【HaiChuan Discussion】For the external welds of stainless steel pipes that do not come into contact with materials, why is pickling required?
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For the external welds of stainless steel pipes that do not come into contact with materials, why is pickling required? And if the pickling is not thorough, could that lead to secondary pollution?
And most of them aren’t painted; a quick brush with acid makes them look much better :)
Why aren’t the welds inside the pipe passivated? ? ?
Does the inside of the pipeline also need to be pickled and passivated?
Storage tanks show presence, while ordinary stainless steel pipes do not
For stainless steel pipes that use lubricating oil as the medium, the interior also needs to be pickled and passivated
In addition to aesthetics, it can also be used to clean and inspect the exterior of pipe welds
Will there be any corrosion reactions caused by external oxides and the atmosphere? ? ?
For high-pressure pipes made of material 321, passivation is required for the external welds, but not for the internal ones; moreover, passivation is not possible for the internal areas. Since the pipes are long and connected to various devices, stainless steel pipes in lubrication stations are typically passivated after they have been manufactured