Outokumpu SAF 2507® Duplex Stainless Steel Flange

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: Outokumpu SAF 2507® Duplex Stainless Steel Flange Product Information -:- For detailed product information, please contact sales. -: Outokumpu SAF 2507® Duplex Stainless Steel Flange 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 Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers Outokumpu SAF 2507® Duplex Stainless Steel Flange -:- For detailed product information, please contact sales. -:

Packing of Outokumpu SAF 2507® Duplex Stainless Steel Flange -:- 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 Flange 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