Air-cooling low-carbon bainitic steel
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United States of America Patent
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Mar 14, 1989
Grant Date -
N/A
app pub date -
Jul 31, 1987
filing date -
Jul 31, 1987
priority date (Note) -
Expired
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Abstract
Steel articles have a granular bainite microstructure on continuous air cooling, from hot working temperature, of a low cost, tough, high strength, low alloy (HSLA) steel having a composition which, in broadest scope, scope, consists essentially, by weight percent, of 0.08 to 0.25% carbon, 0.30 to 1.5% silicon, 2.0 to 3.2% manganese and 0.005 to 0.005% boron. The steel composition preferably contains, in one aspect of the invention: 0.08 to 0.18% carbon, 0.3 to 1.2% silicon, 2.1% to 2.5% manganese and 0.005 to 0.004% boron; and in another aspect: 0.08 to 0.18% carbon 0.7 to 1.2% silicon, 2.7 to 3.1% manganese, and 0.0005 to 0.004% boron. The steel optionally may contain, by weight percent: up to 0.10 calcium and up to.0.20%, preferably less than 0.01%, sulfur, or up to 0.10% lead; up to 0.10%, especially 0.04 to 0.10%, vanadium, and up to 1.5% chromium. The steel is substantially free of molybdenum, tungsten and other alloying elements, except for residual amounts.
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