OK 73.68

Mô tả

OK 73.68

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.

 

Classifications:	SFA/AWS A5.5:E8018-C1, EN ISO 2560-A:E 46 6 2Ni B 32 H5
Approvals:	CE EN 13479, Seproz UNA 272580, NAKS/HAKC 2.5-5.0 mm, ABS 3Y400 H5*, ABS E 8018-C1, BV 5Y40M H5*, DNV 5Y H5*, GL 6Y46 H5*, LR 5Y42m H5*, PRS 5Y 42 H5, RS 5Y46M H5*, VdTÜV 01529

* Only up to 4.0 mm. NAKS/HAKC: Valid for lot numbers starting with SB. Approvals are based on factory location. Please contact ESAB for more information.

 

Welding Current:	AC, DC+
Diffusible Hydrogen:	<5.0 ml/100g
Alloy Type:	2.5% Ni
Coating Type:	Lime Basic

 

Typical Tensile Properties
Condition	Yield Strength	Tensile Strength	Elongation
AWS
Stress relieved 1 hr 620 °C	500 MPa	600 MPa	28 %
ISO
As welded	540 MPa	615 MPa	28 %

 

Typical Charpy V-Notch Properties
Condition	Testing Temperature	Impact Value
AWS
Stress relieved 1 hr 620 °C	-60 °C	85 J
ISO
As welded	-60 °C	105 J
As welded	-80 °C	65 J

 

Typical Weld Metal Analysis %
C	Mn	Si	Ni	Cr	Mo
0.05	1	0.35	2.4	0.02	0.01

 

Deposition Data
Diameter	Current	Voltage	kg weld metal/ kg electrodes	Number of electrodes/kg weld metal	Fusion time per electrode at 90% I max	Deposition rate 90% I max
2.5 x 350 mm	70-110 A	23 V	0.62	70.0	55 s	0.90 kg/h
3.2 x 450 mm	105-150 A	23 V	0.62	32.0	81 s	1.40 kg/h
4.0 x 450 mm	140-190 A	23 V	0.65	21.0	88 s	2.00 kg/h
5.0 x 450 mm	190-270 A	27 V	0.65	13.5	104 s	2.50 kg/h