CRA Clad Pipe and Lined Pipe

Product: CRA Clad and Lined Steel Pipe

CRA refers to corrosion-resistant alloy. The CRA Clad and Lined Steel Pipe is composed of conventional carbon steel or low alloy steel pipes and a corrosion-resistant alloy layer. The CRA layer is metallurgically cladding to the internal or external surface of the steel pipe. Carbon steel or low-alloy steel pipe is called lining steel.

Inner CRA layer (0.25~6.0mm) normally such as Stainless steel, Duplex, Nickel alloy, Titanium, Hastelloy, Monel, etc. which are suitable for high corrosion environment.

Composition and Structure

CRA Clad Pipe consists of two main components:
Base Material: A conventional carbon steel or low alloy steel pipe, also called backing steel.
CRA Layer: A corrosion-resistant alloy layer metallurgically bonded to the internal (and sometimes external) surface of the steel pipe.

Clad and lined pipes are specialized types of pipes designed to enhance corrosion resistance and improve performance in various applications.

Clad Pipes:

Definition: Clad pipes are made by bonding a layer of corrosion-resistant material (such as stainless steel) to a carbon steel pipe. This combination provides the strength of carbon steel with the corrosion resistance of the outer layer.
Applications: Commonly used in industries like oil and gas, chemical processing, and power generation, where exposure to corrosive environments is a concern.

Lined Pipes:

Definition: Lined pipes have a protective lining (often made of materials like PTFE, rubber, or other polymers) applied to the inner surface of the pipe. This lining acts as a barrier against corrosive substances.
Applications: Frequently used in applications involving the transport of aggressive chemicals, slurries, or other materials that could damage the pipe’s interior.

Specification of  CRA Cladding Pipe
Bare Pipe	Seamless pipes and welded pipes
Standard of Bare Pipe	API5L，ASTMA106，ASTMA333 ，ASTMA335, etc
CRA Material	stainless steel and non-ferrous alloys: SS 304, SS 316, SS 317, duplex, alloy 254, SMO 904, Incoloy alloy 825, Inconel alloy 625, Hastelloy C-276, Inconel alloy 59, alloy 31, AL6NX, alloy 20, Monel 400, titanium, aluminum and some copper alloys
Standard of CRA Material	ASTMA240，A263，A264 ，A265，B898，B424，B443，B619，B622，B675，B265，B551
Standard of CRA Cladding Pipe	API5LD

Material Selection and Standard Specification

Base materials of the CRA clad steel pipes include seamless or welded line pipes of API, ASTM, etc.

The CRA cladding or lining material covers an extensive range of stainless steels and nonferrous alloys. SS 304, SS 316, SS 317, Duplex, Alloy 254 SMO 904, Incoloy alloy 825, Inconel alloy 625, Hastelloy C-276, Inconel alloy 59, Alloy 31, AL6NX, Alloy 20, Monel alloy 400, Titanium, Zirconium, and some copper alloys.

Generally, CRA-clad pipes shall be manufactured in accordance with API 5LD. The base material (steel pipe) conforms to API 5L, ASTM A106, ASTM A333, ASTM A335, etc. The cladding material shall conform to ASTM A240, A263, A264, A265, B898, B424, B443, B619, B622, B675, B265, B551.

Advantages

• Excellent corrosion resistance in harsh environments, including high temperature, high pressure, and corrosive fluids.
• Combines the strength and durability of carbon steel with the corrosion resistance of CRA materials.
• Cost-effective for large-diameter heavy pipelines, as the thin CRA layer provides enhanced properties while minimizing expenses.

Applications

CRA Clad Pipes are widely used in various industries:

oil and gas industry,

Shipbuilding,

chemical plants,

power plants, and so on.

That’s because the CRA layer not only enhances the corrosion resistance of the pipeline but also reduces the cost to a minimum.