Type/ Characteristics: Special agglomerated fluoride-basic type flux of extra low carbon quantity for welding austenitic stainless and heat resistant steels in combination with wire electrode according to DIN 8556. Owning to its metallurgical behavior In terms of carbon, AMA-OP71Cr is suited for welding extra low carbon steels. It contains chromium-bearing substances counteracting chromium burn-off. AMA-OP71Cr is characterized by causing a mean silicon pick-up and a slight manganese burn-off. It produces smooth and finely rippled weld beads merging into the base metal without undercut. Owning to excellent slag removal, AMA-OP71Cr is well suited for fillet welding. AMA-OP71Cr can be used on DC+ up to 800C.
Damp flux shall be re-dried by baking at 300°C – 350°C Grain size according to DIN 32 522:2-20
Main Constituents:
SiO2 + TiO2
CaO + MgO
Al2O3 + MnO
CaF2
30%
30%
10%
25%
Basicity to boniszewskii: ~1.6
All -Weld metal analysis (typical values):
AMA Trade Name
DIN/EN
C
Cr
Ni
Mo
Nb
30-51
ER308L
<0.03
>18
>9
-
-
30-52
ER347
<0.07
>18
>9
-
>8×C
30-53
ER316L
<0.03
>18
>10
2.5
-
30-54
ER318
<0.07
>18
>10
2.5
>8×C
Mechanical properties of all-weld metal (typical values):
With Wire Electrode
Proof stress %2.0 ( N/mm 2 )
Proof stress %0.1 ( N/mm 2 )
Tensile Strength ( N/mm 2 )
Elongation Lo = 5d (%)
Impact energy (Joule)ISO - V 20°C+
30 – 51
> 550
> 350
> 320
> 35
> 75
30 – 52
> 575
> 370
> 350
> 30
> 65
30 – 53
> 550
> 350
> 320
> 30
> 75
30 – 54
> 600
> 370
> 350
> 30
> 65
Application: joint welding of austenitic stainless Cr Ni steels, preferably for thinner plates:
