To find certified nickel alloy 20 seamless tubes for industrial use, choose Zhejiang Xintongda Special Steel (XTD). We are a leading manufacturer in China and a worldwide supplier of ASTM B729 UNS N08020 tubes. We have 4 decades of experience and supply these tubes in accordance with international standards.
ASTM B729 Nickel Alloy 20 Seamless Tube Manufacturer in China
We at Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. (XTD) are an experienced manufacturer and supplier of Nickel Alloy 20 seamless tubes from China, serving demanding industries worldwide. These tubes, also known as Carpenter 20, are designed for use in extremely corrosive and chemically demanding environments. We manufacture these tubes in accordance with ASTM B729 standards, using an advanced seamless production method. The metal's high nickel, chromium, and molybdenum content reduces corrosion-related degradation and shields it against sulfuric acid corrosion, pitting, crevice corrosion, and stress corrosion cracking. Our nickel alloy 20 seamless tubes are commonly used in chemical plants, pharmaceutical manufacturing, food processing equipment, and the oil and gas industries. With an annual production capacity of 25,000 tons along with extensive global logistics capabilities, we ensure a consistent supply worldwide. All of our tubes undergo extensive testing and are certified to ISO 9001, PED, and ABS standards to ensure consistent quality and reliability.
Product Specifications
Standard ASTM B729
OD Range 6-457 mm
Thickness 1-65 mm
Length ≤ 22 m
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Technical Data
Technical Data
Manufacturing Process of Nickel Alloy 20 Tube
As an experienced Alloy 20 seamless tube manufacturer in China, we manufacture UNS N08020 tubes by heating high-purity billets, hot extruding for seamless formation, and cold drawing for precision. This is followed by heat treatment and annealing. This ensures resilience to corrosive conditions like strong acids, as well as a consistent microstructure. Visit this page for a more detailed description of our manufacturing processes.
Key Features of Alloy 20 Seamless Tube
The following are the 3 key features of ASTM B729 UNS N08020 tubes.
- Superior corrosion resistance: Nickel Alloy 20 seamless tube provides enhanced corrosion resistance due to its high content of nickel, chromium, molybdenum, and copper. This balanced composition shields the tube from acid attacks, pitting, and stress corrosion cracking. The seamless structure reduces weak points, ensuring durability in challenging chemical environments.
- Strong mechanical properties: ASTM B729 specifies mechanical property requirements, with a tensile strength of around 550 MPa, a yield strength of 240 MPa and an elongation of approximately 30%, depending on heat treatment condition. Provides exceptional toughness and fatigue resistance for high-pressure pipe systems, heat exchangers, and structural components subjected to cyclical loads.
- Ease of fabrication and welding: Nickel Alloy 20 seamless tube is easy to fabricate and weld due to its balanced nickel-chromium chemistry and low carbon content. The material bends, shapes, and welds effectively, without splitting or losing its corrosion resistance. This allows for faster, safer, and more reliable installation in chemical processing systems.
ASTM B729 UNS N08020 Alloy 20 Equivalent Grades
Nickel Alloy 20, also known as UNS N08020, is available in grades that are similar to global standards. This ensures consistent material performance in corrosive applications. Common equivalents include:
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Alloy 20 | N08020 | — | — | — | NiCr20CuMo | 2.4660 | — |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
Industries of Nickel Alloy 20 Seamless Tube
Nickel Alloy 20 seamless tube performs well in industries that experience aggressive corrosion from strong acids such as sulfuric acid. We serve the following 6 important industries:
Chemical Processing
Nickel Alloy 20 seamless tubing supports acid storage and handling. We use it in tanks, transfer piping, reactors and heat exchangers that run strong sulfuric acid streams at elevated temperatures. It also supports caustic wash systems and pickling lines.
Petrochemical and Refining
Our tubes are used in sulfuric acid plants, alkylation units and sour gas systems. This tube offers stable performance in high chloride streams and prevents stress corrosion cracking in piping, condensers, pumps and valves.
Power Generation
Our tubing is suitable for boiler feedwater heaters, condensers, and chemical dosing lines. Our tube retains strength under heat and pressure while resisting corrosion from acidic deposits inside the heat exchanger tubing.
Pharmaceuticals
Our tubes are used in pharma units for cleaning process lines and heating loops. The alloy supports acid wash streams in reactors and also meets hygiene needs for sterile transfer lines.
Marine
We supply tubes that are used for marine plants in seawater cooling systems, intake lines, brine heaters and heat exchangers. These tubes resist pitting and crevice attack in salt exposure and hold strength under flow and pressure.
Food Processing Equipment
We provide these tubes for heat exchangers, steam lines, and wash circuits. It supports hot cleaning fluids and prevents metal leaching in product contact areas.
Frequently asked Questions
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Where to find certified nickel alloy 20 seamless tubes for industrial use?
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What are the mechanical properties of Nickel Alloy 20 Seamless tube?The mechanical properties of Nickel Alloy 20 seamless tubes include a minimum tensile strength of 550 MPa, a yield strength of 240 MPa, and 30% elongation. These qualities ensure longevity in high-stress applications like heat exchangers and pumps. The values comply with ASTM B729 standards.