Methods for producing blank tube for cold drawing and for producing cold drawn tube
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United States of America Patent
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Mar 18, 2014
Grant Date -
Oct 18, 2012
app pub date -
Jun 20, 2012
filing date -
Dec 21, 2009
priority date (Note) -
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Abstract
A blank tube for cold drawing is used for the production of a longer-length, small-diameter tube such as a heat-transfer tube for steam generation in nuclear power facilities, wherein the blank tube will not cause scoring and chattering vibration in a drawing process. The blank tube is used to produce a cold drawn tube through cold drawing of the blank tube. The average surface roughness Ra (ANSI B46.1) of the inner surface of blank tube before drawing satisfies the condition: 0.10 μm≦Ra≦1.00 μm in the case of a blank tube for cold drawing for use in an oil-lubricated drawing. In particular, the surface roughness Ra satisfies the condition: 0.10 μm≦Ra≦0.50 μm in the case of a blank tube for use in a high-pressure lubrication drawing and made of an austenitic alloy for use in a heat-transfer tube for a steam generator.
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