Microalloyed steel and process for preparing a railroad joint bar
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United States of America Patent
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May 21, 1991
Grant Date -
N/A
app pub date -
Jun 29, 1989
filing date -
Jun 29, 1989
priority date (Note) -
Expired
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Abstract
A microalloyed, fully killed steel has a composition, in weight percent, of from about 0.20 to about 0.45 percent carbon, from about 0.90 to about 1.70 percent manganese, from about 0.10 to about 0.35 percent silicon, from about 0.01 to about 0.04 percent aluminum, from about 0.05 to about 0.20 percent vanadium, from about 0.008 to about 0.024 percent nitrogen, balance iron. The steel is particularly useful when hot rolled to a railway joint bar section, and air cooled. The resulting joint bar meets AREA specifications in the as-rolled condition, without the need for a reheat and oil quench heat treatment after rolling.
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