Stainless steel pickling
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In accordance with GB/T20801.4-2020, the welds of stainless steel pipes and the pipe components shall be pickled and passivated in accordance with the design documents. Nitric acid is used for pickling; are there any other pickling solutions? What are the differences in the use of pickling solutions? Does it have to be pickled?
As per the regulations, stainless steel pipes and welds do indeed need to be pickled and passivated in order to remove oxide layers and contaminants and improve their corrosion resistance. The commonly used pickling solution is mainly nitric acid, but mixed acids (such as nitric acid + hydrochloric acid) can also be used. Various pickling solutions have different effects and suitability for different levels of contamination and types of metals. Whether pickling is necessary depends on the requirements of the design documents and engineering needs; generally, pickling is required to ensure quality and performance. .
Stainless steel is generally pickled, but there aren’t many pipes