K-309LF description: K-309LF is designed for MAG welding of low carbon 22%Cr-12%Ni stainless steel. Dissimilar joint welds ; of and between high-strength, mild steels and lowalloyed QT-steels, stainless, ferritic Cr-and austenitic Cr-Ni-steels, manganese steels. Cladding ; for the first layer of corrosion resistant weld claddings on ferritic-perlitic steels in boiler and pressure vessel parts up to fine-grained steel S500N.