Type/ Characteristics: Special agglomerated fluoride-basic type flux for welding austenitic stainless steels in combination with wire electrode according to DIN 8556. As to carbon content of the weld metal, AMA-AP720 is strictly neutral, so that, using suitable wire electrodes steels having extra low carbon content can be safely welded. It has no chromium compensation which is of importance if certain ferrite content in the weld deposit must be observed. Its metallurgical behavior as regards silicon and Manganese burn off will take place when using wire electrodes having a high Manganese content. AMA-AP720 is designed for welding thick sections. It is a hydrogen controlled flux deposition low hydrogen weld metal. AMA-AP720 is particularly suited to be used in tandem and multi-wire welding. It produces smooth and finely rippled weld beads merging into the base metal without undercut. AMA AP 720 can be used on DC (positive) or AC up to 800C. Damp flux shall be redried by backing at 300 350 c. Grain size according to DIN 32 522:2-20.
Main Constituents:
SiO2 + TiO2
CaO + MgO
Al2O3 + MnO
CaF2
15%
40%
20%
25%
Basicity as to boniszewskii: ~2.7
All -Weld metal analysis (typical values):
AMA Trade Name
DIN/EN
C
Cr
Ni
Mo
Nb
N
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
-
30-56
<0.03
20
16
3.0
-
0.15
30-55
<0.03
23
9
3.0
-
0.15
30-57
<0.15
22
12
-
-
-
30-58
<0.03
21
>60
9.0
-3.5
-
Mechanical properties of all-weld metal (typical values):
With Wire Electrode
Proof stress %0.2 ( 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
> 320
> 350
> 550
> 35
> 75
30 – 52
> 350
> 370
> 575
> 30
> 65
30 – 53
> 320
> 350
> 550
> 30
> 75
30 – 54
> 350
> 370
> 600
> 30
> 65
30 – 56
> 380
> 410
> 600
> 30
> 120
30 – 55
> 450
> 500
> 650
> 25
> 100
30 – 57
> 320
> 350
> 650
> 30
> 75
30 – 58
> 400
> 420
> 680
> 30
> 75
Application: Welding of austenitic stainless Cr Ni steel, particularly thick sections.
Materials
Material-No
With wire electrode
Material-No
X 2 Cr Ni 1911
1.4306
30 - 51
1.4316
X 5 Cr Ni 1810
1.4301
30 - 51
1.4316
X 6 Cr Ni Ti 1810
1.4541
30 - 52
1.4551
X 5 Cr Ni Nb 189
1.4543
30 - 52
1.4551
X 6 Cr Ni Nb 1810
1.4550
30 - 52
1.4551
X 12 Cr Ni Ti 189
1.4878
30 - 52
1.4551
X 2 Cr Ni Mo 17132
1.4404
30 - 53
1.4430
X 2 Cr Ni Mo 18142
1.4435
30 - 53
1.4430
X 5 Cr Ni Mo 17122
1.4401
30 - 53
1.4430
X 6 Cr Ni Mo Ti 17122
1.4571
30 - 54
1.4576
X 10 Cr Ni Mo Ti 1812
1.4573
30 - 54
1.4576
X 6 Cr Ni Mo Nb 17122
1.4580
30 - 54
1.4576
X 10 Cr Ni Mo Nb 1812
1.4583
30 - 54
1.4576
X 2 Cr Ni Mo N 22 5
1.4462
30 - 55
~1.4462
X 15 Cr Ni Si N 20 12
1.4828
30 - 57
1.4829
X 12 Cr Ni Ti N 18 9
1.4878
30 - 57
1.4828
X 2 Cr Ni 18 9
1.4306
30 - 56*
1.4455
X 5 Cr Ni 18 10
1.4301
30 - 56*
1.4455
X 6 Cr Ni Ti 18 10
1.4541
30 - 56*
1.4455
X 5 Cr Ni Nb 18 9
1.4543
30 - 56*
1.4455
X 6 Cr Ni Nb 18 19
1.4550
30 - 56*
1.4455
X 12 Cr Ni Ti 18 9
1.4878
30 - 56*
1.4455
X 2 Cr Ni Mo 17 13 2
1.4404
30 - 56*
1.4455
X 2 Cr Ni Mo 18 14 2
1.4435
30 - 56*
1.4455
X 5 Cr Ni Mo 17 12 2
1.4401
30 - 56*
1.4455
X 6 Cr Ni Mo Ti 17 12 2
1.4571
30 - 56*
1.4455
X 10 Cr Ni Ti Mo 18 12
1.4573
30 - 56*
1.4455
X 6 Cr Ni Mo Nb 17 12 2
1.4580
30 - 56*
1.4455
X 10 Cr Ni Mo Nb 18 12
1.4583
30 - 56*
1.4455
*If weld metal is required to be fully austenitic
Materials
Material-No
With wire electrode
Material-No
X 8 Ni 9
1.5662
30 - 56
1.4455
10 Ni 14
1.5637
30 - 56
1.4455
12 Ni 19
1.5680
30 - 56
1.4455
AMA AP 720 + 30 -56 is out standing for joining unalloyed and low alloy steels to high alloy steels.
