TIG welding rods for creep resisting steels

Classification DIN EN ISO

21952-A W CrMo91

Material No.


Classification AWS

A5.28 ER90S-B91


TÜV 11950, CE

Characteristics and application

TIG/GTAW rod for high temperature, creep resistant, modified 9%Cr-1%Mo martensitic steel (T91/P91). T91/P91 steel is commonly used at service temperatures up to 600°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 F91, A213 T91, A217 C12A, A234 WP91, A335 P91, A387 91

Typical analysis in %

C: 0,10
Si: 0,32
Mn: 0,50
Cr: 9,20
Ni: 0,45
Mo: 0,95
V: 0,20
Nb: 0,05

Yield strength in Mpa

≥ 520

Tensile strength in Mpa

≥ 620

Elongation in %

4d/5d: ≥16

Charpy-V-Value (ISO-V) in J

RT ≥ 47

Typical heat treatment

Preheat temperature: 200°C
Interpass temperature: max. 300°C
PWHT: 760°C

Other products

SAW: UP-P91 (S1CrMo91)