DP-3 Duplex Stainless Steel (UNS S31260)

DP-3 Duplex Stainless Steel (UNS S31260) Product Information -:- For detailed product information, please contact sales. -: DP-3 Duplex Stainless Steel (UNS S31260) Synonyms -:- For detailed product information, please contact sales. -:

DP-3 Duplex Stainless Steel (UNS S31260) Product Information -:- For detailed product information, please contact sales. -: **Product Name:** DP-3 Duplex Stainless Steel (UNS S31260) **Introduction:** DP-3 (UNS S31260) is a **super duplex stainless steel** belonging to the second-generation duplex family. It features an optimized microstructure comprising approximately equal proportions of ferrite (α) and austenite (γ) phases. This alloy is designed to offer **exceptional strength**, **outstanding corrosion resistance**—particularly against chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion—and **good weldability**. It bridges the gap between standard duplex grades like 2205 (S32205/S31803) and high-alloy austenitic steels, providing a cost-effective solution for demanding environments. **Key Features:** * **High Strength:** Yield strength is approximately double that of conventional austenitic stainless steels (e.g., 316L), allowing for reduced wall thickness and weight savings. * **Excellent Corrosion Resistance:** Superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-containing media. * **Good Weldability:** Designed for reliable welding using appropriate duplex-grade filler metals and procedures. * **Favorable Mechanical Properties:** Combines high strength with good toughness and ductility. --- **1. Chemical Composition (Typical Weight %)** The composition is carefully balanced to promote a stable austenite-ferrite phase balance and achieve the desired properties. | Element | Content (%) | Element | Content (%) | | :-------- | :---------- | :------ | :---------- | | Chromium | 24.0 - 26.0 | Nickel | 5.5 - 7.5 | | Molybdenum| 2.5 - 3.5 | Nitrogen | 0.10 - 0.30 | | Manganese | ≤ 1.00 | Copper | 0.20 - 0.80 | | Silicon | ≤ 0.50 | Carbon | ≤ 0.030 | | Phosphorus| ≤ 0.030 | Sulfur | ≤ 0.020 | | Tungsten | 0.10 - 0.50 | Iron | Balance | *Note: The presence of Tungsten (W) further enhances corrosion resistance, especially in acidic environments.* --- **2. Physical & Mechanical Properties (Typical at Room Temperature)** | Property | Value / Range | | :-------------------------------- | :-------------------------------- | | Density | ≈ 7.8 g/cm³ | | Melting Range | ≈ 1420 - 1465 °C | | Specific Heat Capacity (20°C) | ≈ 500 J/kg·K | | Thermal Conductivity (20°C) | ≈ 15 W/m·K | | Coefficient of Thermal Expansion (20-100°C) | ≈ 13 x 10⁻⁶ /K | | Modulus of Elasticity (Tensile) | ≈ 200 GPa | | **Tensile Strength (Rm)** | **≥ 750 MPa** | | **Yield Strength (Rp0.2)** | **≥ 550 MPa** | | **Elongation (A)** | **≥ 25 %** | | Hardness (Brinell) | ≤ 290 HBW | | Impact Toughness (Charpy V-notch) | Typically > 100 J at -40°C | --- **3. Product Forms & Applications** **Available Product Forms:** * Plate and Sheet * Seamless and Welded Tubes & Pipe * Bar, Rod, and Wire * Forgings and Fittings * Welding Consumables (Rod, Wire) **Primary Applications:** * **Oil & Gas Industry:** Downhole tubing, flow lines, pipelines, pressure vessels, and components in sour service (H₂S-containing) environments. Heat exchangers in offshore platforms. * **Chemical & Petrochemical Processing:** Reactors, columns, tanks, and piping systems handling corrosive chemicals, acids, and chlorides. * **Marine & Offshore:** Seawater handling systems, pumps, valves, shafts, and desalination plant components (e.g., RO high-pressure piping). * **Pollution Control:** Flue gas desulfurization (FGD) systems, scrubbers, and effluent treatment equipment. * **Pulp & Paper Industry:** Digesters, bleach plants, and other equipment exposed to corrosive liquors. * **General Mechanical Engineering:** High-strength structural components requiring corrosion resistance. --- **4. International Standards & Approvals** UNS S31260 is covered by various international material standards. Designations and equivalents may vary slightly. | Standard Type | Standard Number & Designation | Notes | | :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- | | **Unified Numbering System (UNS)** | **S31260** | Primary U.S. designation. | | **ASTM (USA)** | ASTM A240 (Plate, Sheet, Strip)
ASTM A790 / A789 (Seamless/Welded Pipe & Tube)
ASTM A182 (Forgings & Fittings)
ASTM A276 (Bar) | Commonly specified for pressure vessels and general construction. | | **EN / EURONORM (Europe)** | **1.4507** (Old Werkstoff Nr.) | The common European material number. | | | EN 10088-2: Stainless steel sheet/plate, strip
EN 10216-5: Seamless pressure tubes
EN 10253-4: Butt-welding fittings | | | **NACE MR0175/ISO 15156** | **Compliant** | Approved for use in sour service (H₂S) environments within specified limits. | | **Other National Standards** | JIS G4304 / G4305 (Japan)
GB/T 20878 (China) - May have a corresponding designation. | Specific grades should be cross-referenced. | **Important Note on Specifications:** This technical data is for reference only. The exact chemical composition, mechanical properties, and permissible product forms are defined by the relevant purchase specification, standard, and heat treatment condition. Users must consult the specific standard and supplier's certified material test report for guaranteed values. Proper fabrication and welding procedures are critical to maintain the properties of duplex stainless steels. -:- For detailed product information, please contact sales. -: DP-3 Duplex Stainless Steel (UNS S31260) Specification Dimensions Size： Diameter 20-1000 mm Length <7270 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. -: DP-3 Duplex Stainless Steel (UNS S31260) Properties -:- For detailed product information, please contact sales. -:

Applications of DP-3 Duplex Stainless Steel (UNS S31260) -:- For detailed product information, please contact sales. -: Chemical Identifiers DP-3 Duplex Stainless Steel (UNS S31260) -:- For detailed product information, please contact sales. -:

Packing of DP-3 Duplex Stainless Steel (UNS S31260) -:- 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 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 3741 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