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ASTM B474 serves as a well-defined specification for Electric-Fusion-Welded (EFW) Nickel-Chromium-Iron Alloy (UNS N08020) Pipe. Commonly known as Alloy 20, this material is renowned for its exceptional resistance to acid corrosion, particularly when it comes to sulfuric acid. The alloy consists primarily of nickel, chromium, and iron, with additional elements like copper and molybdenum added to enhance its corrosion-resistant properties.
**Key Features of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:**
- **Corrosion Resistance:** Outstanding resistance against pitting and crevice corrosion, especially in environments with chlorides and sulfuric acid.
- **Weldability:** Excellent welding characteristics, making it ideal for electric-fusion welding processes.
- **Mechanical Properties:** High strength combined with good ductility ensures reliability under various conditions.
- **Applications:** Widely used across industries such as chemical processing, petrochemicals, food and beverage, and pharmaceuticals.
**Composition of Alloy 20 (UNS N08020):**
- 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:**
- Storage tanks
- Mixing tanks
- Heat exchangers
- Process piping
- Pickling equipment
- Chemical and pharmaceutical equipment
**Manufacturing Process of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:**
The EFW process involves joining the alloy materials through electric current fusion. This method ensures a high-quality weld with consistent properties along the entire length of the pipe, providing durability and reliability.
**Standards and Testing of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:**
Pipes manufactured under ASTM B474 must adhere to strict quality control standards, including:
- Tensile testing
- Hardness testing
- Chemical composition analysis
- Hydrostatic testing
- Non-destructive examination
These rigorous tests guarantee that the pipes meet the necessary mechanical and corrosion-resistant properties required for their specific applications.
**Specifications and Details:**
| ASME SB474 / ASTM B474 | Standard Specification for Electric Fusion Welded Nickel and Nickel Alloy Pipe |
|-------------------------|--------------------------------------------------------------------------------|
| Material Grades | 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 |
| Ends | Beveled End, Plain End |
| Length | As per customer specifications |
| Packing | Export standard packing or as per customer requirements |
This comprehensive approach ensures that the ASTM B474 UNS N08020 EFW Nickel Alloy Pipe meets industry standards while offering superior performance in corrosive environments. Whether for storage, processing, or equipment manufacturing, these pipes provide reliable solutions across multiple sectors.