Non-coated condition is supplied with slight surface oil and protected ends in order to allow the storage of tubes in proper warehouses and for a reasonable period of time
INTERNAL
CLEANNESS
AND HUMIDITY
Guaranteed according to reference
norm limits
GUARANTEED MECHANICAL
CHARACTERISTICS
Tensile strenght ≥ 300
MPa
Yield point ≥ 180 MPa
Percentage elongation at break L0=5,65 √S0 ≥ 25%
COMPULSORY TESTING
EXPANDING
TEST
The test length
of tube that is expanded by an internal mandrel
over a length of about 10÷12 mm reaching
an increase of the outside diameter up to
20% over the nominal size, must not show
any cracking on visual inspection.
BENDING TEST
Test length of tube is wound
around a mandrel the diameter of which is
six times the tube’s outside diameter,
without developing any crack or leak.
FLATTENING
TEST
After flattening, the longitudinal
section of a test length of non fin-cut tube,
measuring about 50÷60 mm by crushing
tubes, must not show any split or crack of
the welding area.
The flattening is done by crushing tubes
between two parallel surfaces.
Refrigeration tubes
