公开(公告)号：US20210071287A1

公开(公告)日：2021-03-11

申请号：US16771951

申请日：2018-12-20

Applicant: SAIPEM S.p.A.

Inventor： Giulio Paci ,  Mara Quattrocchi ,  Lino Carlessi ,  Alberto Serrafero

IPC: C22C38/52 ,  C22C38/42 ,  C22C38/44 ,  C22C38/02 ,  C22C38/00 ,  B01J19/02 ,  C07C273/02

Abstract: A duplex stainless steel for use in a urea production plant and/or in a urea production process, containing in weight percentage (% w): C 0.03 or less; Si 0.5 or less; Mn 2.5 or less; Cr from more than 30.0 to 35.0; Ni from 5.5 to 8.0; Co from 0.01 to 0.8; Mo from 2.0 to 2.5; W 2.5 or less; N from 0.3 to 0.6; Cu 1.0 or less; and having one or more of: Ca 0.0040 or less; Mg 0.0040 or less; one or more rare-earth elements in a total amount of 0.1 or less; the balance being Fe and impurities; and satisfying the relationship: Z=1.062 (Ni+Co)+4.185 Mo is between 14.95 and 19.80.