ASTM B474 is a widely recognized standard that specifies the requirements for Electric-Fusion-Welded (EFW) pipes made from Nickel-Chromium-Iron Alloy, commonly known as UNS N08020. This alloy is also referred to as Alloy 20 and is highly valued for its exceptional resistance to corrosion, especially in environments containing sulfuric acid. The composition includes nickel, chromium, and iron, with added elements such as copper and molybdenum that significantly enhance its durability and performance in harsh chemical conditions.
One of the key advantages of ASTM B474 UNS N08020 EFW nickel alloy pipe is its outstanding corrosion resistance. It performs exceptionally well in applications involving chlorides and sulfuric acid, offering protection against pitting and crevice corrosion. Additionally, it has good weldability, making it suitable for electric-fusion welding techniques. The mechanical properties of this alloy are also impressive, with high strength and good ductility, allowing it to withstand demanding industrial conditions.
This type of pipe is extensively used across various industries, including chemical processing, petrochemicals, food and beverage, and pharmaceuticals, where reliability and corrosion resistance are critical. Its versatility makes it ideal for a wide range of applications such as storage tanks, mixing vessels, heat exchangers, process piping, pickling equipment, and other specialized chemical and pharmaceutical systems.
The composition of Alloy 20 (UNS N08020) typically includes:
- Nickel (Ni): 32–38%
- Chromium (Cr): 19–21%
- Iron (Fe): Balance
- Molybdenum (Mo): 2–3%
- Copper (Cu): 3–4%
- Trace amounts of carbon, manganese, silicon, phosphorus, sulfur, and columbium.
The manufacturing process of ASTM B474 EFW nickel alloy pipes involves electric-fusion welding, which ensures strong, uniform, and high-quality welds throughout the pipe. This method provides consistent mechanical and metallurgical properties, making the final product reliable and durable.
To ensure quality and compliance, pipes manufactured under ASTM B474 undergo rigorous testing, including tensile testing, hardness testing, chemical composition analysis, hydrostatic testing, and non-destructive examination. These tests guarantee that the pipes meet the required standards for mechanical strength and corrosion resistance, ensuring their suitability for critical industrial applications.
Below is a summary of the specifications and details related to ASTM B474:
| ASME SB474 / ASTM B474 | Standard Specification for Electric Fusion Welded Nickel and Nickel Alloy Pipe |
|------------------------|-----------------------------------------------------------------------------|
| **Material Grade** | UNS N02200, UNS N02201, UNS N04400, UNS N06002, UNS N06022, UNS N08825, UNS N10276, UNS N10665, UNS N10675, UNS N08026, UNS N06030, UNS N06200, UNS N06230, UNS N06600, UNS N06601, UNS N06625, UNS N06985, UNS N08020 |
| **Size** | 1/2'' ~ 48'' |
| **Thickness** | SCH5 ~ SCHXXS |
| **End** | Beveled End, Plain End |
| **Length** | As per your requirement |
| **Packing** | Export Standard packing or as per your requirements |
Whether you're looking for high-performance piping solutions for chemical processing or other industrial applications, ASTM B474 UNS N08020 EFW nickel alloy pipe offers a reliable and long-lasting option. Its combination of corrosion resistance, strength, and ease of fabrication makes it an excellent choice for a variety of demanding environments.
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