OK 68.81
SMAW
Type Rutile-acid

OK 68.81 is a high-alloyed electrode which deposits a ferritic-austenitic duplex weld metal with approx. 40% ferrite. Resistant to stress corrosion and highly insensitive to dilution. Good scaling resistance up to 1150C. OK 68.81 is used for joining dissimilar steels, steels with reduced weldability and buffer layers prior to hardfacing. Applications: rolls, forging dies, hot-work tools, dies for plastics and so on.
Welding current, A
DC+, AC OCV 60 V


ClassificationsApprovalsTypical all weld metal compositionTypical properties all weld metal
SFA/AWS A5.4
E312-17
EN 1600
E 29 9 R 3 2
Werkstoff Nr.
1.4337
C0,12
Si0,7
Mn0,8
Cr29,0
Ni9,8
Mo<0,5
Cu<0,3
Redrying temperature, C
350
Redrying time, hours
2
Yield stress, MPa
610
Tensile strength, MPa
790
Elongation, %
22
Elongation, %
22
Ferrite content
FN 50-80
Weld metal hardness, a w
220-240 HV
Machinability
Fair
Charpy V
Test temps, CImpact values, J
+2030

Diameter, mm2,02,53,24,05,0
Length, mm 300 300 350 350 350
Arc voltage, V 22 24 25 26 28
Welding current, A 40-60 50-85 60-125 80-175 150-240
N. Kg weld metal/kg electrodes 0,64 0,64 0,62 0,62 0,65
B. No. of electrodes/kg weld metal 123,0 78,0 42,0 26,0 16,5
H. Kg weld metal/hour arc time 0,7 0,9 1,3 2,0 3,2
T. Burn-off time, secs/electrode 41 48 65 66 68

 

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