Fine ferrite-based structure steel production method
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United States of America Patent
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Jun 3, 2003
Grant Date -
Feb 7, 2002
app pub date -
Sep 21, 1998
filing date -
Sep 22, 1997
priority date (Note) -
Expired
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Abstract
A fine ferrite-based steel is disclosed, wherein at least 60% of the ferrite grain boundary is a large angle grain boundary of at least 15.degree., and the mean ferrite grain size is not more than 2.5 .mu.m. The fine ferrite-based steel of the invention has a high strength and a long fatigue life.
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