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

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

**Product Name:** Alloy 20 / Carpenter 20Cb-3® Rod | UNS N08020 **Material Type:** Nickel-Iron-Chromium Austenitic Stainless Steel Rod **Standard:** ASTM B473, ASME SB473, ASTM A479 --- ### **Overview** Alloy 20 Rod (UNS N08020), commercially known as **Carpenter 20Cb-3®**, is a nickel-iron-chromium austenitic stainless steel rod specifically formulated for superior resistance to sulfuric acid and other aggressive chemicals. The rod form provides excellent machining characteristics and mechanical properties, making it ideal for manufacturing critical components in chemical processing, pharmaceutical, and food processing industries. --- ### **Key Advantages** - **Superior Sulfuric Acid Resistance:** Optimal performance in sulfuric acid environments - **Excellent Machinability:** Better machining characteristics than conventional stainless steels - **Chloride Stress Corrosion Cracking Resistance:** Superior to 300-series stainless steels - **Good Mechanical Properties:** High strength combined with excellent ductility - **Stabilized Chemistry:** Niobium addition prevents sensitization - **Versatile Applications:** Suitable for various corrosive environments --- ### **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:** 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 - **Magnetic Permeability:** Typically <1.02 (Annealed condition) #### **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** #### **Available Forms & Sizes** - **Diameter Range:** 1/8" to 12" (3mm to 300mm) - **Lengths:** Standard 10-20 feet, cut lengths available - **Conditions:** Hot finished, cold finished, centerless turned - **Surface Finish:** Black, peeled, turned, polished #### **Standard Specifications** - **ASTM B473:** UNS N08020 Bar and Wire - **ASTM A479:** Stainless Steel Bars for Pressure Vessels - **ASME SB473:** Equivalent to ASTM B473 for ASME Code - **ASTM A484:** General Requirements for Stainless Steel Bars --- ### **International Standards & Certifications** - **UNS:** N08020 - **ASTM/ASME:** B473/SB473, A479/SA479 - **EN:** Not standardized, but supplied to customer specifications - **Certifications:** NACE MR0175, PED 2014/68/EU, ISO 15156 --- ### **Applications** #### **Chemical Processing** - Pump shafts and impellers - Valve stems and trim components - Mixer shafts and agitators - Fasteners and stud bolts - Reactor internals and accessories #### **Pharmaceutical Industry** - Processing equipment components - Tank fittings and accessories - Material handling parts - Sanitary processing components #### **Food Processing** - Equipment for acid food processing - Vinegar and pickle production equipment - Food acid handling components #### **Industrial Applications** - Heat exchanger components - Evaporator parts - Distillation column internals - Scrubber system components --- ### **Fabrication Characteristics** #### **Machining** - **Machinability:** 40-50% of B1112 (using standard ratings) - **Speed:** Moderate to high speeds with positive rake tools - **Feed:** Moderate feeds with good chip breaking - **Coolant:** Recommended for optimal tool life #### **Welding** - **Methods:** GTAW, GMAW, SMAW - **Filler Metal:** Alloy 20 or ENiCrFe-2/3 - **Precautions:** Low heat input, avoid contamination #### **Heat Treatment** - **Solution Annealing:** 925-1010°C (1700-1850°F) + rapid cool - **Stress Relieving:** Generally not required - **Annealing Atmosphere:** Bright annealing recommended --- ### **Corrosion Resistance** #### **Chemical Resistance** - **Excellent:** Sulfuric acid in all concentrations up to 95°C - **Good:** Phosphoric, nitric, and organic acids - **Resistant:** Chloride stress corrosion cracking - **Limited:** Hydrochloric acid and chlorides above 100°C #### **Special Features** - Copper content enhances sulfuric acid resistance - Niobium stabilization prevents intergranular corrosion - Balanced composition for wide pH range coverage --- ### **Quality Assurance** #### **Testing & Certification** - Chemical analysis certification - Mechanical testing reports - Corrosion test certificates available - Non-destructive testing upon request - Full traceability maintained #### **Quality Standards** - Mill test certificates to EN 10204 3.1/3.2 - Ultrasonic testing per ASTM A388 - Surface inspection per applicable standards --- ### **Packaging & Handling** - Individual protection against mechanical damage - Moisture-resistant wrapping - Proper identification and tagging - Special packaging for polished surfaces --- ### **Conclusion** Alloy 20/Carpenter 20Cb-3® Rod offers an exceptional combination of corrosion resistance and mechanical properties, making it the material of choice for critical components in aggressive chemical environments. Its superior performance in sulfuric acid applications, combined with excellent fabrication characteristics, ensures reliable service life and cost-effective operation in demanding industrial applications. The rod form provides manufacturers with versatile raw material for producing high-performance components that withstand the most challenging corrosive conditions. --- *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 and performance data.*

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 2665 gallon liquid totes Special package is available on request.