OK 67.50
SMAW
Type Rutile-acid

OK 67.50 is a rutile-coated electrode for welding ferritic austenitic stainless steels, e.g. UNS S31803. Special applications are welding of pipes with high resistance to stress corrosion up to 300C, the so called Duplex steels. OK 67.50 is particularly suitable for welding duplex cargo tanks.
Welding current, A
DC+, AC OCV 60 V


ClassificationsApprovalsTypical all weld metal compositionTypical properties all weld metal
EN 1600
E 22 9 3 N L R 3 2
SFA/AWS A5.4
E2209-17
Werkstoff Nr.
1.4462
CSA W48
E2209-17
ABSFor welding duplex steels
BV2209
CWBCSA W48
DNVFor duplex SS
GL4462
RINA2209
SeprosUNA 409820
VdTV04368
CEEN 13479
C<0,03
Si0,7
Mn0,9
Cr22,3
Ni9,5
Mo3,0
Cu<0,3
N0,16
Redrying temperature, C
350
Redrying time, hours
2
Recovery
0-108
Yield stress, MPa
660
Tensile strength, MPa
857
Elongation, %
25
Elongation, %
25
Ferrite content
FN 25-40
Charpy V
Test temps, CImpact values, J
+2050
-3041

Diameter, mm2,02,53,24,05,0
Length, mm 300 300 350 350 350
Arc voltage, V 29 27 28 29 30
Welding current, A 30-65 50-90 80-120 100-160 150-220
N. Kg weld metal/kg electrodes 0,55 0,58 0,58 0,58 0,58
B. No. of electrodes/kg weld metal 152 91 47 32 20
H. Kg weld metal/hour arc time 0,7 1,0 1,4 1,9 2,8
T. Burn-off time, secs/electrode 33 38 55 59 64

 

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