(1) After pickling, all rust and oil stains on the inner wall of the steel pipe are removed, and the cleanliness should meet the relevant standards.
(2) Pickled parts must not be pickled. If steel pipes are soaked in pickling liquid for too long, the surface of the steel will become rough and form honeycomb pits.
(3) Pickling parts must not be under-pickled. If the steel pipe is soaked in the pickling solution for too short a time or the pickling solution concentration is not enough, the steel pipe will still have a thin rust or iron oxide scale that has not been removed after pickling.
(4) Ensure that the threads and non-acid-resistant seals are not corroded. Yellow oil should be applied to the threads before pickling. The non-acid-resistant seals should be temporarily replaced with acid-resistant seals.
Post time: Oct-17-2023