QUE HÀN ESAB OK 74.78

Mã sản phẩm: E9018-D1-2.5

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OK 74.78 is an LMA electrode suitable for welding high tensile steels used in low-temperature applications. Good notch toughness down to -40°C. Very suitable for both the enclosed welding and cladding of rails, when a hardness of about 250 HV is required. The moisture content of the coating is very low, which makes OK 74.78 suitable when preheating cannot be applied.

PHI

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Typical Tensile Properties

ISO As welded
ElongationTensile StrengthYield StrengthStress Relieved TemperatureStress Relieved Testing Time
24 %650 MPa600 MPa--
AWS Stress relieved
ElongationTensile StrengthYield StrengthStress Relieved TemperatureStress Relieved Testing Time
---620 °C1 hr

Typical Charpy V-Notch Properties

ISO As welded
Impact ValueTesting TemperatureStress Relieved Testing TempStress Relieved Testing Time
90 J-40 °C--
70 J-50 °C--
AWS Stress relieved
Impact ValueTesting TemperatureStress Relieved Testing TempStress Relieved Testing Time
--50 °C620 °C1 hr

Typical Weld Metal Analysis %

MnMoCSiNiCr
1.60 %0.35 %0.05 %0.35 %0.03 %0.03 %

Deposition Data

DiameterCurrentDeposition RateFusion time per electrode at 90% I maxkg weld metal/kg electrodesNumber of electrodes/kg weld metalVoltage
6.0 x 450 mm240-340 A3.6 kg/h103 sec0.69 kg1024 V
2.5 x 350 mm75-100 A0.90 kg/h55 sec0.62 kg73.022 V
3.2 x 450 mm105-140 A1.30 kg/h86 sec0.65 kg32.023 V
5.0 x 450 mm190-260 A2.60 kg/h100 sec0.68 kg14.024 V
4.0 x 450 mm140-190 A1.80 kg/h97 sec0.65 kg20.523 V

Approvals:ABS, 3Y H5, CE, EN 13479, DB, 82.039.02, DNV-GL, 3 Y46H5, VdTÜV, 01027
Classifications:SFA/AWS A5.5, E9018-D1, EN ISO 18275-A, E 55 4 MnMo B 3 2 H5

Approvals are based on factory location. Please contact ESAB for more information.

Alloy Type:Low alloyed (0.4 % Mo)
Coating Type:IMPERIAL_Basic covering
Diffusible Hydrogen:< 5.0 ml/100g
Welding Current:AC, DC+