High strength low carbon air bag quality seamless tubing
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
May 12, 1999
filing date -
May 12, 1999
priority date (Note) -
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Abstract
A process for manufacturing a low-carbon steel pressure vessel, which may be used as an inflator housing (18), comprises providing a cylindrical billet of low-carbon steel which comprises by weight about 0.07% to about 0.15% carbon, about 1% to about 2% manganese, less than about 0.02% phosphorous, less than about 0.015% sulfur, about 0.5% to about 2.10% chromium, about 0.2% to about 1.0% nickel, about 0.2% to about 0.7% molybdenum, less than about 0.65% copper, less than about 0.25% residual elements, and the balance of the composition iron. A tube is formed with a cylindrical wall by axially piercing the cylindrical billet, while the cylindrical billet is heated is at a temperature of about 1000.degree. C. to about 1300.degree. C. The thickness of the cylindrical wall is then reduced to a first thickness by a first cold drawing of the tube. The tube is annealed after the first cold drawing. The thickness of the cylindrical wall is further reduced to a second thickness by a second cold drawing. The cylindrical wall is reduced in thickness less than about 26% during the second cold drawing step.
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