LH 81A1S
High-temperature basic electrode
Product description
Basic low-hydrogen molybdenum electrode for welding steels that have to withstand higher service temperatures than standard C-Mn steels (up to 500°C). Good resistance to hydrogen attack (chemical installations).
Pipes, boilers, etc. Smooth melting, easy slag removal and attractive bead appearance.
Product application instructions
Steels and tubes for boilers and pressure vessels:
NF A 36-206 : 15D3 – 18MD4 – 05
DIN 17155 – 17245 : HI – HIII – GS C 25 – 17 Mn4
17175 – 17102 : 19 Mn5 – 15Mo3 – GS22Mo4
St 35.8 – St 45.8 – 17Mn4 – 19Mn5
15Mo3 – StE 255 – StE 420
BS 1504 Gr 245 – BS 3100 Gr B1 – BS 3606 Gr 243, 245
ASTM A 335 Gr P1 – A352 GrLC1 – A204 GrA and B – A 155 Gr CM 65/70
Classification
| NFA 81-345 | AWS A 5.5 | BS 2496 | EN ISO 3580 | DIN 8575 |
|---|---|---|---|---|
| E Mo B 120 20 BH | E 7018-A1 | Mo BH | E Mo B 20 | E Mo B 20 + |
Chemical analysis (%)
| C | If | Mn | Mo | P | S |
|---|---|---|---|---|---|
| <0.1 | 0.4 | 0.8 | 0.5 | <0.025 | <0.025 |
Mechanical characteristics
| Rm (MPa) | Rp0.2 (MPa) | A5 (%) | Av - ISO - V |
|---|---|---|---|
| >550 | >450 | >22 | + 20°C > 100 |
Why choose this basic electrode?
Vacuum-packed 5 or 6Kg electrode for welding highly stressed steel assemblies (carbon and carbon manganese) (tensile strength up to 510 MPa).
It features excellent mechanical properties, particularly at low temperatures.
