Alloy 20Cb3 Round Bars Manufacturer, Stockist and Exporter
Alloy 20Cb3 Round Bars are premium nickel-iron-chromium alloys engineered for exceptional corrosion resistance. They are widely used in chemical and petrochemical industries where resistance to oxidizing and reducing acids is crucial. These bars provide a combination of high strength and excellent fabricability. The addition of niobium (Cb3) enhances resistance to intergranular corrosion. Alloy 20Cb3 is particularly resistant to sulfuric acid, making it a preferred choice in chemical process equipment. Their durability ensures long-term performance in harsh environments.
These round bars are extensively used in the manufacture of pumps, valves, heat exchangers, and piping systems. The alloy is ideal for use in equipment exposed to aggressive chemical environments. Alloy 20Cb3 is also employed in the production of reactor vessels, storage tanks, and chemical handling equipment. Industries like pharmaceuticals, fertilizer production, and oil & gas benefit from its corrosion-resistant properties. The alloy’s excellent weldability and machinability make it easier for fabricators to shape components. Additionally, it offers superior performance in both high- and low-temperature conditions.
Alloy 20Cb3 Round Bars offer multiple advantages such as excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. The niobium addition prevents carbide precipitation during welding, improving intergranular corrosion resistance. They have high tensile and yield strengths, ensuring reliable mechanical performance. These bars maintain their structural integrity in a wide range of chemical environments. They are also easy to machine and fabricate into complex shapes. Furthermore, the alloy’s surface finish remains stable over time, reducing maintenance costs.
Worldwide Alloy 20Cb3 Round Bars Manufacturer, Stockist and Exporter
The manufacturing process of Alloy 20Cb3 Round Bars involves precise melting, casting, and hot-rolling operations. Vacuum induction melting ensures a homogeneous composition, while controlled hot working refines the microstructure. After rolling, bars undergo solution annealing to dissolve any carbides and achieve maximum corrosion resistance. The final product is then inspected for dimensional accuracy and surface defects. Advanced quality checks ensure compliance with international standards. This meticulous process guarantees a consistent product suitable for critical applications.
Alloy 20Cb3 Round Bars are highly resistant to both oxidizing and reducing acids. The addition of niobium enhances resistance to intergranular attack, especially after welding. The alloy performs well in environments containing sulfuric, nitric, and hydrochloric acids. Its resistance to pitting and crevice corrosion makes it suitable for chloride-containing solutions. Alloy 20Cb3 maintains its corrosion resistance even at elevated temperatures. These properties make it ideal for chemical process industries where reliability is essential.
Alloy 20Cb3 Round Bars exhibit superior mechanical properties, including high tensile strength and hardness. They typically have a tensile strength ranging from 750–900 MPa and a yield strength of 310–550 MPa, depending on heat treatment. The elongation at break usually ranges between 30–45%, indicating excellent ductility. These bars maintain mechanical stability even at elevated temperatures. They can withstand cyclic loading and resist stress corrosion cracking. The combination of strength and corrosion resistance ensures long-term durability in industrial applications.
Fabrication and machining of Alloy 20Cb3 Round Bars are relatively straightforward due to their moderate hardness and toughness. Conventional machining processes such as turning, drilling, and milling can be used effectively. The alloy’s excellent weldability allows for secure joining using standard welding techniques. Post-weld annealing is recommended to maintain optimal corrosion resistance. Its work-hardening rate is moderate, reducing the risk of tool wear during machining. Special cutting tools and lubricants may be employed for precision work. These properties make Alloy 20Cb3 ideal for custom components requiring tight tolerances.
