Use & Application
These consumables are designed to weld equivalent ‘type 91’ 9CrMo steels modified with small additions of niobium, vanadium and nitrogen to give improved long term creep properties. These consumables are specifically intended for high integrity structural service at elevated temperature so the minor alloy additions responsible for its creep strength are kept above the minimum considered necessary to ensure satisfactory performance. In this case, weldments will be weakest in the softened (intercritical) HAZ region of parent material, as indicated by so-called ‘type IV’ failure in transverse weld creep tests. Modified 9CrMo steels are now widely used for components such as headers, main steam piping, valves and turbine casings, in fossil fueled power generating plants. They may also find future use in oil refineries and coal liquefaction and gasification plants.
Alloy type
Modified 9CrMo for high temperature creep resistance.
In the PWHT condition the microstructure consists of tempered martensite with alloy carbides.
Materials to be welded

EN W.Nr.: 1.4903 (X10CrMoVNb 9 1).
ASTM: A 213 T91 (seamless tubes), A 335 P91 (seamless pipes), A 387 Gr 91 (plates), A 182 / A336 F91 (forgings), A 217 C12A (castings), A 234 WP91, A 369 FP91.
ANFOR: NF A-49213/A-49219 Gr TU Z 10 CDVNb 09-01.

Products of the line 9CrMoV

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