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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 or Alloy 20. This alloy is particularly valued for its outstanding resistance to corrosion, especially in environments containing sulfuric acid and chlorides. It is composed primarily of nickel, chromium, and iron, with additions of copper and molybdenum to further enhance its durability and performance in harsh chemical conditions.
One of the key advantages of ASTM B474 UNS N08020 EFW pipe is its excellent corrosion resistance, which makes it ideal for use in aggressive industrial settings. The alloy also exhibits good weldability, making it suitable for electric-fusion welding techniques that ensure strong and reliable joints. In addition to its corrosion resistance, Alloy 20 offers high mechanical strength and good ductility, allowing it to perform well under various stress conditions.
This type of pipe is commonly used across several industries, including chemical processing, petrochemical, food and beverage, and pharmaceuticals. Its versatility and reliability make it a preferred choice for applications such as storage tanks, mixing vessels, heat exchangers, process piping, and pickling equipment.
The composition of Alloy 20 includes:
- Nickel (Ni): 32–38%
- Chromium (Cr): 19–21%
- Iron (Fe): Balance
- Molybdenum (Mo): 2–3%
- Copper (Cu): 3–4%
- Trace elements like carbon, manganese, silicon, phosphorus, sulfur, and columbium
These elements work together to provide the alloy with superior resistance to pitting, crevice corrosion, and general degradation in acidic environments.
The manufacturing process of ASTM B474 UNS N08020 EFW pipe involves electric-fusion welding, which ensures a uniform and high-quality weld throughout the pipe’s length. This method provides consistent mechanical properties and structural integrity, making it suitable for critical applications where reliability is essential.
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 verify that the pipes meet all required mechanical and corrosion resistance standards for their intended use.
Here are some typical specifications for ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:
| 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 customer requirement |
| **Packing** | Export standard packing or customized as needed |
Whether you're looking for reliable piping solutions for chemical processing or other demanding environments, ASTM B474 UNS N08020 EFW pipe is a trusted choice that delivers both performance and long-term value.