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In short: Tube is measured by outside diameter, pipe is measured by inside diameter. There is often confusion as to which size die the customer actually needs - Pipe Size or Tubing Size. Keep in mind that pipe size refers to a nominal - not actual - inside pipe diameter. Schedule refers to the pipe's wall thickness.
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Pipes are always round in shape. Tubes can be square,rectangular or round.Tube is stronger than pipe.Pipe is typically available in larger sizes than tube.Tube is available in hot rolled steel and cold rolled steel. Pipe is typically black steel (hot rolled). 
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