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information
Chapter 8: Welding methods
Tubes not annealed - pickled
Welded tubes can be supplied in not annealed condition. This product undergoes the same production
process with the exception of the heat treatment. The tubes are instead submitted to a pickling
chemical treatment. The pickling bath is composed of Sulphuric and Fluoridric acids.
This process can eliminate, both on the outside and inside surface, and on the ends, any trace of
ferrous contamination and also any possible oxides which may be on the metal surface as a result
of mechanical working (welding rolls, abrasive belts, cutting equipment) and welding.
See picture n°5 – x50 not annealed tube
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01.2013