Outokumpu 904L High Performance Austenitic 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 904L High Performance Austenitic Stainless Steel Flange Product Information -:- For detailed product information, please contact sales. -: Outokumpu 904L High Performance Austenitic Stainless Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

Outokumpu 904L High Performance Austenitic Stainless Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Name:** Outokumpu 904L (UNS N08904 / 1.4539) High-Performance Austenitic Stainless Steel **Classification:** Super Austenitic Stainless Steel with High Molybdenum and Copper Content --- ### **1. Overview** Outokumpu 904L is a premium, high-alloy **super austenitic stainless steel** renowned for its exceptional resistance to a wide range of corrosive environments, particularly those containing sulfuric acid, phosphoric acid, and chloride ions. Developed for demanding chemical processing applications, it bridges the gap between standard austenitic steels (like 316L) and high-end nickel alloys. Its optimized composition, featuring high levels of chromium, nickel, molybdenum, and the strategic addition of copper, provides superior general corrosion resistance, outstanding resistance to stress corrosion cracking (SCC), and excellent pitting and crevice corrosion resistance. Outokumpu's production ensures high purity, consistent quality, and full traceability. ### **2. Chemical Composition (Weight %, typical)** The composition is precisely balanced to maximize corrosion performance. | Element | Minimum (%) | Typical (%) | Maximum (%) | Notes | |---------|------------|------------|------------|-------| | **Carbon (C)** | - | 0.015 | 0.020 | Very low to prevent sensitization and ensure excellent intergranular corrosion resistance, especially in the as-welded condition. | | **Chromium (Cr)** | 19.0 | 20.0 | 21.0 | Provides fundamental resistance to oxidizing environments and general corrosion. | | **Nickel (Ni)** | 23.0 | 25.0 | 28.0 | High nickel content stabilizes the austenitic structure and provides excellent resistance to reducing environments and stress corrosion cracking. | | **Molybdenum (Mo)** | 4.0 | 4.5 | 5.0 | **Key element** for resistance to pitting and crevice corrosion in chloride-containing media. | | **Copper (Cu)** | 1.0 | 1.5 | 2.0 | **Distinguishing feature.** Enhances resistance to reducing acids, particularly sulfuric acid, and improves general corrosion resistance in many acidic environments. | | **Manganese (Mn)** | - | 1.5 | 2.0 | Austenite stabilizer and for metallurgical control. | | **Silicon (Si)** | - | 0.4 | 0.5 | - | | **Nitrogen (N)** | - | 0.10 | 0.15 | Enhances pitting resistance and strength. | | **Phosphorus (P)** | - | 0.025 | 0.035 | - | | **Sulfur (S)** | - | 0.005 | 0.010 | Very low for improved corrosion resistance and fabricability. | | **Iron (Fe)** | Balance | Balance | Balance | - | ### **3. Physical & Mechanical Properties** *Properties are typical for annealed material at room temperature.* **Mechanical Properties:** * **Tensile Strength (Rm):** 490 - 690 MPa (71 - 100 ksi) * **Yield Strength (Rp0.2):** 220 MPa min (32 ksi min) * **Elongation (A):** 35% min * **Hardness (typical):** 70 - 90 HRB (130 - 190 HV) * **Modulus of Elasticity:** 200 GPa (29 x 10⁶ psi) **Physical Properties:** * **Density:** 8.0 g/cm³ (0.289 lb/in³) * **Melting Range:** 1300 - 1390 °C (2370 - 2535 °F) * **Thermal Conductivity:** 12.6 W/m·K (at 100°C) * **Coefficient of Thermal Expansion:** 15.0 x 10⁻⁶ /K (20-100°C) * **Magnetic Permeability:** Typically < 1.05 (essentially non-magnetic when annealed) **Corrosion Resistance Key Metrics:** * **Pitting Resistance Equivalent Number (PREN):** ~36-37 (PREN = %Cr + 3.3 x %Mo + 16 x %N). Indicates excellent resistance to chloride-induced localized corrosion. * **Critical Pitting Temperature (CPT):** Typically > 50°C in ASTM G48 Method A (6% FeCl₃). * **Stress Corrosion Cracking (SCC):** Excellent resistance in chloride environments compared to standard austenitic grades. ### **4. Key Characteristics** * **Superior Acid Resistance:** Outstanding performance in sulfuric, phosphoric, acetic, and other organic and inorganic acids, especially when copper is present in the acid. * **Excellent Chloride Resistance:** High molybdenum and nitrogen content provide superior resistance to pitting and crevice corrosion in seawater, brackish water, and chloride-containing process streams. * **Outstanding Stress Corrosion Cracking (SCC) Resistance:** The high nickel content makes it vastly more resistant to chloride-induced SCC than standard 304/316 