OK 76.98

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OK 76.98 is a low-hydrogen electrode for welding modified 9 Cr steels like T91/P91. The electrode is suitable for all-positional welding in pipes and plates. The mechanical properties stated here are after two hours of heat treatment at 750°C.

Typical Charpy V-Notch Properties

Impact Value 37 ft-lb
Impact Value 50 J
Shielding Gas ISO
1391 °F
755 °C
2 hr
Testing Temperature 68 °F
Testing Temperature 20 °C

Typical Tensile Properties

ConditionElongationShielding GasTensile Strength Testing Temperature Testing TimeYield Strength
PWHT21 %ISO820 MPa (119 ksi)755 degC (1391 degF)2 hr720 MPa (104 ksi)

Deposition Data

Current Deposition Rate @ 90% I max Diameter Deposition Efficiency (%) Number of electrodes/kg weld metal Voltage
70-100 A 56 sec 0.9 kg/h (2,0 lb/h) 2.5 x 350.0 mm (0.098 x 13,8 in.) 66 % 71.4 21 V
90-135 A 68 sec 1.2 kg/h (2,6 lb/h) 3.2 x 350.0 mm (1/8 x 13,8 in.) 60 % 45.5 22 V
130-200 A 85 sec 1.9 kg/h (4,2 lb/h) 4.0 x 450.0 mm (5/32 x 17,7 in.) 64 % 22.6 23 V


Classifications EN ISO 3580-A : E CrMo91 B 4 2 H5
SFA/AWS A5.5 : E9015-B91 (nearest)


Approvals CE EN 13479
NAKS/HAKC 2.5-4.0 mm
Seproz UNA 272580
VdTÜV 07687
Approvals are based on factory location. Please contact ESAB for more information.

Consumable Characteristics

Alloy Type Low alloyed (9 % Cr, 1 % Mo + Ni / V / Nb)
Coating Type Basic covering
Diffusible Hydrogen < 5.0 ml/100g
Welding Current DC+

Typical Weld Metal Analysis %

Typical Weld Metal Analysis %
C Cr Mn Mo Nb Ni Si V
0.1 % 9 % 0.8 % 1 % 0.06 % 0.7 % 0.35 % 0.24 %

How to purchase OK 76.98

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Part Numbers and Accessories

Part Numbers : OK 76.98