Presenter: Claes Tigerstrand
300-series austenitic stainless steels are widely used in API tanks and ASME vessels due to their high corrosion resistance and good fabricability. They are versatile and can be applied from cryogenic temperatures to elevated temperatures. However, their mechanical strength is moderate resulting in thicker walls when the design pressure is higher. Duplex stainless steel (DSS) can often serve as a great alternative with its higher strength but is not always a feasible solution. Moreover, there are manufacturers who are comfortable working with 300-series but are hesitant to move to DSS.
A potential solution to this challenge is to opt for a nitrogen alloyed austenitic stainless steel Supra 316plus (UNS S31655). This grade has a leaner chemistry than the regular Type 316L and comes with about 30% higher design strength depending on specification. It is approved for ASME Section VIII vessel design and pending for API 650 and 620 tank design. It can be welded using similar welding practices and consumables as Type 316L.
This presentation will highlight some of its benefits in various types of tanks and vessels.
