BF 40

Agglomerated Calcium-Silicate flux with neutral characteristic designed especially for joining / surfacing with the submerged-arc processes together with appropriate corrosion resistant filler metals such as solid or cored wires and strip electrodes (<120 mm width). Self-detaching slag without residuals, independent of the nubmer of deposited layers or preheating of the substrate, and the use of AC or DC (+/- polarity) are features of BF 40 flux. Apart from the low flux consumption, finely rippled weld beads with smooth tie-in and soft transition from features of BF 40 flux. Apart from the low flux consumption, finely rippled weld beads with smooth tie-in and soft transition from bead to bead are further characteristics. The chemical reaction via the flux (see alloying vector in the table) is rather constant and, more or less, limited to low Si-pick up and low Mn / Cr burn out. So, chemical deposits of overlays as requested according to the standards of stainless metals are achieved. Dilution with the substrate-an important influencing factor for the overlay microstructure-depends on the different welding variables; commonly dilution is below 20% if welding parameters are not excessive.

-For special hardfacing requirements BF 40 can be alloyed during the manufacturing with FeCr, FeMo, FeNi and other alloys to match the individual hardfacing jobs. These “active and taylored” BF 40 variants are developed and made according to the specific application conditions of the user, partly using the user’s filler metals. Therefore, a very close cooperation between the user and us is required before testing BF40 variants.