UP-P91 (S1CrMo91)

SAW (submerged arc welding) wires for creep resisting steel

Quality	UP-P91 (S1 CrMo91)
Classification DIN EN ISO	24598-A-S S CrMo91
Material No.	-
Classification AWS	A5.23 EB91
Approvals	TÜV 03274, CE
Characteristics and application	Submerged arc welding wire for high temperature, creep resisting, modified 9%Cr-1%Mo martensitic steel (T91/P91). T91/P91 steel is commonly used at service temperatures up to 620°C and the UP-P91 wire has approval for long term service up to 650°C. V, Nb and N additions provide this ‘creep strength enhanced ferritic’ (CSEF) alloy with improved high temperature creep resistance compared to standard CrMo creep resistant alloys. Alloy T91/P91 is widely used in the power generating industry for fossil fuel ultra-super-critical (USC) power plant boilers and turbines; the alloy is also finding applications in the chemical and oil and gas industries.
Base materials	For matching P91, 9%Cr-1%Mo modified, creep resisting martensitic steels. X10CrMoVNb 9 1 ASTM: A182/A336 grade F91, A213 grade T91, A217 grade C12A, A234 grade WP91, A335 grade P91, A387 grade 91
Typical analysis in %	C: 0,10 Si: 0,32 Mn: 0,50 Cr: 8,70 Ni: 0,60 Mo: 1,00 V: 0,20 Nb: 0,04
Yield strength in Mpa	≥540
Tensile strength in Mpa	≥620
Elongation in %	4d/5d: ≥17
Typical heat treatment	Preheat temperature: 200°C Interpass temperature: max. 300°C PWHT: 760°C
Other products	SAW: flux Fliess 1980 MIG/GMAW: ED-SG P91 TIG/GTAW: WSG P91