Conforming to：GB/T12470 S490AAS-SU34
Description: HJ 251 is defined as fused type fluxes with low manganese medium silicate and medium fluorine, color in light yellow to light green, with jaded stone form granules 10-60 meshes in size. They are suitable for use with D.C. power source, filler-wire will be connected to electrode positive (EP) good welding technological behavior.
Field of application: Fluxes match Cr-Mo steel filler-wire being for welding of pealite resistant-heat steel, for instance, turbine rotors and of other low alloy steel.
Typical compositions of fluxes in: (%)
|
SiO2+Al2O3 |
CaF2+CaO+MgO |
S |
P |
|
36-45 |
40-53 |
≤0.05 |
≤0.08 |
Mechanical properties of deposited metal: (GB/T12470 F48A0-H10Mn2)
|
Test Item |
ó s (Mpa) |
ó b (Mpa) |
δ 5( %) |
Akv (J) 0℃ |
|
Guaranteed Value |
≥400 |
490-660 |
≥20 |
≥27 |
|
Test Value |
414 |
530 |
30 |
115 |
Remarks:
1.Before welding, fluxes need to be baked two(2) hours at 300-350℃.
2.Removal of rust, oil, dirt, water, impurities etc in welding-areas.