BF 16
High-basic flux for SAW of low alloy steels and CrMo(Ni) alloys
Description & applications
A highly basic, agglomerated flux with a chemical composition and a production method, which guarantees almost neutral metallurgical reactions. This flux offers low oxygen and low hydrogen potentials, which permits submerged-arc welding of crack-sensitive heat treatable or heat resistant low-alloy steels and high alloy martensitic materials. When shape- or build-up welding, for example in turbine roto or disc repairs, constant chemistry of the deposit and high deposition rates can be achieved, even with multi-wire processes. BF 16 shows goods welding characteristics with smooth tie-in and weld bead appearance without slag inclusions or « tiger-tracks », even when high interpass temperature are experienced. Slag is self-detaching, including in narrow-groove joints.
BF 16 is a next-to-neutral flux, without Cr-, Ni- or Mo-compensation. Due to pre-fused raw materials the alloy vectors of the flux (metallurgical reactions) are constant and nearly independent of the welding parameters.
Sample of 10-layer-pad with BF 16 + ER 410NiMo-wire:
Pick-up:C +0.005 / 0.01%Si +0.05 / 0.1%Mn +0.05 / 0.15%
Burn-off :Cr -0.1 / 0.3%Ni -0.05 / 0.2%Mo -0.05 / 0.2%
Classification
| EN 760 | ISO 14174 |
|---|---|
| SA FB 1 55 DC | S A FB 1 55 DC H5 |
Typical weld metal composition (%)
| SiO2 + TiO2 | Al2O3 + MnO | MgO | CaO+CaF2 |
|---|---|---|---|
| 15 | 20 | 30 | 35 |
Packaging
25 kg PE-coated aluminium bags
Application Instructions
Designed originally for joining soft-martensitic metal (13Cr4Ni / CA6NM) or shape-welding and surfacing of turbines in combination with solid and metal powder cored wires such as 410NiMo. Due to its welding characteristics, BF 16 can be combined with many standard low-alloy wires for joining of fine-grained structural steels, heat-resistant or heat-treatable low-alloy CrMo(Ni)-materials as used in the fabrication of components for the chemical / petroleum and power industries.
Also applicable for joining of the new supermartensitic steels 13Cr4.5Ni3Mo together with 13Cr6Ni3Mo-wire.
Metallurgical Behaviour
Flux Type
Fluoride-Basic (High-basic)
Flux Density
1,1 kg/dm³(l)
Grain Size
2-20 (0,2 - 2,0 mm); Tyler 8 x 65
Current-Carrying Capacity
800 A (DC or AC / 1 wire 4.0 mm)
Storage and redrying
BF 16 shall be handled and stored according to given recommendation (dry condition up to 3 years, un-openen bag). If however, baking is necessary, flux should be baked at 300 + 50 °C effective flux temperature.