What’s “pren”?

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Literally: Pitting Resistance Equivalent Number, which is a value obtained by a formula that takes into account the percentage of individual elements in a single casting, which gives an indication of corrosion resistance, higher or lower than other castings of this family of steels. Normally, the duplex value is between 33.5 and 35.5, while the superduplex ranges between 39.5 and 41.5.

Here’s the formula to calculate PREN value:  Cr%+3,3(Mo%+0,5W%)+16N%