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

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

**Product Name:** Alloy 20 / Carpenter 20Cb-3® Strip | UNS N08020 **Material Type:** Nickel-Iron-Chromium Austenitic Stainless Steel Strip **Standard:** ASTM B463, ASME SB463, ASTM A480 --- ### **Overview** Alloy 20 Strip (UNS N08020), commercially known as **Carpenter 20Cb-3®**, is a precision-rolled nickel-iron-chromium austenitic stainless steel strip specifically engineered for superior resistance to sulfuric acid corrosion and other aggressive chemical environments. This thin-gauge product combines exceptional corrosion resistance with excellent formability and spring properties, making it ideal for manufacturing springs, clips, washers, and other precision components in corrosive applications. --- ### **Key Advantages** - **Excellent Sulfuric Acid Resistance:** Superior performance in sulfuric acid environments - **Precision Gauge Control:** Tight thickness tolerances for critical applications - **Superior Spring Properties:** High strength and excellent elastic recovery - **Excellent Formability:** Suitable for complex stamping and forming operations - **Good Weldability:** Compatible with standard welding techniques - **Cost-Effective:** Long service life reduces replacement frequency --- ### **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 | Typical Value | |----------|---------------| | Tensile Strength | 600-670 MPa (87-97 ksi) | | Yield Strength (0.2% Offset) | 280-390 MPa (41-57 ksi) | | Elongation | 35-55% | | Hardness | 140-180 HB | | Modulus of Elasticity | 186 GPa (27 × 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 B463:** UNS N08020 Strip - **ASME SB463:** 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:** N08020 - **ASTM/ASME:** B463/SB463 - **EN:** 10088-2 (Material No. 2.4660) - **ISO:** 9445 (Tolerances for Stainless Steel Strip) - **Certifications:** NACE MR0175, PED 2014/68/EU --- ### **Applications** #### **Spring Applications** - Chemical processing spring clips - Valve spring components - Electrical connector springs - Medical device springs - Instrumentation springs #### **Electrical & Electronic** - Battery contacts and clips - Electrical connector components - Shielding applications - Precision electrical contacts #### **Chemical Processing** - Filter screen mesh - Sieve components - Small chemical vessel linings - Process equipment components #### **Medical Devices** - Surgical instrument components - Implantable device parts - Medical spring elements - Diagnostic equipment components #### **Food Processing** - Food processing springs - Filter screen components - Processing equipment parts --- ### **Fabrication Characteristics** #### **Stamping & Forming** - **Deep Drawing:** Excellent capabilities 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:** 925-1010°C (1700-1850°F) - **Stress Relieving:** 425-480°C (800-900°F) - **Atmosphere:** Bright annealing available #### **Welding & Joining** - **Resistance Welding:** Excellent capabilities - **Laser Welding:** Suitable for precision applications - **Brazing:** Standard techniques applicable --- ### **Corrosion Resistance** #### **Chemical Resistance** - **Excellent:** Sulfuric acid environments - **Good:** Phosphoric acid, nitric acid - **Resistant:** Chloride stress corrosion cracking - **Limited:** Hydrochloric acid service #### **Special Features** - Copper content enhances sulfuric acid resistance - Niobium stabilization prevents sensitization - 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 A262 - Dimensional verification - Surface quality inspection #### **Certification** - Mill test certificates - Full material traceability - RoHS compliance - REACH compliance --- ### **Design Considerations** #### **Spring Design Parameters** | Property | Annealed | Full Hard | |----------|----------|-----------| | Tensile Strength (MPa) | 600-670 | 950-1100 | | Yield Strength (MPa) | 280-390 | 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 --- ### **Conclusion** Alloy 20/Carpenter 20Cb-3® Strip provides an exceptional combination of corrosion resistance, mechanical properties, and fabrication characteristics for precision component manufacturing. Its superior performance in sulfuric acid and other corrosive environments, combined with excellent formability and spring properties, makes it the material of choice for springs, clips, and precision parts in chemical processing, medical, electrical, and food industries. The strip form offers manufacturers a reliable, cost-effective solution for producing durable components that ensure long-term performance in demanding corrosive applications. --- *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 2671 gallon liquid totes Special package is available on request.