AMA AP720

اکتبر 1, 2019ehsanhs95Fluxes for Submerged Arc welding of Austenitic Sta

AMA AP720	Product Name:
B FB 6 55455 AC 8 MHP 5	DIN32 522:
SA FB 2 55 AC	EN 760:

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 baking at 300°C-350°C
Grain size according to DIN 32 522:2-20

Main constituents:

CaF2

Al2O3 + MnO

CaO + MgO

SiO₂ + TiO₂

25%

20%

40%

15%

Basicity as to boniszewskii: ~2.7

all-weld metal analysis( typical values ):

Weight %						With Wire Electrode
N	Nb	Mo	Ni	Cr	C	DIN/EN	AMA Trade Name
–	–	–	> 9	> 18	< 0.03	ER308L	30-51
–	> 8 × C	–	> 9	> 18	< 0.07	ER347	30-52
–	–	2.5	> 10	> 18	< 0.03	ER316L	30-53
–	> 8 × C	2.5	> 10	> 18	< 0.07	ER318	30-54
0.15	–	3.0	16	20	< 0.03		30-56
0.15	–	3.0	9	23	< 0.03		30-55
–	–	–	12	22	< 0.15		30-57
–	3.5	9.0	> 60	21	< 0.03		30-58

Mechanical properties of all-weld metal (typical values ):

Impact energy (Joule) ISO – V	Elongation Lo = 5d %	Tensile Strength (N/mm²)	Proof stress (N/mm²) 1%	Proof stress (N/mm²) 0.2%	With Wire Electrode
+20°C	Elongation Lo = 5d %	Tensile Strength (N/mm²)	Proof stress (N/mm²) 1%	Proof stress (N/mm²) 0.2%
> 75	> 35	> 550	> 350	> 320	30-51
> 65	> 30	> 575	> 370	> 350	30-52
> 75	> 30	> 550	> 350	> 320	30-53
> 65	> 30	> 600	> 370	> 350	30-54
> 120	> 30	> 600	> 410	> 380	30-56
> 100	> 25	> 650	> 500	> 450	30-55
> 75	> 30	> 650	> 350	> 320	30-57
> 75	> 30	> 680	> 420	> 400	30-58

:Application
Welding of austenitic stainless Cr Ni steel, particularly thick sections

Material-No	With wire electrode	Material-No	Materials
1.4316	30-51	1.4306	X 2 Cr Ni 19 11
1.4316	30-51	1.4301	X 5 Cr Ni 18 10
1.4551	30-52	1.4541	X 6 Cr Ni Ti 18 10
1.4551	30-52	1.4543	X 5 Cr Ni Nb 18 9
1.4551	30-52	1.4550	X 6 Cr Ni Nb 18 10
1.4551	30-52	1.4878	X 12 Cr Ni Ti 18 9
1.4430	30-53	1.4404	X 2 Cr Ni Mo 17 13 2
1.4430	30-53	1.4435	X 2 Cr Ni Mo 18 14 2
1.4430	30-53	1.4401	X 5 Cr Ni Mo 17 12 2
1.4576	30-54	1.4571	X 6 Cr Ni Mo Ti 17 12 2
1.4576	30-54	1.4573	X 10 Cr Ni Mo Ti 18 12
1.4576	30-54	1.4580	X 6 Cr Ni Mo Nb 17 12 2
1.4576	30-54	1.4583	X 10 Cr Ni Mo Nb 18 12
~1.4462	30-55	1.4462	X 2 Cr Ni Mo N 22 5
1.4829	30-57	1.4828	X 15 Cr Ni Si 20 12
1.4828	30-57	1.4878	X 12 Cr Ni Ti 18 9
1.4455	30-56*	1.4306	X 2 Cr Ni 18 9
1.4455	30-56*	1.4301	X 5 Cr Ni 18 10
1.4455	30-56*	1.4541	X 6 Cr Ni Ti 18 10
1.4455	30-56*	1.4543	X 5 Cr Ni Nb 18 9
1.4455	30-56*	1.4550	X 6 Cr Ni Nb 18 19
1.4455	30-56*	1.4878	X 12 Cr Ni Ti 18 9
1.4455	30-56*	1.4404	X 2 Cr Ni Mo 17 13 2
1.4455	30-56*	1.4435	X 2 Cr Ni Mo 18 14 2
1.4455	30-56*	1.4401	X 5 Cr Ni Mo 17 12 2
1.4455	30-56*	1.4571	X 6 Cr Ni Mo Ti 17 12 2
1.4455	30-56*	1.4573	X 10 Cr Ni Ti Mo 18 12
1.4455	30-56*	1.4580	X 6 Cr Ni Mo Nb 17 12 2
1.4455	30-56*	1.4583	X 10 Cr Ni Mo Nb 18 12

*) If weld metal is required to be fully austenitic

Material-No	With wire electrode	Material-No	Materials
1.4455	30-56	1.5662	X 8 Ni 9
1.4455	30-56	1.5637	10 Ni 14
1.4455	30-56	1.5680	12 Ni 19

AMA AP 720 + 30-56: is outstanding for joining unalloyed and low alloy steels to high alloy steels.