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B729 UNS N08020 Duplex 2205 Tube
Introduction
The B729 UNS N08020 Duplex 2205 Tube is a highly versatile and durable tube that finds applications in various industries. Known for its excellent corrosion resistance and mechanical properties, this tube is widely used in demanding environments. In this article, we will delve into the material, specifications, key features, chemical composition, mechanical properties, physical properties, process performance, steel grade, application, and possible alternative grades of the B729 UNS N08020 Duplex 2205 Tube.
Material and Specification
The B729 UNS N08020 Duplex 2205 Tube is made from a high-grade steel alloy and conforms to the ASTM B729 and UNS N08020 standards. It is available in different sizes, thicknesses, and lengths to suit various applications.
Key Features
Excellent corrosion resistance, making it suitable for highly corrosive environments
High strength and toughness, ideal for applications subjected to heavy loads and extreme conditions
Good weldability, allowing for easy fabrication and installation
Good formability, enabling the tube to be shaped or bent according to requirements
Resistant to pitting, crevice corrosion, and stress corrosion cracking
Chemical Composition
| Element | Percentage(%) |
| Nickel (Ni) | 32.0 - 38.0 |
| Chromium (Cr) | 19.0 - 21.0 |
| Molybdenum (Mo) | 2.00 - 3.00 |
| Copper (Cu) | 3.00 - 4.00 |
| Iron (Fe) | Balance |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Carbon (C) | ≤ 0.07 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.035 |
| Nitrogen (N) | ≤ 0.10 |
Mechanical Properties
| Property | Value |
| Tensile Strength (MPa) | ≥ 620 |
| Yield Strength (MPa) | ≥ 450 |
| Elongation (%) | ≥ 30 |
| Hardness (HRC) | ≤ 32 |
| Impact Toughness (J) | ≥ 100 (at -46°C / -50°F) |
Physical Properties
| Property | Value |
| Density | 7.80 g/cm³ |
| Melting Range | 1420 - 1465°C (2588 - 2669°F) |
| Thermal Conductivity | 12.0 W/(m·K) (at 100°C / 212°F) |
| Specific Heat Capacity | 460 J/(kg·K) (at 20°C / 68°F) |
| Coefficient of Expansion | 13.7 µm/m·K (at 20 - 100°C / 68 - 212°F) |
Process Performance
The B729 UNS N08020 Duplex 2205 Tube demonstrates excellent process performance. It can be easily formed, fabricated, and welded using common methods such as hot working, cold working, and machining. The tube also exhibits good corrosion resistance during pickling, making it suitable for various industrial processes.
Steel Grade
The steel grade designation for the B729 UNS N08020 Duplex 2205 Tube is B729.
Application
The B729 UNS N08020 Duplex 2205 Tube is commonly used in industries such as chemical processing, petrochemicals, pharmaceuticals, oil and gas, pulp and paper, and offshore platforms. It is employed in heat exchangers, condensers, pipelines, pressure vessels, and other equipment where resistance to corrosion, high strength, and reliability are paramount.
Possible Alternative Grades
While the B729 UNS N08020 Duplex 2205 Tube offers excellent properties, there may be instances where alternative grades are required for specific applications. Some possible alternative grades include B729 UNS N08020, B729 UNS N08026, and B729 UNS N08024, among others. The selection of an alternative grade should be determined based on the specific requirements of the application.
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