Aluminum-killed medium-carbon steel sheet for containers and process for its preparation
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United States of America Patent
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Jan 30, 2007
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app pub date -
Jun 14, 2004
filing date -
Jul 1, 1999
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Abstract
A process is provided for preparation of an aluminum-killed medium-carbon steel sheet containing by weight from 0.040 to 0.080% of carbon, from 0.35 to 0.50% of manganese, from 0.040 to 0.070% of aluminum, from 0.004 to 0.006% of nitrogen, the remainder being iron and the inevitable trace impurities, wherein the steel contains carbon in free state, a grain count per mm.sup.2 greater than 20000 and, in the aged condition, has a percentage elongation A % satisfying the relationship: (640-Rm)/10.ltoreq.A %.ltoreq.(700-Rm)/l1 where Rm is the maximum rupture strength.
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