AWS A5.5: E8018-B8 | ISO 3580-A: E CrMo9 B 42 H5
+600 °C Operation | Creep-Stable Weld Metal | Hydrogen-Resistant, Quenchable Alloy Core
A premium basic-coated MMA electrode engineered for welding high-pressure, high-temperature CrMo steels, especially 11CrMo9-1 (P9). Delivers low-hydrogen welds with excellent resistance to creep, rupture, and hydrogen attack. Optimised for petrochemical, boiler, and thermal system construction requiring stability up to +600 °C. Weld metal is fully quenchable and temperable, delivering high reliability in extreme conditions.
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Mo | S | P |
| 0.08 | 0.30 | 0.70 | 9.00 | 1.00 | 0.010 | 0.020 |
Typical Mechanical Properties (All Weld Metal)
| Heat Treatment | Yield Strength
Rp (N/mm2) |
Tensile Strength
Rm (N/mm2) |
Elongation
A5 (%) |
Impact Energy
ISO-V (J) +20°C |
| PWHT 740°C x 1hr | > 500 | > 600 | > 20 | > 47 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 60-90 |
| 3.15 | 100-130 |
| 3.20 | 100-130 |
| 4.00 | 140-180 |
| 5.00 | 180-240 |
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