of the samples revealed that the grain count per mm 2 is larger greater than 20000 and that the carbides when they are formed comprise intergranular gementite thus this manufacturing process makes it possible to obtain an aluminum killed medium carbon steel for containers comprising by weight between 0 040 and 0 080 of carbon between 0 35 and 0 50 of manganese between 0 040 and 0 070 of aluminum between 0 0035 and 0 0060 of nitrogen the remainder being iron and the inevitable trace impurities which steel has in the aged condition a percentage elongation a satisfying the relationship as an alternative embodiment it is possible to combine with the rapid cooling a secondary low temperature thermal treatment prior to the skin pass operation in this case the manufacturing process for an aluminum killed medium carbon steel strip for containers comprises the following stages supplying a hot rolled steel strip which contains by weight from 0 040 to 0 080 of carbon from 0 15 to 0 25 of manganese from 0 040 to 0 070 of aluminum from 0 0035 to 0 0060 of nitrogen the remainder being iron and the inevitable trace impurities raising the temperature up to a temperature higher than the temperature of onset of pearlitic transformation ac 1 holding the strip above this temperature for a duration of longer than 10 seconds rapidly cooling the strip to a temperature of below 100 u00b0 c.