OK 68.55
SMAW
Type Basic

OK 68.55 is a coated electrode for welding austenite ferrite steels of Super Duplex type, e.g. SAF 2507 and Zeron 100. OK 68.55 deposits a weld metal with high ductility.
Welding current, A
DC+


ClassificationsApprovalsTypical all weld metal compositionTypical properties all weld metal
EN 1600
E 25 9 4 N L B 4 2
Werkstoff Nr.
(1.4410)
C<0,04
Si0,5
Mn0,8
Cr25,3
Ni9,8
Mo4,0
N0,25
Redrying temperature, C
250
Redrying time, hours
2
Recovery
107-109
Yield stress, MPa
700
Tensile strength, MPa
900
Elongation, %
28
Elongation, %
28
Ferrite content
FN 35-50
Charpy V
Test temps, CImpact values, J
+2090
-2070
-4055
-6045

Diameter, mm2,53,24,0
Length, mm 300 350 350
Arc voltage, V 23 23 23
Welding current, A 50-80 60-100 100-140
N. Kg weld metal/kg electrodes 0,62 0,63 0,62
B. No. of electrodes/kg weld metal 93 46 32
H. Kg weld metal/hour arc time 0,8 1,10 1,60
T. Burn-off time, secs/electrode 48 68 70

 

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