Ultra-fine grain steel and method for producing it
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United States of America Patent
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Apr 24, 2001
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app pub date -
Sep 21, 1998
filing date -
Sep 22, 1997
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Abstract
The invention provides an ultra-fine grain steel comprising fine ferrite grains as oriented at random and surrounded by large angle grain boundaries. The steel comprises fine ferrite grains having a mean grain size of not larger and 3.0 .mu.m and surrounded by large angle grain boundaries having an misorientation not smaller than 15.degree..
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