Methods and apparatus for manufacturing seamless tube
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United States of America Patent
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May 29, 1990
Issued Date -
N/A
app pub date -
Dec 23, 1987
filing date -
Sep 1, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Ingots hot from rolling are pierced to form a hollow ingot by means of an internal tool of a press or skew-rolling line, and are subsequently elongated to form a tubular bloom by a stretching unit provided with a mandrel rod, and are finally finish-rolled. When inserting or withdrawing the internal tool into or out of the hollow ingot or the mandrel rod into or out of the tubular bloom, inert gas is introduced into the freed interior space in order to prevent scaling of the interior wall of the tubular bloom.
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