Carlson 2205 (UNS S31803) 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. -: Carlson 2205 (UNS S31803) Duplex Stainless Steel Flange Product Information -:- For detailed product information, please contact sales. -: Carlson 2205 (UNS S31803) Duplex Stainless Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

Carlson 2205 (UNS S31803) Duplex Stainless Steel Product Information -:- For detailed product information, please contact sales. -: **Product Name:** Carlson 2205 Duplex Stainless Steel (UNS S31803) **Introduction:** Carlson 2205 (UNS S31803) is a **workhorse duplex stainless steel** that defines the industry standard for duplex alloys. It combines a microstructure of roughly 50% ferrite and 50% austenite, offering an optimal balance of **high strength, excellent corrosion resistance, and cost-effectiveness**. This grade was developed to resist chloride stress corrosion cracking (SCC) and provide superior pitting and crevice corrosion resistance compared to standard austenitic grades like 316L, while maintaining good fabrication properties. It is the most widely used duplex stainless steel globally. **Key Features:** * **Exceptional Strength-to-Weight Ratio:** Yield strength is approximately **twice that of 316L austenitic stainless steel**, enabling significant weight and cost savings in pressure vessels, structural components, and piping systems. * **Superior Corrosion Resistance:** Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-containing environments like seawater and chemical process streams. * **Good Weldability and Fabricability:** Can be welded and fabricated using standard techniques with proper procedures and duplex-grade consumables. * **Cost-Effective Performance:** Offers a lower lifecycle cost than high-nickel alloys for many demanding applications, bridging the gap between standard stainless steels and more expensive super duplex and nickel alloys. --- **1. Chemical Composition (Typical Weight % - ASTM A240/A789)** The composition is carefully controlled to ensure a stable phase balance after solution annealing. | Element | Content (%) | Element | Content (%) | | :------------- | :---------- | :------------- | :---------- | | Chromium (Cr) | 21.0 - 23.0 | Nickel (Ni) | 4.5 - 6.5 | | Molybdenum (Mo)| 2.5 - 3.5 | Nitrogen (N) | 0.08 - 0.20 | | Manganese (Mn) | ≤ 2.00 | Copper (Cu) | ≤ 0.75* | | Silicon (Si) | ≤ 1.00 | Carbon (C) | ≤ 0.030 | | Phosphorus (P) | ≤ 0.030 | Sulfur (S) | ≤ 0.020 | | **Iron (Fe)** | **Balance** | | | *Note: UNS S32205, a closely related grade, has a narrower composition range with a minimum Mo content of 3.0% and a higher minimum N content (0.14-0.20%) for enhanced pitting resistance. S31803 is the more common and accepted standard grade.* --- **2. Physical & Mechanical Properties (Typical at Room Temperature)** | Property | Value / Range | | :-------------------------------------------- | :-------------------------------- | | Density | ≈ 7.80 g/cm³ | | Melting Range | ≈ 1380 - 1445 °C | | Specific Heat Capacity (0-100°C) | ≈ 500 J/kg·K | | Thermal Conductivity (20°C) | ≈ 19 W/m·K | | Coefficient of Thermal Expansion (20-100°C) | ≈ 13.7 x 10⁻⁶ /K | | Modulus of Elasticity (Tensile) | ≈ 200 GPa | | **Tensile Strength (Rm)** | **≥ 620 MPa** (ASTM A240) | | **Yield Strength (Rp0.2)** | **≥ 450 MPa** (ASTM A240) | | **Elongation (A in 50mm)** | **≥ 25 %** | | Hardness (Brinell) | ≤ 293 HBW | | Impact Toughness (Charpy V-notch) | Typically > 100 J at -40°C | | **PREN (Pitting Resistance Equivalent Number)** | **PREN = %Cr + 3.3(%Mo) + 16(%N) ≈ 33-36** | *The PREN value quantifies its excellent localized corrosion resistance.* --- **3. Product Forms & Applications** **Available Product Forms:** * Plate, Sheet, and Strip * Seamless and Welded Pipe & Tubing (Process, Mechanical, Heat Exchanger) * Bar, Rod, Wire, and Forgings * Flanges, Fittings, and Fasteners **Primary Applications:** * **Oil & Gas Industry:** Production and process piping, separators, heat exchangers, flowlines, and pressure vessels, especially in offshore and sour (H₂S) service applications (when compliant with NACE MR0175). * **Chemical & Petrochemical Processing:** Tanks, reactors, columns, and piping for handling chlorides, organic acids, and acidic brines. * **Pulp & Paper Industry:** Digester pre-heaters, bleach washer drums, and liquor handling systems. * **Marine & Offshore:** Seawater cooling systems, piping, pumps, and valves on ships and offshore platforms. * **Water & Wastewater Treatment:** High-pressure RO membranes, piping, and components in desalination plants. * **Chemical Tankers:** Cargo tanks and piping systems. * **Architecture & Construction (Heavy Duty):** Bridges, pressure vessels, and structural components in aggressive coastal environments. --- **4. International Standards & Approvals** UNS S31803 is universally recognized and specified across major international standards. The closely related S32205 is often specified interchangeably or for slightly higher guaranteed properties. | Standard Type | Standard Number & Designation | Notes | | :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- | | **Unified Numbering System (UNS)** | **S31803** (Also **S32205**) | S32205 has tighter composition (higher Mo, N min.) for better pitting resistance. | | **ASTM (USA)** | ASTM A240 (Plate/Sheet/Strip)
ASTM A790/A789 (Pipe & Tube)
ASTM A182 (Forgings & Fittings)
ASTM A276 (Bar) | The primary reference standards for procurement in North America and globally. | | **EN / EURONORM (Europe)** | **1.4462** (Common European material number for both S31803/S32205) | Widely used across European industries. | | | EN 10088-2: Sheet/Plate
EN 10216-5: Seamless pressure tubes
EN 10253-4: Butt-welding fittings | | | **NACE MR0175/ISO 15156** | **Compliant** | Approved for use in sour service (H₂S) oilfield environments within defined hardness and environmental limits. | | **Other Standards** | JIS G4304 / G4305 (Japan) - SUS 329J3L
GB/T 20878 (China) - 022Cr22Ni5Mo3N
AS 4677 (Australia) - 2205 | Local designations may vary slightly. | **Important Note:** While UNS S31803 and S32205 are often considered commercial equivalents, critical applications may specify S32205 for its guaranteed higher minimum alloy content. Always refer to the specific purchase order, material standard (e.g., ASTM A240), and the certified material test report (CMTR/MTR) for guaranteed properties. Proper fabrication, welding (using 2209-type consumables), and heat treatment are essential to preserve the microstructure and corrosion resistance. -:- For detailed product information, please contact sales. -: Carlson 2205 (UNS S31803) Duplex Stainless Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7271 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. -: Carlson 2205 (UNS S31803) Duplex Stainless Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Carlson 2205 (UNS S31803) Duplex Stainless Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers Carlson 2205 (UNS S31803) Duplex Stainless Steel Flange -:- For detailed product information, please contact sales. -:

Packing of Carlson 2205 (UNS S31803) 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 3742 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