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Flux for Submerged Arc welding of General Struct
AMA AP720
| Standards: DIN 32 522 : | B FB 6 55455 AC 8 MHP 5 |
| EN 760 : | SA FB 2 55 AC |
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):
| With Wire electrode | Weight - % | ||||||
|---|---|---|---|---|---|---|---|
| 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.