High toughness steel and a method for manufacturing the same
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United States of America Patent
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Feb 19, 2002
Grant Date -
N/A
app pub date -
Mar 2, 1999
filing date -
Mar 4, 1998
priority date (Note) -
Expired
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Abstract
Ups and downs having a cycle of not more than 5 .mu.m and an amplitude of not less than 200 nm are formed in a part of not less than 70% per unit length of a prior-austenite grain boundary which is observed in a linear form when seen from a vertical plane by a series of steps of subjecting a steel in a state of austenite to a deformation in not less than 30% of a total area reduction rate at a temperature region which is lower than recrystallization temperature of austenite, and subsequently cooling a deformed steel without causing neither recrystallization nor phase transformation of a diffusion type.
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