Production method of ultra fine grain steel
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United States of America Patent
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Oct 15, 2002
Grant Date -
N/A
app pub date -
Feb 24, 2000
filing date -
Feb 26, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of producing a ultra fine grain steel made of ferrite having a mean grain size of not larger that 3 .mu.m as the base phase, after ingoting raw materials, by austenitizing the ingot by heating it to a temperature of at least an Ac 3 point, then, applying compression working of a reduction ratio of at least 50% at a temperature of from an Ae 3 point or lower to an Ar 3 point -150.degree. C., or at a temperature of at least 550.degree. C., and thereafter, cooling, wherein the strain rate as compression working is in the range of from 0.001 to 10/second.
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