Sandvik 21.11.LNb is a niobium stabilized chromium-nickel strip electrode used for electro-slag welding (ESW) to deposit a single layer overlay of stabilized corrosion resistant alloy of 19%Cr/9%Ni composition on carbon- and low alloyed steels.
It can also be combined with Sandvik 19.9.LNb for surfacing of two layer overlays.
- ISO 14343: 22 11 L Nb
- AWS A5.9/ASME SFA5.9: EQ”309LNb”
Contact your nearest sales office for details.
Chemical composition (nominal) %
The ferrite content is nominally FN 14 according to WRC-92.
Sandvik 21.11.LNb is mostly used for corrosion resistant weld surfacing of components in the petrochemical industry at service temperatures up to 850°C but is also used in the chemical and nuclear industries. Typical components are pressure vessels, heat exchangers, shafts, industrial piping etc.
It is often used as transition layer on which a second layer is welded, using 19.9.LNb for better corrosion resistance.
Weld metal characteristics
Typical chemical composition of single layer obtained on C-Mn steel and low-alloy steel.
|Welding process and consumable||Type of overlay||C||Cr||Ni||FN, WRC|
|ESW Sandvik 21.11.LNb/47S||347, E347||≤0.06||17.5-19.5||9-10.5||3-8|
Consider the figures as examples. Parameters selected and conditions influence the result. Please contact Sandvik for details and guidelines.
Mechanical properties of overlay
Passes side bend testing according to ASME Section IX.
The resistance to general corrosion is good. It is a general purpose overlay for mildly corrosive media, also at elevated temperatures for example in the petrochemical industry.
The resistance to intergranular corrosion in Strauss testing (ASTM A262 Practice E) is good also after post-weld heat-treatment.
Recommended fluxes for Sandvik 21.11.LNb
|Sandvik 49S||ESW-High speed|