SD 2507Cu (UR 52N+) is a super duplex stainless steel with 25% Cr and a PREN value higher than 40. The minimum guaranteed yield strength is 550 MPa which allows the designer to reduce weight. The molybdenum and nitrogen additions have been optimized in order to obtain the best corrosion resistance properties even for heavy plates. High nitrogen content improves the structure stability particularly in HAZ. Its corrosion resistance is much better than UR B6/N08904 and roughly equivalent to 6 Mo super austenitic alloys.
Copper additions increase the corrosion resistance properties, particularly in sulphuric acid media.
SD 2507Cu is a cost efficient grade designed for offshore, marine, phosphoric acid, sulphuric acid applications... as well as pollution control equipments
Equivalent grade :
International Standards:
SD 2507Cu UR 52N+
EURONORM 1. 4507 - X2 Cr Ni Mo Cu N 25.6.3
AFNOR Z3 CNDU 25.07 AZ
ASTM. UNS S32550/S32520
Chemical Analysis :
C : 0.03
Cr : 25
Ni : 6.5
Mo : 3.5
N : 0.25
Cu : 1.50
Mechanical Properties
Yield strength, Rp 0.2: 550 N/mm2,
Tensile strength, Rm : 770 N/mm2
Elongation, AS : 25 %