METHOD FOR MANUFACTURING HIGH-STRENGTH STEEL SHEET PARTS SUBJECT IN USE TO FATIGUE STRESSES
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United States of America Patent
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app pub date -
Feb 17, 2012
filing date -
Feb 18, 2011
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Abandoned
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Abstract
The manufacturing method comprises the steps of: carrying out one or more forming operations so as to give the desired geometry to the part; and subjecting the part thus formed to a single heat treatment having only a stress relieving treatment, which is preferably carried out at a temperature in the range from 530° C. to 580° C. for a time in the interval from 45 to 60 minutes and is followed by cooling of the part in air. By virtue of the formed part being subjected to a stress relieving heat treatment, the residual stress state due to the initial forming process and to the bead welding, if any, is eliminated or at least significantly reduced.
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