Metal working – Method of mechanical manufacture – Gas and water specific plumbing component making
Reexamination Certificate
1999-05-12
2001-01-16
Cuda, I (Department: 3726)
Metal working
Method of mechanical manufacture
Gas and water specific plumbing component making
C029S428000
Reexamination Certificate
active
06173495
ABSTRACT:
FILED OF THE INVENTION
The present invention relates to a process for manufacturing a steel housing, and particularly relates to a process for manufacturing a steel housing of an inflator for inflating an inflatable vehicle occupant protection device.
BACKGROUND OF THE INVENTION
A known inflator for inflating a vehicle occupant protection device includes a quantity of gas, including a combustible gas, stored in an inflator housing. An igniter is actuatable to ignite the combustible gas. As the combustible gas burns, the combustion products heat the gas. The heated gas and the combustion products form an inflation fluid for inflating the vehicle occupant protection device.
SUMMARY OF THE INVENTION
In accordance with the present invention, a process for manufacturing a low-carbon steel pressure vessel, which may be used as an inflator housing, 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 with a cylindrical wall is formed by axially piercing the cylindrical billet, while the cylindrical billet is at a temperature of about 1000° C. to about 1300° 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.
Preferably, the tube is laser welded to an endcap of low-carbon steel and an endwall of low-carbon steel. The low-carbon steel employed in the endcap and the endwall 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.
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Cuda I
Tarolli, Sundheim, Covell Tummino & Szabo L.L.P.
TRW Inc.
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