Alloy 28，Incoloy 028 Pipe，UNS N08028,E FORU

British Specs:，American Specs:，German Specs:WS 1.4563

**Product Name:** Alloy 28 / Incoloy® 028 Pipe | UNS N08028 **Material Type:** Nickel-Iron-Chromium-Molybdenum Austenitic Stainless Steel Pipe **Standard:** ASTM B668, ASME SB668, ASTM B690, ASTM B775 --- ### **Overview** Alloy 28 Pipe (UNS N08028), commercially known as **Incoloy® 028**, is a nickel-iron-chromium-molybdenum austenitic stainless steel pipe specifically engineered for handling sulfuric acid and other aggressive chemical media. Available in both seamless and welded configurations, this alloy offers exceptional corrosion resistance, making it ideal for chemical processing, oil and gas, pollution control, and industrial applications where conventional stainless steels fail. --- ### **Key Advantages** - **Superior Sulfuric Acid Resistance:** Excellent performance in sulfuric acid service across various concentrations and temperatures - **Outstanding Chloride Resistance:** Enhanced resistance to pitting and crevice corrosion in chloride environments - **Excellent General Corrosion Resistance:** Suitable for wide range of corrosive media - **Good Mechanical Properties:** High strength and durability under pressure - **Excellent Fabricability:** Easy to weld, form, and install - **Long Service Life:** Reduced maintenance and replacement costs --- ### **Chemical Composition (Typical Weight %)** | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | Nickel (Ni) | 29.0-32.0 | Chromium (Cr) | 26.0-28.0 | | Iron (Fe) | Balance | Molybdenum (Mo) | 3.0-4.0 | | Copper (Cu) | 0.6-1.4 | Manganese (Mn) | ≤2.0 | | Silicon (Si) | ≤1.0 | Carbon (C) | ≤0.03 | | Nitrogen (N) | 0.15-0.25 | Phosphorus (P) | ≤0.03 | | Sulfur (S) | ≤0.03 | | | --- ### **Physical & Mechanical Properties** #### **Physical Properties** - **Density:** 8.0 g/cm³ (0.289 lb/in³) - **Melting Range:** 1370-1400°C (2500-2550°F) - **Thermal Expansion Coefficient:** 15.5 × 10⁻⁶/°C (20-100°C) - **Modulus of Elasticity:** 200 GPa (29 × 10⁶ psi) - **Thermal Conductivity:** 12.0 W/m·K at 100°C - **Specific Heat Capacity:** 450 J/kg·K at 100°C #### **Mechanical Properties (Annealed Condition)** | Property | Typical Value | |----------|---------------| | Tensile Strength | 600-750 MPa (87-109 ksi) | | Yield Strength (0.2% Offset) | 300-400 MPa (44-58 ksi) | | Elongation | 35-50% | | Hardness | 170-220 HB | | Minimum Design Stress | 138 MPa (20 ksi) at 100°C | --- ### **Product Specifications** #### **Pipe Specifications** - **Size Range:** 1/8" to 24" NPS (DN6 to DN600) - **Schedule:** 5S, 10S, 40S, 80S, and custom schedules - **Length:** Random 15-20 feet, cut lengths available - **Types:** Seamless and welded (EFW, ERW) - **Ends:** Plain end, beveled end, threaded and coupled #### **Standard Specifications** - **ASTM B668:** UNS N08028 Seamless and Welded Pipe - **ASME SB668:** Pipe for ASME Code Applications - **ASTM B690:** UNS N08028 Welded Pipe - **ASTM B775:** General Requirements for Nickel Alloy Pipe #### **Dimensional Standards** - **ASTM B668/B690:** Seamless and Welded Pipe - **ASME B36.19:** Stainless Steel Pipe - **ANSI/ASME B36.10:** Welded and Seamless Wrought Steel Pipe --- ### **International Standards & Certifications** - **UNS:** N08028 - **ASTM/ASME:** B668/SB668, B690/SB690 - **EN:** 10216-5 (Technical Delivery Conditions) - **ISO:** 1127 (Stainless Steel Pipe Dimensions) - **Certifications:** NACE MR0175, PED 2014/68/EU, ISO 15156 --- ### **Applications** #### **Chemical Processing Industry** - Sulfuric acid production and handling systems - Phosphoric acid processing lines - Chemical processing and transfer lines - Acid concentration and evaporation systems - Reactor feed and discharge lines - Process interconnecting piping #### **Oil & Gas Industry** - Downhole tubing and casing - Process piping in sour service - Heat exchangers in refining operations - Offshore platform piping systems - Wellhead components #### **Pollution Control** - Flue gas desulfurization (FGD) systems - Scrubbers and absorbers - Waste water treatment plant piping - Chemical waste processing systems #### **Pulp & Paper Industry** - Digester piping systems - Bleaching equipment piping - Chemical recovery systems #### **Industrial Applications** - Industrial chemical transfer lines - Heat exchanger piping systems - Process cooling systems - Industrial furnace components --- ### **Fabrication & Installation** #### **Welding Procedures** - **Preferred Methods:** GTAW (TIG), GMAW (MIG) - **Filler Metals:** Alloy 28, ERNiCrMo-4, ENiCrMo-4 - **Shielding Gas:** 100% Argon for GTAW - **Preheat:** Not required - **Post-Weld Heat Treatment:** Generally not necessary #### **Cutting & Forming** - **Plasma Cutting:** Recommended for precise cuts - **Cold Bending:** Minimum bend radius 3x pipe diameter - **Hot Forming:** 1150-1250°C (2100-2280°F) when required - **Tube Expansion:** Maximum 8-10% of wall thickness #### **Installation** - **Support Spacing:** Standard stainless steel practices - **Expansion Considerations:** Account for thermal expansion - **Gasket Materials:** PTFE, graphite, or alloy 28 spiral wound - **Cleaning:** Thorough cleaning before installation --- ### **Corrosion Resistance** #### **Chemical Resistance** - **Excellent:** Sulfuric acid (various concentrations and temperatures) - **Good:** Phosphoric acid, nitric acid, organic acids - **Resistant:** Chloride pitting and crevice corrosion - **Limited:** Hydrochloric acid, hydrofluoric acid #### **Special Features** - High chromium content provides excellent oxidation resistance - Molybdenum enhances resistance to localized corrosion - Copper addition improves resistance to sulfuric acid - Balanced composition for wide range of corrosive environments --- ### **Quality Assurance** #### **Testing & Inspection** - Hydrostatic testing per applicable standards - Non-destructive examination (RT, UT, PT) - Dimensional verification - Surface finish inspection - Chemical analysis and mechanical testing #### **Certification** - Mill test certificates to EN 10204 3.1/3.2 - Material test reports with full traceability - NACE MR0175/ISO 15156 compliance certification - PED certification for pressure applications --- ### **Pressure-Temperature Ratings** | Temperature (°C) | Maximum Allowable Stress (MPa) | |------------------|-------------------------------| | -29 to 38 | 138 | | 100 | 138 | | 150 | 130 | | 200 | 122 | | 250 | 115 | --- ### **Conclusion** Alloy 28/Incoloy® 028 Pipe offers an exceptional combination of corrosion resistance, mechanical strength, and fabrication versatility for handling aggressive chemical media. Its superior performance in sulfuric acid and chloride-containing environments, combined with excellent weldability and formability, makes it the preferred choice for critical piping systems in chemical processing, oil and gas, pollution control, and industrial applications. The availability in both seamless and welded forms provides engineers with flexible solutions for designing durable, reliable piping systems that ensure long-term performance in corrosive service conditions. --- *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 2693 gallon liquid totes Special package is available on request.