API Sucker Rods - Tenaris

API and Premium Rods
Both the API and Premium rod lines are manufactured under a strict quality assurance
system in compliance with ISO 9000 standards and certified by API Q1.
Both API and Premium rods
are manufactured from high
quality steel bars.
During the manufacturing
process, all rods are straightened
and inspected by
non-destructive eddy current
control equipment. This
inspection controls 100%
of raw materials in order
to detect transversal and
longitudinal discontinuities.
Before forging, ends are
heated in induction furnaces.
Then rods are full-length
inspected and thermally
treated in specially designed
furnaces in order to obtain
uniform mechanical and
metallurgical properties all
along the rod.
Once rods have been thermally
treated, they undergo a
shot pinning process, where
their external fibers are compressed
and fatigue resistance
is improved. Prior to machining,
rod ends are inspected
in a specially designed bench.
Machining and threading
processes are performed in
state-of-the-art CNC (Computerized
Numeric Control)
equipment which results in
high quality surface finishing
of joint seals.
Threads are obtained by a
cold rolled process, which
ensures a higher fatigue
resistance. Finally, prior to
packing, rods are protected
with an oil-soluble paint,
avoiding rusting during
transportation and storage.
High strength Premium rods
undergo different thermal
treatments, according to the
desired degree in order to
achieve the metallographic
structure and mechanical properties
specified in each case.