| 摘要 |
<p>A metal container for filters is envisaged, comprising an elongated tubular body suitable for housing at least one filter and a dome portion arranged to close one end of the tubular body, the dome portion and the tubular body constituting a single piece in drawn stainless steel. The procedure consists in effecting cold drawing of stainless steel sheet in such a way as to form a single bell-shaped piece, in subjecting the bell-shaped piece to an annealing heat treatment, and in subjecting the internal surface of the surfaces to low-temperature lapping. <IMAGE></p> |
