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China, Chinese 304/316 Austenitic & 2205 Duplex Stainless Steel Seamless Round Pipe1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Industrial Pipeline PipesStainless Steel Pipe16cr-10ni-2mo/18cr-8ni PipeISO 9001 Certified 2205 Duplex Pipe
EZ Steel Industrial Co., Ltd.
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Product Description Product Description1. Key CharacteristicsPropertyUNS S31803UNS S32205MicrostructureDual-phase (50% austenite, 50% ferrite)Optimized dual-phase balance for enhanced performance.PREN<sup>*</sup>~34-36~35-38StrengthHigh yield strength (450-550 MPa)Higher yield strength (≥550 MPa)Corrosion ResistanceExcellent resistance to chloride stress corrosion cracking (SCC) and pitting.Superior resistance to localized corrosion (e.g., crevice, pitting). 2. Chemical Composition (wt%)ElementUNS S31803UNS S32205RoleCr21.0-23.022.0-23.0Corrosion resistance.Ni4.5-6.54.5-6.5Stabilizes austenite phase.Mo2.5-3.53.0-3.5Enhances pitting resistance.N0.08-0.200.14-0.20Strengthens matrix, improves PREN.Mn≤2.0≤2.0Austenite stabilizer.C≤0.030≤0.030Prevents carbide precipitation.Key Difference: S32205 has tighter control on Mo and N, improving PREN and corrosion performance. 3. Mechanical PropertiesPropertyUNS S31803UNS S32205Yield Strength≥450 MPa≥550 MPaTensile Strength≥620 MPa≥690 MPaElongation≥25%≥25%Hardness (HV)≤290≤310 4. Corrosion ResistanceChloride Environments: Resistant to SCC in seawater, brine, and chloride-rich media.Acidic Media: Performs well in dilute sulfuric acid, acetic acid, and phosphoric acid.Sour Service: Compliant with NACE MR0175/ISO 15156 for H<sub>2</sub>S-containing environments (limited partial pressure).S32205 Advantage: Higher PREN (~38) ensures better resistance to pitting in high-chloride or acidic conditions. 5. ApplicationsOil & Gas: Subsea pipelines, downhole tubing, manifolds.Chemical Processing: Heat exchangers, reactors, acid handling systems.Desalination: Seawater reverse osmosis (SWRO) systems.Pulp & Paper: Bleaching equipment. 6. Manufacturing & WeldingPipe Production:Hot extrusion or cold drawing for seamless pipes.Welded pipes use TIG, laser, or plasma welding.Heat Treatment: Solution annealing at 1020-1100°C, followed by rapid quenching to maintain phase balance.Welding Tips:Use duplex-grade filler metals (e.g., ER2209).Avoid prolonged heat input to prevent sigma phase formation. 7. Standards & CertificationsStandardCoverageASTM A790/A928Seamless/welded duplex stainless pipes.ASME B31.3Process piping design guidelines.NORSOK M-630Material requirements for offshore use. 8. Comparison:S31803: Cost-effective for moderate chloride environments.S32205: Preferred for critical applications (higher PREN, strength, and compliance with modern standards). 9. ChallengesSigma Phase Formation: Risk at 600-900°C; controlled via heat treatment.Welding Complexity: Requires precise parameters to avoid ferrite-austenite imbalance. Processing of Production
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