Outokumpu SAF 2507® Duplex Stainless Steel Tube,Pipe

Outokumpu SAF 2507® Duplex Stainless Steel Tube Product Information -:- For detailed product information, please contact sales. -: Outokumpu SAF 2507® Duplex Stainless Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

Outokumpu SAF 2507® Duplex Stainless Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Name: Outokumpu SAF 2507® Super Duplex Stainless Steel (UNS S32750 / EN 1.4410)** ## **Introduction** Outokumpu SAF 2507® is the **premier super duplex stainless steel**, representing the pinnacle of corrosion resistance and mechanical performance in the duplex family. Developed by Sandvik and now produced by Outokumpu, this 25% chromium alloy is engineered for the most extreme environments where standard duplex and austenitic grades are inadequate. SAF 2507® delivers **exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC)** in high-chloride, acidic, and sour (H₂S) services, combined with **very high mechanical strength**. It offers a cost-effective, high-performance alternative to nickel-based alloys for numerous critical applications. ## **Key Features** * **Extreme Corrosion Resistance:** Unmatched resistance to localized corrosion and SCC, validated by a high Pitting Resistance Equivalent Number (PREN > 40), making it suitable for aggressive chloride exposures, seawater, and oxidizing acids. * **Very High Mechanical Strength:** Yield strength (~550 MPa min.) is approximately **triple that of 316L**, enabling lightweight, high-pressure designs and excellent resistance to erosion and abrasion. * **Excellent Sour Service Performance:** Specifically designed and qualified for severe oil & gas sour service (H₂S/CO₂/Cl⁻) environments under NACE MR0175/ISO 15156 standards. * **Superior Structural Stability:** The balanced high-alloy composition ensures a stable austenite-ferrite microstructure, minimizing harmful phase precipitation during fabrication. --- ## **1. Chemical Composition (Typical Weight %)** The composition is precisely controlled to maximize both corrosion resistance and mechanical properties. | Element | Content (%) | Element | Content (%) | | :------------- | :------------ | :------------- | :---------- | | Chromium (Cr) | 24.0 - 26.0 | Nickel (Ni) | 6.0 - 8.0 | | Molybdenum (Mo)| 3.0 - 4.0 | **Nitrogen (N)**| **0.24 - 0.32** | | Manganese (Mn) | ≤ 1.2 | Copper (Cu) | ≤ 0.5 | | Silicon (Si) | ≤ 0.8 | Carbon (C) | ≤ 0.030 | | Phosphorus (P) | ≤ 0.035 | Sulfur (S) | ≤ 0.020 | | **Iron (Fe)** | **Balance** | | | **Key Alloying Note:** The combination of **high Chromium, Molybdenum, and particularly high Nitrogen** is critical to its "super duplex" classification and performance. **PREN Calculation:** PREN = %Cr + 3.3(%Mo) + 16(%N) ≥ **40** (Typically **41-43**) --- ## **2. Physical & Mechanical Properties (Typical - Solution Annealed Condition)** | Property | Value / Range | | :-------------------------------------------- | :-------------------------------- | | Density | 7.8 g/cm³ | | Thermal Conductivity (20°C) | ~17 W/m·K | | Coefficient of Thermal Expansion (20-100°C) | ~12.5 x 10⁻⁶ /K | | Modulus of Elasticity | 200 GPa | | **Tensile Strength (Rm)** | **800 - 1000 MPa** | | **Yield Strength (Rp0.2)** | **≥ 550 MPa** | | **Elongation (A in 50mm)** | **≥ 15 %** | | Hardness (Brinell) | 270 - 320 HBW | | **Impact Toughness (Charpy V-notch, min.)** | **≥ 70 J at -40°C** | | **Critical Pitting Temperature (CPT) - ASTM G48** | **Typically ≥ 70°C** | | Maximum Recommended Service Temperature | ~300°C (with caution above 250°C) | --- ## **3. Product Forms & Applications** **Available Product Forms:** * Plate and Sheet * Seamless and Welded Pipe & Tube * Bar, Wire, and Hollow Bar * Flanges, Fittings, and Forgings **Primary Applications (Extreme Service):** SAF 2507® is specified for the most demanding applications where failure is not an option: * **Oil & Gas – Subsea & Sour Service:** Christmas trees, manifolds, flowlines, risers, umbilicals, downhole tubing, and wellhead components in HPHT and aggressive sour wells. * **Chemical & Petrochemical Processing:** Reactors, columns, and heat exchangers for concentrated sulfuric/phosphoric acids, chloride salts, and aggressive organic chemicals. * **Marine & Offshore:** Seawater piping systems, heat exchangers, pumps, and shafts in naval and offshore platforms. * **Desalination:** High-pressure pumps, energy recovery devices, and RO membranes in seawater reverse osmosis (SWRO) plants. * **Pollution Control:** Scrubbers, ducting, and fans in highly corrosive flue gas desulfurization (FGD) systems. * **Pulp & Paper:** Digester pre-heaters and liquor heaters in kraft pulp mills. --- ## **4. International Standards & Approvals** SAF 2507® is a globally recognized and standardized super duplex grade. | Standard Type | Standard Number & Designation | Notes | | :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- | | **Unified Numbering System (UNS)** | **S32750** | The standard UNS designation for this super duplex alloy. | | **EN / EURONORM (Europe)** | **1.4410** | The common European material number. | | | EN 10088-2: Sheet/Plate
EN 10216-5: Seamless pressure tubes
EN 10253-4: Butt-welding fittings | | | **ASTM (USA)** | **ASTM A240** (Plate/Sheet)
**ASTM A789/A790** (Pipe & Tube)
ASTM A182 (Forgings - F53)
ASTM A276 (Bar) | The primary procurement standards. | | **NACE MR0175 / ISO 15156** | **Fully Compliant** | Approved for severe sour service. Requires strict hardness control (typically ≤ 36 HRC) and proper heat treatment. | | **ASME Boiler & Pressure Vessel Code** | **Section II, Part A** (SA-240, SA-789, etc.) | Approved for pressure-retaining applications. | | **Other Standards** | JIS G4304 / G4305 (Japan)
GB/T 20878 (China) | Included in major national standards. | --- ## **Important Technical & Procurement Note** SAF 2507® is a **high-performance alloy requiring expert handling**. * **Procurement:** Always specify **"Outokumpu SAF 2507® to UNS S32750"** to guarantee receipt of the original, premium grade. Ensure the MTC confirms the high nitrogen content (≥0.24%) and PREN > 40. * **Heat Treatment:** Material must be supplied in the **solution annealed and quenched condition**. The solution annealing temperature is higher than for standard duplex grades. * **Fabrication & Welding:** Welding is a critical operation. It **must** use **over-matching super duplex filler metals** (e.g., ER2594) or nickel-based alloys (e.g., Alloy 625) under strict procedure control (low heat input, controlled interpass temperature). Post-weld heat treatment is generally not recommended. * **Certification:** Require a comprehensive **material test certificate (MTC/CMTR)** including chemical analysis (for PREN), mechanical properties, and often ferrite content (target ~40-50%). For sour service, a separate NACE compliance certificate is typically required. -:- For detailed product information, please contact sales. -: Outokumpu SAF 2507® Duplex Stainless Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7290 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: Outokumpu SAF 2507® Duplex Stainless Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Outokumpu SAF 2507® Duplex Stainless Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Outokumpu SAF 2507® Duplex Stainless Steel Tube -:- For detailed product information, please contact sales. -:

Packing of Outokumpu SAF 2507® Duplex Stainless Steel Tube -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3761 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition