Use & Application
Used to weld titanium and niobium stabilized 18/8 high carbon stainless steel types 321H and 347H. Applications include **catalytic crackers (cat crackers), cyclones, transfer lines, furnace parts, steam piping, superheater headers, some gas and steam turbine components**, used in petrochemical, chemical process plants and in power generation industries. Note that the alloy 16.8.2 was developed as a more ductile alternative to 347H consumables to avoid in-service HAZ failure in 347H base material of >12mm thickness. For this reason when joining thicker section 321H/347H the 16.8.2 consumables are considered a preferable alternative. For welding 321/347 for general corrosion resisting applications at temperatures up to about 400°C use 347 or 308L consumables. For cryogenic applications requiring >0.38mm Charpy lateral expansion at –196°C, use unstabilised weld metal with low carbon and controlled ferrite. No preheat or PWHT required; maximum interpass temperature 250°C.
Alloy type
Controlled, high carbon Nb stabilized stainless steel for elevated temperature service.
Microstructure
Austenite with 2-9FN, typically 4FN (solid wire typically 8FN).
Materials to be welded

EN W.Nr.: 1.4941 (X6CrNiTiB18-10), 1.4961 (X8CrNiNb16-13), 1.4878 (X8CrNiTi18-10).
ASTM: 321H, 347H.
UNS: S32109, S34709.

Products of the line 347H

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