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Cladding can enhance a metal’s corrosion-resistant properties. The process involves the deposition of a corrosion-resistant alloy (CRA) layer over a base metal with weaker properties. The most common CRA is stainless steel. Along with its corrosion-resistant properties, stainless steel also offers the benefits of increased strength, temperature resistance, and cost-efficiency.
From pipeline safety to architectural improvement, stainless steel cladding provides benefits across a wide range of applications. In this article, we’ll examine the ideal stainless steel types and take a closer look at the cladding process.
Consider oil and gas pipelines: most use carbon steel. Their operating conditions, however, can expose pipelines to harsh chemicals and environments that may adversely affect carbon steel. Stainless steel cladding adds a thin layer of stainless steel over the carbon steel surface to increase its durability. Further advantages of stainless steel cladding include:
With many stainless steel types to choose from, cladding is possible for an array of unique applications. Because it enhances strength and provides the highest resistance against corrosion (due to its ferrite and austenite composition), duplex stainless steel is commonly used—especially when cladding pressure vessels and tanks. Common stainless steel grades, such as 304 and 316, can be used to clad components that are used outdoors.
There are several ways to perform stainless steel cladding, including hot roll bonding, cold roll bonding, explosive bonding, welding, and more. Hot roll bonding is a commonly used method where the plates of the base metal are placed on or between the plates of the stainless steel cladding layer.
The weld cladding process is another effective method. When welding, a layer of stainless steel is deposited over the carbon steel surface in single or multiple passes. GTAW or GMAW is popular with this method; the choice of weld process depends on factors like material use, accessibility, weld positioning, and cost-effectiveness.
In each case, the cladding process should meet all design and material standards specific to the industry, especially for critical applications like pressure vessels or pipelines. For instance, API 5LD covers the specification for CRA-clad steel pipes used for natural gas or petroleum pipeline systems. Listed below are standards specific to stainless steel cladding:
Additional stainless steel cladding design considerations include:
For cladding pipelines, pressure vessels, and structural components, stainless steel has become the top choice across industries because it can resist corrosion and high temperatures while providing enhanced strength and a clean finish. However, you must select the right cladding process to achieve optimal results.
Orbital GTAW is always a good option for weld cladding. The cladding process may require flexibility for complex geometries in cramped, uncomfortable spaces. Additionally, welders can be exposed to harmful fumes such as hexavalent chromium when working with stainless steel. Orbital GTAW eliminates these issues while delivering the highest quality stainless steel cladding for diverse applications.