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, often referred to as Alloy 20, is particularly valued for its exceptional resistance to corrosion, especially in environments containing sulfuric acid and chlorides. Its composition includes nickel, chromium, and iron, with added elements like 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 well in both pitting and crevice corrosion scenarios, making it ideal for use in aggressive chemical environments. The material also exhibits excellent weldability, allowing for efficient and reliable electric-fusion welding processes. In terms of mechanical properties, it offers high strength combined with good ductility, ensuring it can withstand demanding industrial applications.
This type of pipe is widely used across various industries, including chemical processing, petrochemical, food and beverage, and pharmaceuticals. Its versatility makes it suitable for a range of applications such as storage tanks, mixing vessels, heat exchangers, process piping, pickling equipment, and other critical components where corrosion resistance is essential.
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%
In addition, trace amounts of carbon, manganese, silicon, phosphorus, sulfur, and columbium are also present, contributing to the alloy's overall stability and performance.
The manufacturing process of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe involves electric-fusion welding, which ensures strong, uniform, and high-quality welds throughout the length of the pipe. This method provides consistent mechanical and structural properties, making the final product highly reliable for industrial use.
To ensure quality and compliance, all pipes manufactured under ASTM B474 must undergo rigorous testing, including tensile testing, hardness testing, chemical composition analysis, hydrostatic testing, and non-destructive examination. These tests confirm that the pipes meet the required standards for mechanical strength, corrosion resistance, and dimensional accuracy.
Here is a summary of the 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'' to 48'' |
| **Thickness** | SCH5 to SCHXXS |
| **End Type** | Beveled End, Plain End |
| **Length** | Customized according to customer requirements |
| **Packing** | Export-standard packaging or as per customer request |
Whether you're looking for high-performance piping solutions in corrosive environments or need materials that offer long-term reliability, ASTM B474 UNS N08020 EFW Nickel Alloy Pipe is an excellent choice. Its combination of strength, corrosion resistance, and ease of fabrication makes it a preferred material in many industrial sectors.
This series includes high-performance models such as SH1000, SH2000, SH3000, etc., which customers can choose according to their different needs.
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