FL 851

Category 
type 
Agglomerated semi-basic low hydrogen SAW flux
applications 
Boiler works, spiral pipes, ship building, structural steel works, tanks and pressure vessels, piston cladding, offshore applications etc..
Properties 

Agglomerated semi-basic flux suitable for carbon alloy steel welding in single and multi-pass technique and in single or multi-wire applications. The weld deposit produced in combination with corresponding sub-arc wires meets outstanding mechanical properties and in particular high toughness at low temperature. Excellent slag removal in fillet and groove (semi-narrow gap) welds even in hot conditions. (Pre heat 250°C) This flux is specially developed to achieve very low content of diffusible hydrogen (< 4ml/100 g weld deposit)
 

Basicity:
Current:
Grain size:
1,7 (according to boniszewski
DC or AC, in single or multi-wires up to 1000 Ampere per wire
2.0-0.28mm (10-60 meshes).

 

classification
EN ISO 
14174: SA AB 1 67 AC H4
DIN 
760: SA AB 167 AC H4
Suitable for 

High-temperature resistant 15 NiCuMoNb5 1.6368 SEW 028 Fine grain structural steels 20 MnMoNi4-5 1.6311 DIN E 17201 11 NiMoV 53 1.6341 SEW 028 17 MnMoV 6-4 1.5403 Fine grain structural steels StE 355 1.0562 EN 10028-3 StE 550 1.8924 EN 10137-2 steels to API-standard X 42, X80 API-STANDARD

approvals 
CE approved
welding positions: 
Flux composition

Al2O3+MnO

TiO2+SiO2

CaO+MgO

CaF2

30

20

30

15

mechanical properties with FL 851

With

RP0,2

Rm

A5

Impact Energy (J) ISO-V

Wire Type

(N/mm2)

(N/mm2)

(%)

-20°C

-40°C

-51°C

-62°C

S2

>420

>510

>24

>120

>60

S2Si

>450

>520

>24

>160

>100

>60

S3Si

>470

>560

>23

>150

>80

>47

S3Si (PWHT)

>420

>520

>24

>140

>70

>47

S2Mo

>500

>590

>22

>90

>40

S2Mo (PWHT)

>470

>560

>22

>70

>30

S2Ni1

>440

>530

>25

>180

>110

>70

S2Ni1 (PWHT)

>400

>490

>26

>200

>120

>50

S3NiMo1

>590

>690

>22

>90

>60

S3NiMo1 (PWHT)

>570

>670

>22

>100

>50

SA CrMo1 (PWHT)

>400

>520

>22

>47

SA Corten

>470

>560

>22

>50

>27

PWHT time and temperature as required for the base metal and thickness.
redrying temperature 
At 300-350ºC for 2 hours to obtain diffusible hydrogen 4 ml/100 g. Max.
Standards for wire and flux combined

Classification acc. EN and AWS:

Wire type

EN 756 (rsg)en 1597-1, type 3

Two run EN 1597-1, type 4

AWS A 5.17 / A 5.23

S2(Si)

EN 756 - S 38 4 FB S2

EN 756 - S-3T 3 FB S2

F7 A6-EM 12 (K)

S3(Si)

EN 756 - S 42 4 FB S3

EN 756 - S 4T 3 FB S3

F8 A6-EH 12 K

S2Mo

EN 756 - S 46 3 FB S2Mo

EN 756 - S 4T 3 F8 S2Mo

F8 P4-EA2-A2

S2Ni1

EN 756 - S 42 6 FB S2Ni1

EN 756 - S 4T 3 FB S2Ni1

F7P8-ENi1-Ni1

S3NiMo1

EN 756 - S 50 3 FB S3Ni1Mo

EN 756 - S 5T 3 FB S3Ni1Mo

F9P4-EF3-F3

packing
15, 20, 25-30 Kg steel buckets / bags