B77 VAC
Basic electrode with high strength
Description & applications
Basic electrode with a deposit which is very resistant to cracks and has a high strength. Steel deposit containing Ni, Cr, Mo, Mn for welding similar fine grain steels (service temperatures: -40 to +450°C). Example: tempered coated steels, low alloyed, pressure vessels.
Very good radiographic quality - very low diffusible hydrogen (< 3 ml H2/100g metal deposit) - pleasant fusion - stable arc - low spatters - good removal of the slag.
Fine grain and cold tough steels :
NF A 36-204 : E 500T*. E 620 T*. E 690T*.
DIN 17102 :Ste590*. Ste690*. Tste 500*. Wste 500*.
17 MnCrMo 33, 11 NiMnCrMo 55, 16 NiCrMo 12, 12MnNiMo 55.
Werkstoff Nr : 1.8928* - 1.7279* - 1.6780* - 1.6782* - 1.6343*...
ASTM : A517 - A533 GrA - A537 - A678 - A633 Gr C à E.
N-A-XTRA ; N-A-XTRA 70* (Thyssen).
Tubes aciers : API 5 LX : X70*, X75*, X80*.
(*) with eventual pre- and post weld heat treatment (consult us).
Classification
| NFA 81-340 | AWS A 5.5 | DIN 8529 | EN ISO 18275-A |
|---|---|---|---|
| EY 69 Mn2NiCrMo B110 20 BH | E 11018-M | EY 6976 Mn2 NiCrMo BH5 20+ | E 69 4 Mn2NiCrMo B 4 2 H5 |
Typical weld metal composition (%)
| C | Mn | Si | Ni | Cr | Mo |
|---|---|---|---|---|---|
| <0.1 | 1.5 | 0.4 | 2.1 | 0.4 | 0.5 |
All weld metal mechanical properties
| Rm (MPa) | Rp0.2 (MPa) | A5 (%) | Av - ISO - V |
|---|---|---|---|
| >760 | >680 | >20 | + 20°C >120 ; - 40°C > 60 |
Packaging data
| Dimension | 2.5x350 | 3.2x350 | 4.0x450 | 5.0x450 |
|---|---|---|---|---|
| Electr. / packet | 244 | 143 | 96 | 64 |
| Electr. / carton | 976 | 572 | 384 | 256 |
| Kg 1000 electr. | 20.5 | 35 | 68 | 102 |
| Packets / carton | 4 | 4 | 4 | 4 |
| Kg / packet | 5 | 5 | 6.5 | 6.5 |
| Kg / carton | 20 | 20 | 26 | 26 |
Amperes
| A | 80 | 115 | 150 | 190 |
|---|
Welding Instructions
Vacuum pack so no need to redry the electrodes! You have to redry them 24h after opening the pack.
Redrying at 350 °C during 2 hours. Eventual preheating of the base metal depends on the thickness and the nature of the steel (50 to 130°C). Maintain an interpass temperature <150°C.
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