| 摘要 |
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<2 >greater than 20000 and, in the aged condition, has a percentage elongation A % satisfying the relationship: (640-Rm)/10<=A%<=(700-Rm)/11 where Rm is the maximum rupture strength.
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