Alloy 20Cb3 Round Bars Specifications
| Property | Typical Specification / Notes |
|---|---|
| Grade | Alloy 20Cb3 (also referenced as Alloy 20 with columbium/niobium stabilization) |
| UNS / Other Designation | Commonly derived from Alloy 20 family (verify UNS with supplier) |
| Condition | Annealed (standard). Bars may also be supplied cold-drawn or bright-turned. |
| Density | ≈ 8.0 g/cm³ (typical) |
| Melting range | Approximately 1350–1450 °C (typical for nickel-iron-chrome alloys) |
| Chemical composition (typical ranges) |
Ni ~30–36% • Cr ~19–22% • Fe balance • Cu ~3–4% • Mo ~2–3% • C <0.03% • Nb (Cb) small addition (stabilizer) ~0.3–1.0% (typical). Note: exact ranges depend on specification and mill; always use supplier MTC for design. |
| Mechanical properties (annealed, typical) |
Tensile strength: ~550–850 MPa (varies by heat and finish) Yield strength (0.2% offset): ~200–450 MPa Elongation (in 50 mm): ~30–40% (typical) |
| Hardness (typical) | Rockwell B: ~70–95 (annealed) — depends on processing |
| Modulus of elasticity | ≈ 190–210 GPa (typical for Ni-Fe-Cr alloys) |
| Thermal conductivity | Moderate; refer to datasheet for temperature-dependent values |
| Electrical resistivity | Higher than carbon steels; use supplier datasheet for design values |
| Typical tolerances / finish | Standard round-bar tolerances (±0.1 mm to ±0.5 mm depending on size & finish). Bright/turned finish available on request. |
| Standard lengths | Typically 1–6 m (check with mill/supplier). Custom lengths and cut-to-length services commonly available. |
| Available diameters | Common: 6 mm → 300 mm (depends on mill capability). Metric and imperial sizes available. |
| Corrosion resistance | Good resistance to reducing acids and chloride-bearing environments; improved over standard austenitic stainless in certain media due to copper & molybdenum additions. Confirm for specific environment. |
| Weldability | Good weldability using appropriate filler metals and procedures; stabilized with Nb (Cb) to reduce sensitization. Pre/post-weld treatment depends on application. |
| Heat treatment | Annealing recommended after heavy cold work. Follow supplier/ASME/ASTM guidance for temperatures and cycles. |
| Typical applications | Chemical process equipment, pharmaceuticals, pulp & paper, corrosion-resistant shafts/fasteners where sulfuric/phosphoric acids or chloride-bearing media are present. |
| Quality & standards | Supply to customer standards (e.g., EN / ASTM / ASME) on request — verify exact spec number with supplier. Mill Test Certificate (MTC) provided on request. |
| Notes / Remarks | Always confirm specific composition, mechanical limits and tolerances with the supplier's certificate (MTC) before design or purchase. |
Chemical Composition
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 32.0 – 38.0 |
| Chromium (Cr) | 19.0 – 21.0 |
| Iron (Fe) | Balance |
| Copper (Cu) | 3.0 – 4.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Niobium (Cb/Nb) | 8 × C min – 1.0 max |
| Carbon (C) | 0.07 max |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 1.0 max |
| Sulfur (S) | 0.035 max |
| Phosphorus (P) | 0.045 max |
Mechanical Properties
| Property | Typical Value | Condition |
|---|---|---|
| Tensile Strength | 550 – 750 MPa | Annealed |
| Yield Strength (0.2% Offset) | 240 – 350 MPa | Annealed |
| Elongation | 30 – 40% | Annealed |
| Hardness | Rockwell B 70 – 95 | Annealed |
| Modulus of Elasticity | 195 – 205 GPa | Typical |
| Melting Range | 1350 – 1450 °C | Typical |
Dimensions
| Diameter (mm) | Diameter (inch) | Standard Length (m) | Finish |
|---|---|---|---|
| 6 | 0.236 | 1 – 6 | Bright / Cold Drawn |
| 8 | 0.315 | 1 – 6 | Bright / Cold Drawn |
| 10 | 0.394 | 1 – 6 | Bright / Cold Drawn |
| 12 | 0.472 | 1 – 6 | Bright / Cold Drawn |
| 16 | 0.630 | 1 – 6 | Hot Rolled / Cold Drawn |
| 20 | 0.787 | 1 – 6 | Hot Rolled |
| 25 | 0.984 | 1 – 6 | Hot Rolled |
| 32 | 1.260 | 1 – 6 | Hot Rolled |
| 40 | 1.575 | 1 – 6 | Hot Rolled |
| 50 | 1.969 | 1 – 6 | Hot Rolled |
| 63 | 2.480 | 1 – 6 | Hot Rolled |
| 75 | 2.953 | 1 – 6 | Hot Rolled |
| 100 | 3.937 | 1 – 6 | Hot Rolled / Forged |
| 120 | 4.724 | 1 – 6 | Forged |
| 150 | 5.906 | 1 – 6 | Forged |
| 200 | 7.874 | 1 – 6 | Forged |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | N08020 |
| Werkstoff Nr. | 2.4660 |
| EN | Alloy 20 / NiCr20CuMo |
| ASTM | Alloy 20 (typically supplied under ASTM B473 for bars) |
| ASME | SB-473 |
| Trade Names | Carpenter 20, Alloy 20Cb-3®, 20Cb3 |
Weight Chart (Approx.)
| Diameter (mm) | Weight (kg/m) |
|---|---|
| 6 | 0.22 |
| 8 | 0.39 |
| 10 | 0.62 |
| 12 | 0.89 |
| 16 | 1.58 |
| 18 | 2.00 |
| 20 | 2.47 |
| 22 | 2.98 |
| 25 | 3.85 |
| 28 | 4.83 |
| 32 | 6.31 |
| 36 | 7.99 |
| 40 | 9.87 |
| 45 | 12.48 |
| 50 | 15.41 |
| 56 | 19.33 |
| 63 | 25.00 |
| 70 | 30.80 |
| 75 | 35.28 |
| 80 | 39.50 |
| 90 | 50.00 |
| 100 | 61.60 |
| 120 | 88.70 |
| 150 | 138.30 |
| 200 | 246.40 |
The applications of our Alloy 20Cb3 round bars include oil & gas projects, chemical processing plants, desalination systems, shipbuilding, aerospace, automotive, and heavy engineering. With superior resistance to oxidation and stress corrosion cracking, our bars perform reliably in extreme environments. Whether it is for large-scale infrastructure projects in Mumbai or precision engineering in Germany and the USA, Shakti Forge India remains the first choice for industries that demand excellence.
