Method for setting shape and working stress, and working environment of steel member
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United States of America Patent
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Feb 25, 2003
Grant Date -
Apr 18, 2002
app pub date -
Aug 29, 2001
filing date -
Aug 31, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A delayed fracture is effectively prevented by appropriately setting a shape and working stress, and working environment of a high strength member having more than 1,000 MPa of tensile strength. For this end, the relationship between a maximum value of diffusible hydrogen contents of unfailed specimens (H.sub.c) and Weibull stress are found and the content of diffusible hydrogen entered into steel from the environment due to corrosion during the use of the steel member (H.sub.e) is also found. Then, Weibull stress in the H.sub.c that is equal to the H.sub.e is found, thus determining the shape and working stress of the steel member so as to provide stress below the Weibull stress.
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