Crown ER 409Nb is a ferritic stainless steel welding wire. The addition of niobium results in a preferential reaction with carbon, which will prevent the chromium from forming carbides. This improves corrosion resistance, increases strength at elevated temperatures, and promotes a ferritic microstructure. Crown ER 409Nb is most often used to weld 409 or 409Ti base stainless steels. It is used primarily in the automotive industry for welding catalytic converters and other parts of the exhaust system.
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