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

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

**Product Name:** Alloy 20 / Incoloy® 020 Plate | UNS N08020 **Material Type:** Nickel-Iron-Chromium Austenitic Stainless Steel Plate **Standard:** ASTM B463, ASME SB463, ASTM A480 --- ### **Overview** Alloy 20 Plate (UNS N08020), commercially known as **Incoloy® 020**, is a nickel-iron-chromium austenitic stainless steel plate specifically formulated for exceptional resistance to sulfuric acid corrosion and other aggressive chemical environments. This plate product combines outstanding corrosion resistance with excellent mechanical properties and fabrication characteristics, making it ideal for pressure vessels, chemical processing equipment, and storage tanks in highly corrosive applications. --- ### **Key Advantages** - **Superior Sulfuric Acid Resistance:** Excellent performance in sulfuric acid service across all concentrations and temperatures - **Chloride Stress Corrosion Cracking Resistance:** Outperforms conventional stainless steels in chloride environments - **Excellent General Corrosion Resistance:** Suitable for wide range of corrosive media including phosphoric and nitric acids - **Good Mechanical Properties:** High strength and toughness maintained through thickness - **Excellent Fabricability:** Good weldability and formability characteristics - **Stabilized Chemistry:** Niobium addition prevents sensitization during welding --- ### **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 (Annealed Condition)** | Property | Typical Value | |----------|---------------| | Tensile Strength | 620-690 MPa (90-100 ksi) | | Yield Strength (0.2% Offset) | 300-415 MPa (44-60 ksi) | | Elongation in 2" | 30-50% | | Hardness | 150-190 HB | | Reduction of Area | 50-70% | --- ### **Product Specifications** #### **Plate Specifications** - **Thickness Range:** 1/8" to 6" (3.0 mm to 150 mm) - **Width Range:** 48" to 120" (1200 mm to 3000 mm) - **Length Range:** 96" to 480" (2400 mm to 12000 mm) - **Surface Finish:** No. 1, 2B, No. 8, or as required - **Condition:** Solution Annealed and Pickled #### **Standard Specifications** - **ASTM B463:** Sheet, Plate, and Strip - **ASME SB463:** Plate for ASME Code Applications - **ASTM A480:** General Requirements for Stainless Steel Flat Products #### **Dimensional Tolerances** - **Thickness Tolerance:** Per ASTM A480 - **Flatness:** Standard and improved categories available - **Shearing Tolerance:** Standard commercial tolerances apply --- ### **International Standards & Certifications** - **UNS:** N08020 - **ASTM/ASME:** B463/SB463 - **EN:** 10088-2 (Material No. 2.4660) - **ISO:** 9443 (Tolerances for Stainless Steel Plate) - **Certifications:** NACE MR0175, PED 2014/68/EU, ISO 15156 --- ### **Applications** #### **Chemical Processing Equipment** - Sulfuric acid pickling tanks and heating coils - Chemical reactors and pressure vessels - Process columns and distillation equipment - Storage tanks for corrosive chemicals - Mixing vessels and agitators #### **Pharmaceutical Industry** - Process vessels and reactors - Storage tanks for acidic solutions - Pharmaceutical intermediate processing equipment - High-purity chemical handling systems #### **Food Processing** - Vinegar production equipment - Acid food processing vessels - Pickle processing tanks - Food grade acid storage systems #### **Industrial Applications** - Pollution control equipment - Waste treatment plant components - Heat exchanger shells and covers - Industrial chemical processing equipment --- ### **Fabrication Characteristics** #### **Welding Procedures** - **Preferred Methods:** GTAW, GMAW, SMAW, SAW - **Filler Metals:** Alloy 20, ERNiCrFe-11, ENiCrFe-2 - **Preheat Temperature:** Not required - **Interpass Temperature:** <150°C (300°F) - **Post-Weld Heat Treatment:** Generally not required #### **Forming & Bending** - **Cold Forming:** Excellent capabilities - **Minimum Bend Radius:** 2-3 times plate thickness - **Hot Forming:** 1050-1200°C (1920-2190°F) when required - **Springback:** Approximately 15-20% for 90° bends #### **Machining** - **Machinability:** 40-50% of B1112 steel - **Cutting Speed:** Moderate speeds with positive rake tools - **Coolant:** Recommended for optimal tool life - **Chip Control:** Produces continuous chips --- ### **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, hydrofluoric acid #### **Special Features** - Copper content provides exceptional sulfuric acid resistance - Niobium stabilization prevents intergranular corrosion - Balanced composition for wide pH range service - Superior to Type 316L and 317L in many corrosive environments --- ### **Quality Assurance** #### **Testing & Inspection** - Chemical analysis certification - Mechanical property testing - Corrosion testing per ASTM A262, Practice E - Ultrasonic testing available - Dimensional verification #### **Certification** - Mill test certificates to EN 10204 3.1/3.2 - Full material traceability - NACE MR0175/ISO 15156 compliance - PED certification for pressure equipment --- ### **Design Allowable Stresses** | Temperature (°C) | Maximum Allowable Stress (MPa) | |------------------|-------------------------------| | -29 to 38 | 138 | | 100 | 138 | | 150 | 128 | | 200 | 119 | | 250 | 111 | --- ### **Conclusion** Alloy 20/Incoloy® 020 Plate offers an exceptional combination of corrosion resistance, mechanical strength, and fabrication versatility for handling sulfuric acid and other aggressive chemicals. Its superior performance in challenging chemical environments, combined with excellent weldability and formability, makes it the preferred choice for pressure vessels, chemical processing equipment, and storage tanks in corrosive service. The plate form provides designers and fabricators with reliable material for constructing durable equipment that ensures long-term performance and cost-effective operation in the most demanding industrial 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 2682 gallon liquid totes Special package is available on request.