Is Solution Annealing of 316 Stainless after Machining Recommended? 1

[beh188]

For applications where you are concerned about corrosion resistance of 316 stainless steel, and you want to minimize carbide precipitation, is it typically necessary to conduct a solution anneal treatment on parts after machining ? I am wondering if the machining process could cause excess heat or cold working of the surface that could cause carbides to precipitate. I am also concerned about the effects of machining because I want the parts to conform to NACE MR-01-75 after machining. The raw material does meet this NACE spec.

 

[metengr]

For applications where you are concerned about corrosion resistance of 316 stainless steel, and you want to minimize carbide precipitation, is it typically necessary to conduct a solution anneal treatment on parts after machining ?

No.

 

[metman]

I agree with metengr and I am a metallurgist/machinist.

 

[EdStainless]

No, but you should consider nitric acid passivation to remove Fe from the surface of the parts. Normal handling and machining practices will involve contact with steel, the minute amounts of Fe transferred in these contacts will create sites where corrosion will initiate. Passivation is a cleaning process intended to remove this Fe from the surface.

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