High-strength steels
FERVEO HTS 420B6
covered electrode · stick electrodebasic coatingCatalogue only
AWS class
E 7018-G H4
EN ISO class
E 42 6 1 Ni B 32 H5
Tensile strength (Rm)
530–640 MPa
Recovery
120 %
Classification
| AWS class | E 7018-G H4 |
|---|---|
| EN ISO class | E 42 6 1 Ni B 32 H5 |
Purpose
- Nickel-alloyed, low-hydrogen basic electrode (H4) for high-strength structural steels (AWS E 7018-G H4, EN ISO E 42 6 1 Ni B 32 H5) — the entry step of the FERVEO HTS ladder.
Why it works
A small nickel addition versus a conventional basic electrode improves low-temperature toughness of the deposit without penalizing mechanical strength; the low-hydrogen basic coating keeps diffusible hydrogen under control. It is usable on DC(-) for root-pass welding, with deep penetration especially in the vertical-up position.
Fields of application
- Fabrication of high-strength steel structures and API 5L pipe (grades A-X60), where the welded joint needs good low-temperature toughness.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.06 |
| Mn | 1 |
| Ni | 0.8 |
| Si | 0.5 |
Mechanical properties
| Tensile strength (Rm) | 530–640 MPa |
|---|---|
| Yield strength (Rp0.2) | 460 MPa |
| Elongation (A5) | 22 % |
| Impact energy (KV) | 47 J (−60 °C) |
Process
| Polarity | DC± |
|---|---|
| Positions | PAflatPBhorizontal-verticalPChorizontalPDhorizontal-overheadPEoverheadPFvertical-up |
| Re-drying | 300–350 °C / 2 h |
| Recovery | 120 % |
Sizes and part numbers
| Ø | Length | Current | Request |
|---|---|---|---|
| 2.5 mm | 350 mm | 60–100 A | |
| 3.2 mm | 350 mm | 80–130 A | |
| 4 mm | 350 mm | 120–180 A |
Cross-reference
| Replaces EM 140 (Magmaweld) | Direct replacement |
| Replaces TENACITO 38R (Oerlikon) | Direct replacement |
Equivalence refers to the classification (AWS / EN ISO), not to product identity. In applications with a qualified procedure (WPS), validate the substitution before use.
Base metals
EN 10205: S355J2G3S355JRS355JOS355J2G4S355K2G3S355K2G4ASTM A 572 Gr.50A709Gr.50A678Gr.50A633Gr.DAPI 5L: ABX42X46X52X56X60
Advantages
- Dual polarity DC(+)/DC(-) — the root pass can run on DC(-) with a short arc and deep penetration, especially vertical-up.
- Higher deposit recovery than a conventional basic electrode, with the productivity edge that gives in series production.
Limitations
- For higher mechanical-strength duty, see the upper steps of the FERVEO HTS ladder (460/500/550 and above).