Type 25Cr duplex
Ferritic/austenitic stainless steel alloys with 40 u PREN u 45.
EXAMPLES UNS S32750 and S32760 steels.
Source: API RP 17A Addendum 1, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, December 2010. Global Standards
Source: ISO 21457:2010, Petroleum and natural gas industries — Materials selection and corrosion control for oil and gas production systems, First Edition,September 2010. Global Standards