Do the inner and outer surfaces of 2507 duplex steel pressure pipes need to be pickled and passivated?
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Do the inner and outer surfaces of 2507 duplex steel pressure pipes require pickling and passivation (including degreasing)? What concentration of solution should be used for treatment if necessary?
Can duplex stainless steel be pickled and passivated? http://bbs.hcbbs.com/thread-120133-1-1.html (Source: Haichuan Chemical Industry Forum)
It should be necessary, after all, it’s still a type of stainless steel right?:P
Do the inner and outer surfaces of SAF2507 duplex steel pressure pipes require pickling and passivation (including degreasing)? Answer: Yes, it is needed. What concentration of solution should be used for treatment if necessary? Answer: The same as that of ordinary stainless steel is sufficient; however, SAF2507 duplex steel has a higher Cr content, which requires more time for pickling and passivation. For specific details, refer to AVESTA’s manual on acid washing and passivation of stainless steel surfaces.