GB/T 21832 Welded Austenitic-Ferritic Duplex Stainless Steel Tubes And Pipes For Heat Exchanger
Material and Specification
The GB/T 21832 standard provides the requirements for welded austenitic-ferritic duplex stainless steel tubes and pipes specifically designed for heat exchanger applications. This standard establishes the material and specifications that need to be met to ensure the quality and reliability of the products.
Key Features
The welded austenitic-ferritic duplex stainless steel tubes and pipes manufactured according to GB/T 21832 exhibit several key features that make them suitable for heat exchangers:
- High Strength: Duplex stainless steel possesses excellent mechanical properties, combining the advantages of both austenitic and ferritic stainless steels.
- Corrosion Resistance: These tubes and pipes demonstrate superior resistance to various corrosive environments, such as chloride-induced stress corrosion cracking.
- Good Weldability: The material exhibits good weldability, allowing for easy fabrication and joining of components.
- High Thermal Conductivity: Duplex stainless steel offers excellent thermal conductivity, facilitating efficient heat transfer within the heat exchanger.
- Cost-Effectiveness: The combination of desirable properties and competitive pricing makes these tubes and pipes a cost-effective choice for heat exchanger applications.
Chemical Composition
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N |
| Weight % | 0.03-0.08 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.020 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| Minimum Value | ≥ 620 | ≥ 450 | ≥ 25 | ≤ 290 |
Steel Grade
The GB/T 21832 standard covers various steel grades suitable for heat exchanger application. These grades include:
These steel grades exhibit similar mechanical properties and chemical composition, ensuring high-performance under demanding conditions.
Application
Welded Austenitic-Ferritic Duplex Stainless Steel Tubes and Pipes, as per GB/T 21832, are predominantly used in heat exchangers. These devices are widely employed in various industries, including chemical processing, petroleum refining, power generation, and desalination plants. The superior corrosion resistance and thermal conductivity of these tubes and pipes make them a reliable choice for efficient heat transfer between different fluids.
Possible Alternative Grades
While the steel grades mentioned earlier are commonly used, there are also alternative grades that can be considered for specific applications. Some of the possible alternative grades to GB/T 21832 include:
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