Alloy 20 / 020，Carpenter 20Cb-3 Foil，Shim，UNS N08020,E FORU

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

**Product Name:** Alloy 20 / Carpenter 20Cb-3® Foil & Shim | UNS N08020 **Material Type:** Nickel-Iron-Chromium Austenitic Stainless Steel Thin-Gauge Products **Standard:** ASTM B463, ASME SB463, ASTM A480 --- ### **Overview** Alloy 20 Foil and Shim (UNS N08020), commercially known as **Carpenter 20Cb-3®**, are precision-engineered thin-gauge products specifically designed for applications requiring exceptional corrosion resistance in minimal thickness configurations. These products maintain the superior sulfuric acid resistance and general corrosion resistance of the alloy while providing the dimensional precision and formability needed for precision components in chemical, pharmaceutical, and electronic applications. --- ### **Key Advantages** - **Exceptional Corrosion Resistance:** Maintains alloy's superior sulfuric acid resistance in thin gauges - **Precision Thickness Control:** Tight tolerances for critical applications - **Excellent Formability:** Suitable for complex stamping and forming operations - **Superior Surface Quality:** Consistent finish for precision applications - **Good Spring Properties:** Suitable for spring applications in corrosive environments - **Cost-Effective Solution:** Reduced material costs through optimized thickness --- ### **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 - **Electrical Resistivity:** 0.90 μΩ·m at 20°C #### **Mechanical Properties (Annealed Condition)** | Property | Foil (≤0.1mm) | Shim (0.1-1.0mm) | |----------|---------------|------------------| | Tensile Strength | 580-650 MPa | 600-670 MPa | | Yield Strength (0.2% Offset) | 270-380 MPa | 280-390 MPa | | Elongation | 35-55% | 30-50% | | Hardness | 140-170 HV | 150-180 HV | --- ### **Product Specifications** #### **Thickness Ranges** - **Precision Foil:** 0.025 mm to 0.1 mm (0.001" to 0.004") - **Shim Stock:** 0.1 mm to 1.0 mm (0.004" to 0.040") - **Width Availability:** Up to 600 mm (24") - **Tolerance:** ±0.005 mm for critical applications #### **Standard Specifications** - **ASTM B463:** Sheet, Plate, and Strip (including foil and shim) - **ASME SB463:** Code Applications - **ASTM A480:** General Requirements #### **Available Conditions** - Annealed (Soft) - 1/4 Hard - 1/2 Hard - Full Hard - Skin Passed --- ### **International Standards & Certifications** - **UNS:** N08020 - **ASTM/ASME:** B463/SB463 - **EN:** 10088-2 (Material No. 2.4660) - **ISO:** 9445 (Tolerances for Cold-Rolled Stainless Steel Narrow Strip) - **Certifications:** NACE MR0175, PED 2014/68/EU, RoHS Compliant --- ### **Applications** #### **Chemical Processing** - Gaskets and seals for chemical equipment - Corrosion-resistant shims and spacers - Filter screen mesh - Chemical sensor components - Laboratory equipment parts #### **Pharmaceutical Industry** - Medical device components - Surgical instrument parts - Pharmaceutical processing shims - Clean room equipment components - Precision medical springs #### **Electronics & Electrical** - Battery contacts and springs - Electrical connector components - EMI/RFI shielding - Precision electrical contacts - Sensor diaphragms #### **Aerospace & Defense** - Precision shims for corrosive environments - Instrumentation components - Control system parts - Sensor elements - Guidance system components #### **General Industrial** - Precision springs for corrosive service - Small valve components - Metering device parts - Bearing seals and retainers - Specialized fasteners --- ### **Fabrication Characteristics** #### **Stamping & Forming** - **Deep Drawing:** Excellent in annealed condition - **Blank Size:** Generous allowances for formed parts - **Bend Radius:** Minimum 1T for 90° bends - **Springback:** Predictable and consistent #### **Heat Treatment** - **Solution Annealing:** 925-1010°C (1700-1850°F) - **Stress Relieving:** 425-480°C (800-900°F) - **Atmosphere:** Bright annealing available #### **Joining Methods** - **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 stress corrosion cracking - **Limited:** Hydrochloric acid service #### **Special Features** - Consistent corrosion resistance through thickness - Suitable for wide pH range applications - Excellent pitting resistance - Good crevice corrosion resistance --- ### **Quality Assurance** #### **Testing & Inspection** - Chemical analysis certification - Mechanical property testing - Corrosion testing per ASTM A262 - Dimensional verification - Surface quality inspection #### **Certification** - Mill test certificates - Full material traceability - RoHS compliance documentation - REACH compliance --- ### **Packaging & Handling** #### **Standard Packaging** - Protective interleaving - Moisture-proof wrapping - Precision wound on cores - Individual sheet separation #### **Special Packaging** - Clean room packaging - Vacuum sealing - Desiccant inclusion - Custom packaging available --- ### **Design Considerations** #### **Technical Support** - Material selection assistance - Fabrication process optimization - Application engineering support - Prototype development services #### **Custom Solutions** - Special widths and lengths - Custom tempers - Special surface finishes - Slit-to-width capabilities --- ### **Conclusion** Alloy 20/Carpenter 20Cb-3® Foil and Shim products provide an exceptional combination of corrosion resistance, precision manufacturing, and fabrication versatility for thin-gauge applications in aggressive chemical environments. Their superior performance in sulfuric acid and other corrosive media, combined with excellent formability and consistent quality, makes them the material of choice for precision components in chemical processing, pharmaceutical, electronics, and aerospace industries. The availability in various tempers and precise thicknesses ensures optimal solutions for both forming and spring applications where corrosion resistance and dimensional accuracy are critical. --- *Carpenter 20Cb-3® is a registered trademark of Carpenter Technology 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 2675 gallon liquid totes Special package is available on request.