saw-fluxes

AMA OP121TT

  • SA FB 1 55 AC H5 EN 760:
  • B FB 1 55 AC 10MHP5 DIN 32 522:
  • F8A8-EA4 F8A8-EF1 F8A8-EH12K F7A5-EM12 F8P8-EA4 F8A2-EB2 F7P8-EH12K F7A5-EM12K F8P2-EB2 F8A8-EH14 F8A4-EA2 F7A6-EM13K F9A8-EF1 F7P5-EA2 F7P6-EM13K AWS/ASME:
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Type/ Characteristics:

Agglomerated fluoride-basic type flux, preferably used for high strength fine grain structural steels, as well as cryogenic steels and steels resistant to ageing. Owning its neutral behavior as regards pick-up and burn-out of silicon and manganese, wire electrodes having higher percentages of Si and Mn (e.g. 50-27, 50-57) should be used.
AMA-OP121TT is particularly suited for tandem and multi-wire welding. On the strength of COD tests made with, 50-57 wire electrodes, this flux is suitable to be employed for welding offshore components. The weld metal produced in combination with corresponding wire electrodes, meets high toughness requirements at cryogenic temperatures.
AMA-OP121TT produces a short slag, i.e. girth seams of components having a small diameter can be welded without the danger of the slag running off. It produces uniform welds without undercut.
AMA-OP121TT can be used on either DC (positive) or AC up to approximately 1000A.
Damp flux shall be redried by baking at 300°C – 350°C
Grain size according to DIN 32 522:2-20

Main Constituents:

SiO2+TiO2CaO+MgOAl2O3+MnOCaF2
15%40%20%25%

Basicity to boniszewskii: ~3.1

Metallurgical behavior:

Pick-up and burn-off the alloying elements Si and Mn as a function of the alloy content of the wire

electrode, DVS Merkblatt 0907, part 1

All -Weld metal analysis (typical values):

AMA Trade NameDIN/ENCSiMnMoCrNi
50-12S20.05-0.080.15-0.250.7-1.0---
50-15S30.05-0.080.15-0.251.0-1.4---
50-57EH12K0.05-0.080.20-0.401.4-1.9---
50-14S2Mo0.05-0.080.15-0.250.7-1.00.5--
50-17S3Mo0.05-0.080.15-0.251.0-1.40.5--
50-22S2crMo10.05-0.080.20-0.300.7-1.00.51-
50-23S2crMo20.05-0.080.20-0.300.5-0.81.02.2-
50-24S2Ni10.05-0.080.25-0.401.0-1.3--1.0
50-25S2Ni20.05-0.080.20-0.300.7-1.0--2.0
50-25S3Ni1Mo0.05-0.080.20-0.401.3-1.6-0.5-1.0

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

With Wire ElectrodeHeat TreatmentTensile Strength
(N/mm )
Yield Strength
(N/mm )
Elongation
Lo=5d%
50-12As Welded450-550> 360> 28
50-15As Welded530-630> 430> 25
50-57As Welded540-640> 450> 24
50-14As Welded580-680> 500> 20
50-17Tempered(1)600-700> 530> 18
50-22Tempered(1)530-630> 380> 24
50-22Norm+Temp(2)430-530> 310> 30
50-23Tempered(3)550-650> 450> 22
50-23Norm+Temp(4)520-620> 400> 22
50-24As Welded500-600> 420> 24
50-24Stress relived480-580> 380> 26
50-25As Welded550-650> 450> 24
50-25Stress relived500-600> 430> 26
50-21As Welded650-750> 540> 20
50-21Stress relived630-730> 540> 22
Heat TreatmentImpact energy (Joule) ISO -V 20°C       ±0°C       -20°C       -40°C       -60°C         -80°C
50-12As Welded>180      >160       >100            -               -                 -
50-15As Welded>180     >160        >100        >35              -                 -
50-57As Welded>200     >180        >140        >100         >70               -
50-14As Welded>140     >120        >100        >70             >50             -
50-17As - Welded>140     >120        >100        >70             >50             -
50-22Tempered(1)>200     >150            -               -                  -               -
50-22Norm+Temp(2)>200     >200            -               -                 -                -
50-23Tempered(3)>140    >100             -               -                 -                 -
50-23Norm+Temp(4)>140     >90              -               -                 -                 -
50-24As Welded>150     >130        >100         >70            >50             -
50-24Stress relived>170     >140        >110         >90            >70             -
50-25As Welded>160     >140        >120         >100         >70         >50
50-25Stress relived160       >140        >120         >90           >70             -
50-21As Welded>150     >120        >90           >70            >50             -
50-21Stress relived160       >140        >120         >90            >70             -

1)tempered: 700°C -720°C
2)norm+temp: 920°C/air + 700°C -720°C
3)tempered: 730°C -750°C
4)norm+temp: 940°C/air + 730°C -750°C

Application:

MaterialsMulti pass joint welding
Fine grain structural steelsWith wire electrode
StE 255, WStE 25550-12,50-15
StE 285, WStE 28550-12,50-15
StE 315, WStE 31550-12.50-15
StE 355, WStE 35550-12,50-15
StE 380, WStE 38050-15.50-57
StE 420, WStE 42050-15,50-57
StE 460, WStE 46050-57
StE 500, WStE 50050-24(1),50-21(2)
TStE 255, EStE 25550-24,50-15,50-57(3)
TStE 285, EStE 28550-24,50-15,50-57(3)
TStE 315, EStE 31550-24,50-15,50-57(3)
TStE 355, EStE 35550-24,50-15,50-57(3)
TStE 380, EStE 38050-24,50-15,50-57(3)
TStE 420, EStE 42050-24,50-15,50-57(3)
TStE 460, EStE 46050-57
TStE 500, EStE 50050-57(1),50-21(2)
Creep resistant steelsWith wire electrode
15 Mo350-14,50-17
13 Cr Mo4450-22
10 Cr Mo9 1050-23
Cryogenic SteelsWith wire electrode
10 Ni 14(4)50-25
TTSt 35 N, TTSt 35 V50-25
TTSt 41 N, TTSt 41 V50-25
Non-ageing steels-
ASt 35, ASt 4150-15
ASt 45, ASt 5250-15

1)only thinner plates
2)Also for stress-relived condition
3)Observe minimum temperature of -40°C
4)Lowest service temperature -80°C
Approval : LRS

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