Aluminum-killed medium-carbon steel sheet for containers

   
   

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)/11 where Rm is the maximum rupture strength.

Um processo é fornecido para a preparação de uma folha de aço alumínio-matada do meio-carbono que contem pelo peso de 0.040 a 0.080% do carbono, 0.35 a 0.50% do manganês, 0.040 a 0.070% do alumínio, 0.004 a 0.006% do nitrogênio, o restante que é ferro e as impurezas inevitáveis do traço, wherein o aço contem o carbono no estado livre, uma contagem da grão por mm.sup.2 mais extremamente de 20000 e, na condição envelhecida, tem um elongation A % da porcentagem satisfer ao relacionamento: (640-Rm)/10.ltoreq.A %.ltoreq.(700-Rm)/11 onde Rm é a força máxima da ruptura.

 
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