Welded pipe's structure typically consists of austenite and ferrite, which provides a combination of the corrosion resistance in steel pipe applications. Thus welded pipe made from stainless steels will have greater strength since duplex stainless steels can also be welded. However, care must be exercised so as to maintain the correct balance of austenite and ferrite in welded pipe. The thermal expansion in steel pipe applications lies in the austenitic stainless steels. On the other hand, other thermal properties are similar to plain carbon steels in some of the steel pipe applications. Formability of welded steel pipe is reasonable, but higher forces than those used for stainless steel pipes are required.
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