and third-party inspection by SGS, BV, TÜV, or Lloyd's can be arranged on request.
Q6: Which countries do you export SAF 2507 material to?
A: We regularly export to the Middle East (Saudi Arabia, Qatar, UAE), Europe, Southeast Asia, and the Americas, with full export documentation and certificates of origin.
Our company is a professional and reliable supplier of 2507 materials. Not only provide S32750 super duplex stainless steel tube, we can provide free samples of 2507 pipes, sheets, plates, pipe fittings, flanges, round bars, and fasteners. Welcome to contact us.
