ASTM B474 UNS N08020 EFW Nickel Alloy Pipe

ASTM B474 is a standard specification for Electric-Fusion-Welded (EFW) Nickel-Chromium-Iron Alloy (UNS N08020) Pipe. UNS N08020 is commonly referred to as Alloy 20 and is known for its excellent resistance to acid attack, particularly sulfuric acid. This alloy contains nickel, chromium, and iron, with additional elements like copper and molybdenum to enhance its corrosion resistance properties.

Key Features of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:

- Corrosion Resistance: Excellent resistance to pitting and crevice corrosion in chemicals containing chlorides and sulfuric acid.

- Weldability: Good welding characteristics, suitable for electric-fusion welding.

- Mechanical Properties: High strength and good ductility.

- Applications: Used in industries such as chemical processing, petrochemical, 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 the fusion of the alloy material using an electric current. The process ensures a high-quality weld with consistent properties throughout the length of the pipe.

Standards and Testing of ASTM B474 UNS N08020 EFW Nickel Alloy Pipe:

Pipes manufactured under ASTM B474 must meet stringent quality control standards, including:

Tensile testing

Hardness testing

Chemical composition analysis

Hydrostatic testing

Non-destructive examination

These tests ensure that the pipes meet the required mechanical and corrosion resistance properties for their intended applications.