411 REFERENCE · Wiktionary
PREN
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Noun
en pitting resistance equivalent number.
en Hans Berns Werner Theisen Gillian Scheibelein Ferrous Materials: Steel and Cast Iron Berlin; London Springer 2008 324 https://archive.org/details/ferrousmaterials0000bern/page/324/mode/1up 978-3-540-71848-2 Tungsten reinforces the effect of Mo, so that superduplex steel X2CrNiMoCuWN25-7-4 with 0.25% N, 0.8% W and 0.8% Cu reaches PREN > 40.