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ASTM B474 is a well-established standard specification that outlines the requirements for Electric-Fusion-Welded (EFW) Nickel-Chromium-Iron Alloy (UNS N08020) pipes. Commonly known as Alloy 20, this material is renowned for its exceptional corrosion resistance, particularly against sulfuric acid. The alloy is composed primarily of nickel, chromium, and iron, with additional elements such as copper and molybdenum added to further enhance its corrosion-resistant properties.
**Key Features of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:**
Alloy 20 exhibits superior resistance to pitting and crevice corrosion, making it ideal for use in environments where exposure to aggressive chemicals containing chlorides or sulfuric acid is expected. Its excellent weldability allows for reliable electric-fusion welding, ensuring consistent quality across the entire length of the pipe. Additionally, the alloy boasts high strength and good ductility, providing structural integrity while maintaining flexibility. Industries such as chemical processing, petrochemicals, food and beverage, and pharmaceuticals frequently utilize these pipes due to their versatility and durability.
**Composition of Alloy 20 (UNS N08020):**
This alloy is meticulously crafted with precise percentages of key elements:
- Nickel (Ni): 32-38%
- Chromium (Cr): 19-21%
- Iron (Fe): Balance
- Molybdenum (Mo): 2-3%
- Copper (Cu): 3-4%
- Other elements: Trace amounts of carbon, manganese, silicon, phosphorus, sulfur, and columbium.
**Typical Applications of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:**
Alloy 20 pipes find application in various critical areas:
- Storage tanks for corrosive materials.
- Mixing tanks used in industrial processes.
- Heat exchangers where temperature regulation is crucial.
- Process piping systems in demanding environments.
- Pickling equipment within chemical plants.
- Equipment in the pharmaceutical industry requiring non-reactive materials.
**Manufacturing Process of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:**
The EFW process employs an electric current to fuse the alloy material, resulting in a high-quality weld with uniform properties throughout the pipe. This method ensures that each pipe meets strict quality benchmarks, delivering reliability and performance consistency.
**Standards and Testing of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:**
Pipes manufactured under ASTM B474 undergo rigorous quality control procedures to guarantee compliance with industry standards. These include tensile testing, hardness testing, chemical composition analysis, hydrostatic testing, and non-destructive examinations. Such comprehensive testing ensures the pipes possess the necessary mechanical and corrosion-resistant qualities for their intended uses.
**Specifications and Details:**
| Specification | Description |
|---------------|-------------|
| Standard | ASME SB474 / ASTM B474 |
| Material Grade | UNS N02200, UNS N02201, UNS N04400, UNS N06002, UNS N06022, UNS N08825, UNS N10276, UNS N10665, UNS N10675, UNS N06030, UNS N06200, UNS N06230, UNS N06600, UNS N06601, UNS N06625, UNS N06985, UNS N08020 |
| Size | 1/2†~ 48†|
| Thickness | SCH5 ~ SCHXXS |
| Ends | Beveled End, Plain End |
| Length | As per customer requirements |
| Packing | Export standard packaging or customized as per customer needs |
In conclusion, the ASTM B474 standard sets a high benchmark for EFW Nickel-Chromium-Iron Alloy pipes, particularly those made from UNS N08020 (Alloy 20). Its robust composition and versatile applications make it indispensable in industries where resistance to corrosion and mechanical strength are paramount. Whether you're building storage tanks, designing heat exchangers, or constructing chemical processing facilities, Alloy 20 pipes offer unparalleled reliability and performance.