As one of the most reliable Alloy 20Cb3 Round Bars Manufacturer, Stockist and Exporter, Shakti Forge India continues to expand its presence in domestic and international markets. Our focus on quality, timely delivery, and customer satisfaction makes us a preferred partner for leading industries across the globe. For bulk requirements or customized solutions, Shakti Forge India ensures the highest level of product integrity and service excellence.
Frequently Asked Questions (FAQs)
Q:1. What is Alloy 20Cb3 Round Bar?
- Alloy 20Cb3 Round Bar is a highly corrosion-resistant nickel-iron-chromium alloy stabilized with niobium (columbium). It is designed to provide excellent resistance to sulfuric acid, chloride stress corrosion cracking, and other aggressive environments in chemical processing industries.
Q:2. What is the chemical composition of Alloy 20Cb3?
- Alloy 20Cb3 contains Nickel (32–38%), Chromium (19–21%), Copper (3–4%), Molybdenum (2–3%), Niobium, and low levels of carbon, manganese, silicon, sulfur, and phosphorus, with Iron as the balance element.
Q:3. What are the key mechanical properties?
- Typical mechanical properties include tensile strength of 550–750 MPa, yield strength of 240–350 MPa, elongation of 30–40%, and Rockwell B hardness between 70–95 in the annealed condition.
Q:4. What industries commonly use Alloy 20Cb3 Round Bars?
- These bars are widely used in chemical processing, petrochemicals, pharmaceuticals, food processing, pickling equipment, and applications that require resistance to strong acids such as sulfuric, phosphoric, and nitric acids.
Q:5. What standards apply to Alloy 20Cb3 Round Bars?
- The grade typically corresponds to UNS N08020 and Werkstoff 2.4660, and bars are supplied under ASTM B473 or ASME SB473 specifications.
Q:6. What are the available sizes for Alloy 20Cb3 Round Bars?
- Standard diameters range from 6 mm to 200 mm, supplied in cold-drawn, hot-rolled, or forged conditions depending on the required diameter and application.
Cities we have supplied our products to
Mumbai, Delhi, Bengaluru(Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Narmada, Ankleshwar, Navsari, Valsad, Rajpipla, Veraval,Kovvur, Andra Pradesh,Karwar, Karnataka,Kosamba, Gujarat, Vishakapatnam, Shahad, Pondicherry, Kakkinada, Pradesh, Nagda, Madhya Pradesh,Harihar, Karnataka, Tuticorin, Tamilnadu, Trivandrum, KeralaKurnool, Rourkela, Hindupur, Orissa, Renukoot, Uttar Morbi, Kerala ,Himachal, Dehradun, Visakhapatnam ,Jamnagar, Kozhikode, Ludhiana,Latur, Nanded, Vijaywada, Alwar, Bareilly, Bikaner, Andheri, Marol, Taloja, Turbhe, TTC (Thane-Belapur), Pimpri-Chinchwad, Chakan, Talegaon, Ranjangaon, Jejuri, Baramati, Satpur, Ambad, Sinnar, Igatpuri, Shendra, Waluj, Chikalthana, Paithan, Hingna, Butibori, Kalmeshwar, Umred, Shiroli, Kagal, Gokul Shirgaon, Akkalkot, Chincholi, Lote-Parshuram, Dombivli, Ambernath, Mahad, Roha, Palghar, Tarapur (Boisar)
Cities we have supplied our products to
South Korea, Africa, Sri Lanka, Syria, Taiwan, Tanzania, Tajikistan, Thailand, Turkey, Turkmenistan, Ukraine, United Kingdom, Arab Emirates (UAE), Uzbekistan, Vietnam, Yemen, France, Germany, Greece, Oman, Colombia, Portugal, Japan, Lithuania, Macau, Mongolia, Qatar, Ireland, Malaysia, Bangladesh, Russia, Iran, Jordan, Singapore, Bulgaria, Poland, Denmark, Nigeria, Gambia, Indonesia, Finland, Argentina, Chile, Spain, Peru, Kuwait, India, Saudi Arabia, Slovakia, Slovenia, Sweden, Switzerland, Bahrain, the Netherlands, United Kingdom, Mexico, Bulgaria, Spain, France, Germany, Colombia, Brazil, Saudi Arabia, Iraq, Iran, Sudan, Libya, Tanzania, Nigeria, New Zealand, Paris, Switzerland
Applications of Alloy 20Cb3 Round Bars
- Oil & Gas Industry – pipelines, offshore rigs, valves, and fittings
- Chemical Processing Plants – heat exchangers, reactors, and storage vessels
- Marine & Shipbuilding – propeller shafts, seawater systems, and pumps
- Aerospace – jet engines, turbine blades, and structural components
- Power Generation – nuclear plants, boilers, and steam generators
- Automotive – exhaust systems, sensors, and performance parts
- Pharmaceutical & Food Industry – equipment requiring hygiene and corrosion resistance
- Construction & Infrastructure – high-strength fasteners, joints, and supports