Sandvik,3RE60

Sandvik 3RE60 Seamless tube and pipe Product Information -:- For detailed product information, please contact sales. -: Sandvik 3RE60 Seamless tube and pipe Synonyms -:- For detailed product information, please contact sales. -:

Sandvik 3RE60 Seamless tube and pipe Product Information -:- For detailed product information, please contact sales. -: # **Product Name: Sandvik 3RE60 Seamless Tube and Pipe (UNS S31500 / EN 1.4417)** ## **Introduction** Sandvik 3RE60 is a **ferritic-austenitic (duplex) stainless steel** specifically developed for outstanding resistance to **stress corrosion cracking (SCC)** in hot chloride and caustic environments. Representing one of the earlier generations of duplex alloys, it is engineered to fill the critical performance gap between standard austenitic steels (like 316L) and nickel-based alloys. Sandvik 3RE60 seamless tubes and pipes are the preferred choice for **heat exchangers, condensers, and piping systems** operating in environments where chloride-induced SCC is the primary failure mechanism, offering a cost-effective and highly reliable solution. ## **Key Features** * **Exceptional Stress Corrosion Cracking (SCC) Resistance:** The primary design objective. Provides superior resistance to chloride-induced SCC compared to 300-series austenitic stainless steels, especially in the temperature range of 60-200°C. * **Good General and Pitting Corrosion Resistance:** Offers better resistance to pitting and crevice corrosion than Type 304L, and comparable or better resistance than Type 316L in many environments. * **Higher Mechanical Strength:** Delivers approximately 50% higher yield strength than standard austenitic grades, allowing for thinner walls and improved pressure ratings. * **Good Weldability:** Can be welded using standard procedures with appropriate duplex filler metals. --- ## **1. Chemical Composition (Typical Weight % - Sandvik Specification)** The composition is balanced for SCC resistance with moderate alloy content. | Element | Content (%) | Element | Content (%) | | :------------- | :------------ | :------------- | :---------- | | Chromium (Cr) | 18.0 - 19.0 | Nickel (Ni) | 4.25 - 5.25 | | Molybdenum (Mo)| 2.50 - 3.00 | **Nitrogen (N)**| **≤ 0.10** | | Manganese (Mn) | 1.20 - 2.00 | Silicon (Si) | 1.40 - 2.00 | | Carbon (C) | ≤ 0.030 | | | | **Iron (Fe)** | **Balance** | | | **Key Alloying Note:** Characterized by a **lower chromium and higher silicon content** compared to modern duplex grades like 2205. The silicon enhances resistance to hot concentrated acids and SCC. **PREN Calculation:** PREN = %Cr + 3.3(%Mo) + 16(%N) ≈ **26 - 29** (Note: Low N content limits PREN compared to newer duplex grades). --- ## **2. Physical & Mechanical Properties (Typical - Solution Annealed)** | Property | Value / Range | | :-------------------------------------------- | :-------------------------------- | | Density | 7.7 g/cm³ | | Thermal Conductivity (20°C) | ~17 W/m·K | | Coefficient of Thermal Expansion (20-100°C) | ~13.0 x 10⁻⁶ /K | | Modulus of Elasticity | 200 GPa | | **Tensile Strength (Rm)** | **630 - 830 MPa** | | **Yield Strength (Rp0.2)** | **≥ 440 MPa** | | **Elongation (A)** | **≥ 30 %** | | Hardness (HB) | 220 - 270 HBW | --- ## **3. Product Forms & Applications** **Available Product Forms (Seamless):** * **Heat Exchanger Tubes:** Cold drawn, annealed, and pickled. Supplied to precise dimensional tolerances (e.g., ASTM A789). * **Pressure Pipe:** For process piping systems. * **Sizes:** A wide range of outside diameters and wall thicknesses is available. **Primary Applications (Targeted SCC Service):** 3RE60 is a specialist grade for specific, severe environments: * **Heat Exchangers & Condensers:** Tube bundles for cooling processes with brackish water, seawater (with limitations), or process streams containing chlorides, especially at elevated temperatures (e.g., in refinery overhead condensers, chemical plant coolers). * **Pulp & Paper Industry:** Evaporator tubes, heater tubes, and piping in chemical recovery sections exposed to chloride-containing liquors. * **Chemical Processing:** Piping and tubing for handling hot organic acids, phosphoric acid, and sulfate solutions. * **Geothermal and Power Plants:** Tubing for certain feedwater heaters and coolers where SCC is a risk. --- ## **4. International Standards & Approvals** 3RE60 is a well-established grade with clear standard designations. | Standard Type | Standard Number & Designation | Notes | | :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- | | **Unified Numbering System (UNS)** | **S31500** | The standard UNS designation. | | **EN / EURONORM (Europe)** | **1.4417** (Old Werkstoff Nr. 1.4438) | Common European material number. | | **ASTM (USA)** | **ASTM A789/A789M** (Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service) | The primary specification for seamless tubes. | | | **ASTM A790/A790M** (Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe) | The primary specification for seamless pipe. | | **Other Standards** | **DIN 17459** | German standard for stainless steel tubes. | | **Key Procurement Specification** | **Sandvik 3RE60 Technical Datasheet** alongside **ASTM A789 S31500** or **ASTM A790 S31500**. | The Sandvik datasheet provides detailed application-specific guidance. | --- ## **Critical Technical & Procurement Note** **3RE60 is a classic, purpose-driven duplex alloy. Its selection should be based on specific service conditions, not as a general substitute for modern duplex grades.** 1. **Procurement Specification:** Specify **"Sandvik 3RE60 (UNS S31500) to ASTM A789/A790"**. Clearly state the product type (tube or pipe), dimensions, and testing requirements (e.g., hydrostatic, eddy current). 2. **Application Boundaries:** * **Strengths:** **Unmatched for hot chloride SCC resistance** in its class. Excellent for many acid services. * **Limitations:** **Not a seawater alloy.** Its pitting resistance (PREN ~28) is lower than 2205 (PREN ≥34). It is **not suitable for immersion in stagnant or slow-moving seawater** or other high-chloride environments where pitting is the dominant threat. 3. **Fabrication & Welding:** Requires standard duplex welding procedures. Post-weld heat treatment is generally not required for thin-walled tubes but may be considered for heavy sections. Filler metal 3RE69 is typically used. 4. **Certification:** Require a **Sandvik Mill Test Certificate** confirming chemistry (notably the Si content of 1.4-2.0%), mechanical properties, and non-destructive test results. For heat exchanger tubes, certification to **ASTM A450** (general requirements) is common. 5. **Modern Context:** While newer duplex grades (2205, 2507) offer higher overall strength and pitting resistance, **3RE60 remains the material of choice for its specific, proven performance in hot chloride SCC applications**, often where newer grades have not been tested or approved. It is a specialized tool for a specific problem. -:- For detailed product information, please contact sales. -: Sandvik 3RE60 Seamless tube and pipe Specification Dimensions Size： Diameter 20-1000 mm Length <7301 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. -: Sandvik 3RE60 Seamless tube and pipe Properties -:- For detailed product information, please contact sales. -:

Applications of Sandvik 3RE60 Seamless tube and pipe -:- For detailed product information, please contact sales. -: Chemical Identifiers Sandvik 3RE60 Seamless tube and pipe -:- For detailed product information, please contact sales. -:

Packing of Sandvik 3RE60 Seamless tube and pipe -:- 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 Sheet/Plate 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 3772 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