Alloy 20 / 020，Incoloy 020 Fittings，,E FORU

British Specs:，American Specs:，German Specs: WS 2.4660

**Product Name:** Alloy 20 / Incoloy® 020 Fittings | UNS N08020 **Material Type:** Nickel-Iron-Chromium Austenitic Stainless Steel Fittings **Standard:** ASTM B366, ASME SB366, MSS SP-43, ASME B16.9, ASME B16.11 --- ### **Overview** Alloy 20 Fittings (UNS N08020), commercially known as **Incoloy® 020**, are precision-engineered components manufactured from nickel-iron-chromium austenitic stainless steel, specifically designed for handling sulfuric acid and other aggressive chemical media. These fittings provide exceptional corrosion resistance and reliability in chemical processing, pharmaceutical, and industrial piping systems where conventional stainless steels would fail. --- ### **Key Advantages** - **Superior Sulfuric Acid Resistance:** Excellent performance in sulfuric acid service across all concentrations - **Chloride Stress Corrosion Cracking Resistance:** Outperforms 300-series stainless steels - **Excellent General Corrosion Resistance:** Suitable for wide range of corrosive media - **High Pressure Capability:** Robust design for demanding service conditions - **Easy Installation:** Standard dimensions for compatibility with existing systems - **Long Service Life:** Reduced maintenance and replacement costs --- ### **Chemical Composition (Typical Weight %)** | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | Nickel (Ni) | 32.0-38.0 | Chromium (Cr) | 19.0-21.0 | | Iron (Fe) | Balance | Molybdenum (Mo) | 2.0-3.0 | | Copper (Cu) | 3.0-4.0 | Manganese (Mn) | ≤2.0 | | Silicon (Si) | ≤1.0 | Carbon (C) | ≤0.07 | | Niobium (Nb) | 8×C-1.0 | Phosphorus (P) | ≤0.045 | | Sulfur (S) | ≤0.035 | | | --- ### **Physical & Mechanical Properties** #### **Physical Properties** - **Density:** 8.08 g/cm³ (0.292 lb/in³) - **Melting Range:** 1440-1500°C (2620-2730°F) - **Thermal Expansion Coefficient:** 15.9 × 10⁻⁶/°C (20-100°C) - **Modulus of Elasticity:** 186 GPa (27 × 10⁶ psi) - **Thermal Conductivity:** 12.9 W/m·K at 100°C - **Specific Heat Capacity:** 500 J/kg·K at 100°C #### **Mechanical Properties (Solution Annealed)** | Property | Typical Value | |----------|---------------| | Tensile Strength | 620-690 MPa (90-100 ksi) | | Yield Strength (0.2% Offset) | 300-415 MPa (44-60 ksi) | | Elongation | 30-50% | | Hardness | 150-190 HB | | Impact Strength | 100-150 J (74-111 ft-lb) | --- ### **Product Specifications** #### **Available Fitting Types** - **Butt-Weld Fittings:** Elbows (45°, 90°, 180°), tees, reducers, caps, stub ends - **Socket-Weld Fittings:** Unions, elbows, tees, couplings, plugs - **Threaded Fittings:** NPT threads per ASME B1.20.1 - **Special Fittings:** Crosses, lap joint stub ends, nozzle fittings #### **Size Ranges** - **Butt-Weld:** 1/2" to 24" NPS (DN15 to DN600) - **Socket-Weld:** 1/8" to 4" NPS (DN6 to DN100) - **Threaded:** 1/8" to 2" NPS (DN6 to DN50) #### **Standards Compliance** - **ASME B16.9:** Factory-made wrought butt-welding fittings - **ASME B16.11:** Forged steel fittings, socket-welding and threaded - **MSS SP-43:** Wrought stainless steel butt-welding fittings - **ISO 4144:** Stainless steel fittings threaded ends --- ### **International Standards & Certifications** - **UNS:** N08020 - **ASTM/ASME:** B366/SB366 - **EN:** 10253-4 (Butt-welding pipe fittings) - **PED:** 2014/68/EU Category I/IV - **Certifications:** NACE MR0175, ISO 15156, ASME B31.3 --- ### **Applications** #### **Chemical Processing Industry** - Sulfuric acid piping systems - Chemical processing plant piping - Acid concentration systems - Reactor feed and discharge lines - Process interconnecting piping - Heat exchanger connections #### **Pharmaceutical Industry** - Process piping for acid-based reactions - CIP (Clean-in-Place) systems - High-purity chemical transfer lines - Pharmaceutical intermediate processing - Bioreactor piping systems #### **Food Processing** - Vinegar production lines - Acid food product processing - Pickle processing equipment - Food grade acid handling systems #### **Industrial Applications** - Pollution control systems - Waste treatment plant piping - Industrial chemical transfer systems - Heat exchanger piping connections - Marine and offshore applications --- ### **Fabrication & Installation** #### **Welding Procedures** - **Preferred Methods:** GTAW (TIG), GMAW (MIG) - **Filler Metals:** Alloy 20, ERNiCrFe-11, ENiCrFe-2 - **Shielding Gas:** 100% Argon for GTAW - **Purge Gas:** Required for interior protection - **Heat Input Control:** Moderate to low recommended #### **Installation Guidelines** - **Alignment:** Proper alignment before welding - **Gap Control:** Maintain consistent root gap - **Cleaning:** Thorough cleaning before welding - **Support:** Adequate support during installation - **Inspection:** Visual and NDE as required #### **Quality Control** - **Visual Inspection:** 100% visual examination - **Dimensional Check:** Verify all critical dimensions - **Surface Finish:** Ensure proper surface condition - **Marking:** Clear identification per specifications - **Traceability:** Full material traceability maintained --- ### **Corrosion Resistance** #### **Chemical Resistance** - **Excellent:** Sulfuric acid (all concentrations to 95°C) - **Good:** Phosphoric acid, nitric acid, organic acids - **Resistant:** Chloride stress corrosion cracking - **Limited:** Hydrochloric acid, oxidizing chlorides #### **Special Features** - Copper content enhances sulfuric acid resistance - Niobium stabilization prevents sensitization - Balanced composition for wide corrosion resistance - Superior to 316L and 317L in many applications --- ### **Quality Assurance** #### **Testing & Inspection** - Liquid penetrant testing - Hydrostatic testing - Dimensional verification - Material certification - Traceability documentation #### **Certification** - Mill test certificates to EN 10204 3.1/3.2 - Full material traceability - NACE MR0175/ISO 15156 compliance - PED certification for pressure applications --- ### **Pressure-Temperature Ratings** | Temperature (°C) | Maximum Allowable Pressure (bar) | |------------------|---------------------------------| | -29 to 38 | 52 | | 100 | 52 | | 150 | 48 | | 200 | 45 | | 250 | 42 | *Based on Schedule 40 fittings* --- ### **Conclusion** Alloy 20/Incoloy® 020 Fittings provide an exceptional combination of corrosion resistance, mechanical strength, and reliability for handling aggressive chemical media in piping systems. Their superior performance in sulfuric acid and chloride-containing environments, combined with strict adherence to international standards, makes them the preferred choice for critical applications in chemical processing, pharmaceutical, and industrial sectors. The comprehensive quality assurance and certification ensure these fittings deliver long-term, trouble-free service in the most demanding corrosive applications. --- *Incoloy® is a registered trademark of Special Metals Corporation. All technical data are typical values and should be verified for specific applications. Consult manufacturer's specifications for project-specific requirements and applicable codes and standards.*

Packing of Standard Packing: 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 2685 gallon liquid totes Special package is available on request.