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The metal tubes utilized for the realization of the micropiles exist in different qualities of steel, with Chemical and mechanical characteristics thath can be guaranteed with a certification released by recognized control labs.
They differ between the new steel ones St 52 type and the re-emplyment J55-K55-N80 steel ones that come from petrol research yards and are examined and inspected before their use.
Table n.1 illustrates the mechanical features of the different qualities of steel.
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