stainless steels. * **Excellent Weldability:** Can be readily welded using common techniques (TIG, MIG, SAW) with matching or over-alloyed filler metals (e.g., AWS A5.14 ER385 or ERNiCrMo-3/4). Low carbon content minimizes carbide precipitation in the heat-affected zone (HAZ). * **Good Fabricability:** Can be cold worked, formed, and machined, though its high work hardening rate requires appropriate techniques and tooling. ### **5. Product Applications** Outokumpu 904L is the material of choice for aggressive chemical processing, pollution control, and marine applications: * **Chemical & Petrochemical Processing:** Heat exchangers, reaction vessels, columns, and piping for sulfuric acid, phosphoric acid, and acetic acid production. * **Pharmaceutical & Fine Chemical:** Process equipment requiring high purity and resistance to aggressive cleaning agents. * **Pollution Control & Flue Gas Desulfurization (FGD):** Ducting, dampers, scrubbers, and chimney liners handling aggressive, wet, acidic environments. * **Oil & Gas (Upstream & Midstream):** Tubing, piping, and components for sour gas (H₂S/CO₂/Cl⁻) service and seawater cooling systems. * **Seawater & Marine Applications:** Pump shafts, valve components, seawater piping, and desalination plant heat rejection sections. * **Pulp & Paper Industry:** Digester and bleaching equipment. ### **6. International Standards & Specifications** Outokumpu 904L conforms to all major international standards. | Region/System | Standard & Designation | Form/Product Standard | |---------------|----------------------|----------------------| | **UNS / ASTM** | **UNS N08904** | Unified Numbering System | | **ASTM / ASME** | **ASTM B625 / ASME SB625** | Plate, Sheet, and Strip | | **ASTM / ASME** | **ASTM B674 / ASME SB674** | Welded Pipe | | **ASTM / ASME** | **ASTM B677 / ASME SB677** | Seamless Pipe and Tube | | **European (EN)** | **1.4539** (X1NiCrMoCu25-20-5) | EN 10088-2 (Sheet/Plate), EN 10216-5 (Seamless Pipe) | | **Germany (DIN)** | **DIN 1.4539** | - | | **Sweden (SS)** | **SS 2562** | - | | **Japan (JIS)** | **SUS 890L** | - | | **ISO** | **ISO 15510: X1NiCrMoCu25-20-5** | - | ### **7. Available Forms & Processing** * **Standard Forms:** Sheet, plate, strip, bar, wire, seamless and welded pipe & tube, fittings, and flanges. * **Condition:** Typically supplied in the **solution annealed** and quenched condition (minimum 1100°C) to dissolve carbides and ensure optimal corrosion resistance. * **Fabrication:** * **Welding:** Use low heat input and matching/over-alloyed fillers (e.g., Outokumpu P12, AWS ER385/ERNiCrMo-3). Post-weld cleaning is essential. * **Machining:** Use positive rake angles, rigid setups, and adequate cooling. It is more challenging to machine than 304/316 due to work hardening. * **Forming:** Good cold formability, but requires more power than standard austenitics. Annealing between severe forming steps is recommended. ### **8. Why Choose Outokumpu 904L?** Outokumpu, as a global leader in stainless steels, provides 904L with: * **Consistent High Quality:** State-of-the-art melting (AOD/VOD) ensures low impurity levels and precise chemistry. * **Full Traceability:** From melt to final product. * **Technical Expertise:** Comprehensive support for material selection, fabrication, and application engineering. * **Proven Performance:** Decades of reliable service in the world's most corrosive environments. --- **Disclaimer:** This datasheet provides general information. Corrosion resistance is highly dependent on specific environmental conditions (temperature, concentration, pH, presence of oxidizers, stagnation). For critical applications, corrosion testing under actual or simulated service conditions is strongly recommended. Always consult Outokumpu's latest technical literature and relevant application engineers for final material selection and fabrication guidelines. -:- For detailed product information, please contact sales. -: Outokumpu 904L High Performance Austenitic Stainless Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7399 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 904L High Performance Austenitic Stainless Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Outokumpu 904L High Performance Austenitic Stainless Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers Outokumpu 904L High Performance Austenitic Stainless Steel Flange -:- For detailed product information, please contact sales. -:

Packing of Outokumpu 904L High Performance Austenitic 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 3870 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