SA516 Plate Material for Wet H2S Service

I would contact your metal supplier to see what they might recommend...I would think either would work, but your supplier might have some better information about their product specific qualities....and you might go into greater detail...I would say from what you have said that the SA516Gr 70(N) would do nicely...but I am not an expert in this area and do not possess all the pertinent information...

Contact a supplier and ask them. They are the experts in their field.

If they think you will buy from them, they will help you.

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A516 Grade 60 | SA516 Grade 60 - Brown McFarlane

A516 Grade 70 | SA516 Grade 70 - Brown McFarlane

Grade 70 is just normalized Grade 60.

The surprisingly large corrosion allowance of 6mm would lead me to consider another class of material. (I'm not familiar with what is best for H₂S service, though.)

Whatever material you are using, calculate the required thickness. If you can use a lesser thickness of a stronger material, the weight reduction may save some money. This becomes an economic decision of comparing possible alternatives.

How about asking the licensor first.