Outokumpu 904L High Performance Austenitic Stainless Steel Tube,Pipe

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

Packing of Outokumpu 904L High Performance Austenitic 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 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