Glossary
Seamless Tubes
Steel
Seamless tubes are made from solid blocks of steel that are pierced and drawn into tube shape. Seamless tubes have greater strength than welded tubes because of their homogenous microstructure, but are much more expensive to produce. They are made by rolling a preheated billet between offset rolls which is then pierced with a pointed bar or plug to create a tube shell. This is then elongated in a multi-stand rolling mill to achieve the desired thickness
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Anonymous
Very good overview of the weekly steel market.
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