[MW:18933] Etching on Duplex stainless steel pipes

Dear All

We have to do etching on duplex stainless steel pipes as part of the removal of arc strike. Can you please share your experience on the etchants used for this. 

I referred AS 2205.5.1, which describes a) Chrome regia solution, b)  Nitric acid/ hydrochloric acid solution or c) Ferric chloride as etchants for austenitic stainless steels. My doubt is whether it will affect the corrosion resistance of duplex steels.

Thanks and Regards

Harikrishnan

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