347H

Utilized in welding titanium and niobium stabilized 18Cr/8Ni stainless steel, specifically types 321H and 347H, this method is employed across various components like catalytic crackers, cyclones, transfer lines, furnace parts, steam piping, superheater headers, and gas and steam turbine elements. Its applications span industries including petrochemical, chemical, and power generation. The significance of alloy 16.8.2 cannot be overstated, serving as a more ductile alternative to 347H consumables to prevent in-service Heat-Affected Zone (HAZ) failure in 347H base material exceeding 12mm in thickness. When dealing with thicker sections of 321H/347H, the preferred choice is 16.8.2 consumables. For general corrosion resistance at temperatures up to 400°C, recommended consumables are 347 or 308L. In cryogenic applications (>0.38mm Charpy lateral expansion at –196°C), it is advisable to use unstabilized weld metal. Notably, no preheating or Post Weld Heat Treatment (PWHT) is required, and the maximum interpass temperature is limited to 250°C.

Controlled, high carbon Nb stabilized stainless steel for elevated temperature service.

Austenite with 2-9FN, typically 4FN (solid wire typically 8FN).

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