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Thank you for your response. All samples were passivated. Our vendor tells me that they indeed use 316l with <0.002% sulfur. I wonder if it is the size of the MnS inclusions irrespective of low sulfur content in the bulk that is at the root cause?

Thank you very much. We just received test data; it shows that samples that did not receive any heat treatment and the ones that were heat treated in a belt-furnace (w/o foil covering) showed no evidence of pitting. But the samples that were heat treated in the vacuum oven with the foil...

Would you please suggest the grade and supplier for low sulfur (<0.002%) containing SS? It needs to be suitable for hydroforming. Thanks.

One of our devices is hydroformed from SS 316L. This device is heat treated at 1950F for 30-min and subsequently passivated. The devices are completely wrapped in SS foil during heat treatment in a vacuum oven. They show pitting during an aggressive coating operation. ESCA shows a presence...