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

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

**Product Name:** Alloy 28 / Incoloy® 028 Strip | UNS N08028 **Material Type:** Nickel-Iron-Chromium-Molybdenum Austenitic Stainless Steel Strip **Standard:** ASTM B668, ASME SB668, ASTM A480 --- ### **Overview** Alloy 28 Strip (UNS N08028), commercially known as **Incoloy® 028**, is a precision-rolled nickel-iron-chromium-molybdenum austenitic stainless steel strip specifically engineered for applications requiring exceptional corrosion resistance in thin-gauge configurations. This product maintains the superior sulfuric acid resistance and chloride corrosion resistance of the alloy while providing precise dimensional control and excellent formability for manufacturing springs, clips, washers, and other precision components in corrosive environments. --- ### **Key Advantages** - **Exceptional Corrosion Resistance:** Maintains superior sulfuric acid and chloride resistance in thin gauges - **Precision Thickness Control:** Tight tolerances for critical applications - **Excellent Formability:** Suitable for complex stamping and forming operations - **Superior Spring Properties:** High strength and excellent elastic recovery - **Good Weldability:** Compatible with standard welding techniques - **High Temperature Stability:** Maintains properties at elevated temperatures --- ### **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 - **Electrical Resistivity:** 0.85 μΩ·m at 20°C #### **Mechanical Properties (Annealed Condition)** | Property | Typical Value | |----------|---------------| | Tensile Strength | 580-720 MPa (84-104 ksi) | | Yield Strength (0.2% Offset) | 280-380 MPa (41-55 ksi) | | Elongation | 40-60% | | Hardness | 160-200 HB | | Modulus of Elasticity | 200 GPa (29 × 10⁶ psi) | --- ### **Product Specifications** #### **Strip Specifications** - **Thickness Range:** 0.05 mm to 2.0 mm (0.002" to 0.080") - **Width Range:** 2 mm to 600 mm (0.080" to 24") - **Temper:** Annealed, 1/4 Hard, 1/2 Hard, Full Hard - **Surface Finish:** 2B, BA, or as specified - **Edge Condition:** Slit edge, round edge, square edge #### **Standard Specifications** - **ASTM B668:** UNS N08028 Strip - **ASME SB668:** Strip for ASME Code Applications - **ASTM A480:** General Requirements #### **Available Conditions** - Annealed (Soft) - Cold Rolled (Various tempers) - Solution Annealed - Skin Passed --- ### **International Standards & Certifications** - **UNS:** N08028 - **ASTM/ASME:** B668/SB668 - **EN:** 1.4563 (X1NiCrMoCu31-27-4) - **DIN:** 2.4603 - **ISO:** 9445 (Tolerances for Stainless Steel Strip) - **Certifications:** NACE MR0175, PED 2014/68/EU --- ### **Applications** #### **Spring Applications** - Chemical processing spring clips - Valve springs for corrosive service - Electrical connector springs - Medical device springs - Instrumentation springs - High-temperature springs #### **Chemical Processing** - Filter screen mesh - Sieve components - Small chemical vessel linings - Process equipment components - Gaskets and seals #### **Oil & Gas Industry** - Downhole tool components - Wellhead equipment springs - Corrosion-resistant fasteners - Sensor components #### **Medical Devices** - Surgical instrument components - Implantable device parts - Medical spring elements - Diagnostic equipment components #### **Electronics & Electrical** - Battery contacts and clips - Electrical connector components - EMI/RFI shielding - Precision electrical contacts --- ### **Fabrication Characteristics** #### **Stamping & Forming** - **Deep Drawing:** Excellent in annealed condition - **Bending:** Minimum bend radius 1-2 times thickness - **Blank Size:** Generous allowances for formed parts - **Springback:** Predictable and consistent #### **Heat Treatment** - **Solution Annealing:** 1150-1200°C (2100-2190°F) - **Stress Relieving:** 500-550°C (930-1020°F) - **Atmosphere:** Bright annealing available #### **Welding & Joining** - **Resistance Welding:** Excellent capabilities - **Laser Welding:** Suitable for precision applications - **Brazing:** Standard techniques applicable - **Adhesive Bonding:** Compatible with various adhesives --- ### **Corrosion Resistance** #### **Chemical Resistance** - **Excellent:** Sulfuric acid environments - **Good:** Phosphoric acid, nitric acid - **Resistant:** Chloride pitting and crevice corrosion - **Limited:** Hydrochloric acid service #### **Special Features** - High chromium content provides excellent oxidation resistance - Molybdenum enhances resistance to localized corrosion - Copper addition improves resistance to sulfuric acid - Consistent corrosion resistance through thickness - Suitable for wide pH range applications --- ### **Quality Assurance** #### **Testing & Inspection** - Chemical analysis certification - Mechanical property testing - Corrosion testing per ASTM G48 - Dimensional verification - Surface quality inspection #### **Certification** - Mill test certificates - Full material traceability - NACE MR0175/ISO 15156 compliance - RoHS and REACH compliance --- ### **Design Considerations** #### **Spring Design Parameters** | Property | Annealed | Full Hard | |----------|----------|-----------| | Tensile Strength (MPa) | 580-720 | 900-1100 | | Yield Strength (MPa) | 280-380 | 800-950 | | Elastic Limit | Low | High | | Formability | Excellent | Limited | #### **Fabrication Tips** - Use proper tool clearances for stamping - Maintain clean processing environment - Avoid carbon steel contamination - Proper storage to prevent surface damage - Follow recommended heat treatment procedures --- ### **Conclusion** Alloy 28/Incoloy® 028 Strip provides an exceptional combination of corrosion resistance, mechanical properties, and fabrication characteristics for precision component manufacturing. Its superior performance in sulfuric acid and chloride-containing environments, combined with excellent formability and spring properties, makes it the material of choice for springs, clips, and precision parts in chemical processing, oil and gas, medical, and electronics industries. The strip form offers manufacturers a reliable, cost-effective solution for producing durable components that ensure long-term performance in 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.*

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 2697 gallon liquid totes Special package is available on request.