What is the procedure to make stainless still pipe and is this pipe is safe to use for drinking water pipe line?

What is the procedure to make stainless still pipe and is this pipe is safe to use for drinking water pipe line?
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The making of stainless steel pipe is a long and intense process. There is a piece of round bar that is heated at first and then a mandrel is inserted into it giving it a round and hollow shape. Due to its irregular shape the pipe is rolled continuously and cooled down with chilled water for making it hard. And of course the stainless steel pipe is safe for drinking water as it is resistant to corrosion and is much durable.
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