Topcore 745B

Category 
SAW Submerged arc
type 
High- basicity flux-cored wire for submerged-arc welding
applications 
Crane, automobile, equipment and steel construction, pipeline, foundries.
Properties 

Crack resistant weld metal conditioned by the high-basicity slag in combination with very low hydrogen content. Well suited for the economic joining of high strength steels and cryogenic fine grain structural steels with Rp0,2 > 890 MPa (129 ksi). To reach the optimal mechanical properties, the energy absorbed per unit length of weld 15 kJ/cm should not be exceeded. The working temperature should be between 100 °C (212 °F) and 150 °C (302 °F) . As welding flux we recommend our type ST 55

classification
AWS 
A 5.23: ~F12A8-ECG
A 5.23M: ~F83A6-ECG
EN ISO 
26304-A: S 89 4 FB T3Ni2,5Cr1Mo
Suitable for 

TM-pipe steels to StE 890 to S890QL1, X120 high-strength fine grain structural steels (low temp) to StE 960 (StE 1100 to 12 mm) to S960QL1 (S1100).  ASTM: up to A 714, A 709, A 515, A 517

approvals 
CE approved
welding positions: 
Weld metal analysis % (typical)

C

Mn

Si

Cr

Ni

Mo

P

S

0.08

1.6

0.4

1.0

2.2

0.5

0.015

0.015
mechanical properties

Heat

RP0,2

Rm

A5

Impact Energy (J) ISO-V

Hardness

Treatment

(N/mm2)

(N/mm2)

(%)

-20°C

-40°C

-60°C

HRc / HV

AW

>890

940-1180

15

55

40
AW: as welded
redrying temperature 
Not required
welding parameters packing

Welding Parameters

Packing

D (mm)

Voltage (V)

Current (A) DC+

spool type

kg / spool

kg / pallet

2,0

K-415

25

2,4

K-415

25
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