254SMO (UNS S31254, ASTM F44, 1.4547) is a super austenitic stainless steel, that can be substituted by super duplex for many applications.
The nearest equivalent cast specifications to UNS S32750 are ASTM A890, ASTM A995 and ASME SA351/995 grade CE3Mn or 5A.
The nearest equivalent casting specifications for UNS S32760 are ASTM A890, ASTM A995 and ASME SA351/995 grade CD3MWCuN or 6A.
S31254 is the Unified Numbering System (UNS) designation for an austenitic stainless steel alloy most commonly known as 254SMO or 6Mo.
SAF2507 is a registered trademark of Sandvik. SAF stands for Sandvik Austenite Ferrite, whilst 2507 references the UNS S32750 caption.
S31803 is the Unified Numbering System (UNS) designation for the original duplex stainless steel.
The superior combination of strength and corrosion resistance achieved by super duplex stainless steels makes them an ideal choice for piping.
The industry specifications NACE MR1075 and Norsok M650 would require the three main super duplex stainless steels to have a PREN>40.
Super duplex stainless steels have comparable corrosion resistance, but greater strength and lower costs than super austenitics.
By following the correct weld procedures and using suitable filler metals, it is possible to achieve good welds in super duplex alloys.
The cost to produce super duplex stainless steel will depend upon the exact composition, product form, size, inspection and mill producer.
The grade UNS S32205 (1.4462, F51) is the most commonly specified duplex stainless steel.