ESAB

OK 73.68

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OK 73.68 is a 2.5% nickel-alloyed LMA electrode suitable for the welding of low-alloy steels with impact requirements down to -60°C. The composition of the weld metal is such that good, low-temperature impact properties are obtained, even when welding vertically up. The weld metal of OK 73.68 is also noted for its good corrosion resistance to sea-water and sulphuric acid fumes.


Typical Charpy V-Notch Properties

Impact Value Testing Temperature
as welded iso
105 J (78 ft-lb) -60 degC (-76 degF)
65 J (48 ft-lb) -80 degC (-112 degF)
stress relieved aws
85 J (63 ft-lb) 1 hr 620 degC (1148 degF) -60 degC (-76 degF)

Typical Tensile Properties

Condition As Welded Stress Relieved
Shielding Gas ISO AWS
Tensile Strength 615 MPa (89 ksi) 600 MPa (87 ksi)
Yield Strength 540 MPa (78 ksi) 500 MPa (73 ksi)
Elongation 28 % 28 %
Testing Time 1 hr
Testing Temperature 620 degC (1148 degF)

Deposition Data

Current Deposition Rate @ 90% I max Diameter Deposition Efficiency (%) Number of electrodes/kg weld metal Voltage
70-110 A 55 sec 0.9 kg/h (2,0 lb/h) 2.5 x 350.0 mm (0.098 x 13,8 in.) 62 % 70.0 23 V
105-150 A 81 sec 1.4 kg/h (3,1 lb/h) 3.2 x 450.0 mm (1/8 x 17,7 in.) 62 % 32.0 23 V
140-190 A 88 sec 2.0 kg/h (4,4 lb/h) 4.0 x 450.0 mm (5/32 x 17,7 in.) 65 % 21.0 23 V
190-270 A 104 sec 2.5 kg/h (5,5 lb/h) 5.0 x 450.0 mm (0.197 x 17,7 in.) 65 % 13.5 27 V

Classifications

Classifications SFA/AWS A5.5 : E8018-C1
EN ISO 2560-A : E 46 6 2Ni B 32 H5

Approvals

Approvals ABS E 8018-C1
ABS 3Y400 H5
BV 5Y40M H5
CE EN 13479
DNV-GL 5 Y46H5
LR 5Y42m H5*
NAKS/HAKC 2.5-5.0 mm
PRS 5Y 42 H5
RS 5Y46M H5*
Seproz UNA 272580
VdTÜV 01529
Approvals are based on factory location. Please contact ESAB for more information.

Consumable Characteristics

Alloy Type Low alloyed (2.5 % Ni)
Coating Type Basic covering
Diffusible Hydrogen < 5.0 ml/100g
Welding Current AC, DC+

Typical Weld Metal Analysis %

Typical Weld Metal Analysis %
C Cr Mn Mo Ni Si
0.05 % 0.02 % 1 % 0.01 % 2.4 % 0.35 %
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How to purchase OK 73.68

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Part Numbers and Accessories

Part Numbers : OK 73.68
73682530G0
73682530K0
73683240G0
73684040G0
73685040G0
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