StarBlaze Prime 7018H4R
AWS A5.1: E7018 H4R | DIN EN ISO 2560-A: E 42 4 B 42 H5
H4R Certified | -40 °C Toughness | Radiographic Pipe-Ready Welds
An iron powder, low hydrogen basic electrode with H4R moisture-resistant classification—designed for reliable welding of C-Mn microlow and low-alloy steels under structural and offshore conditions. Offers ultra-smooth bead formation, excellent impact performance at sub-zero temperatures, and strong re-strike behaviour in all welding positions. Ideal for critical weld joints exposed to dynamic loads or marine environments.
Available Packs:
Dimensions:2.50 mm x 350 mm, 2.40 mm x 350 mm, 3.15 mm x 450 mm, 4.00 mm x 450 mm, 4.80 mm x 450 mm, 5.00 mm x 450 mm
Pack Sizes: 2.5 Kg Pouch, 5 Kg Box
Master Box: 20 Kg, Customisable packaging available on request
- H4R grade – excellent resistance to atmospheric moisture pick-up
- Smooth, finely rippled weld beads with low spatter
- Radiographic-quality welds for pressure and pipe welding
- Crack-resistant joints with excellent sub-zero impact performance
- Suitable for critical structural applications and offshore use
- Certified for use down to –40 °C service temperature
- Offshore Platforms & Vessel Fabrication
- Power Plants & Energy Infrastructure
- Structural Steelwork (bridges, tanks, cranes)
- Shipbuilding and Marine Equipment
- Vehicle and Heavy Equipment Construction
- Manual Metal Arc Welding (MMA / SMAW)
- Compatible with both AC and DC+ polarity
- Suitable for all-position welding including overhead and vertical
- Ideal for pressure pipe welds, fill passes, and final cap layers
- Stable arc and clean slag for multipass structural joints
- Base materials: S(P)235–S(P)420, GP240–GP280, L245–L360
- Low moisture pick-up in humid storage (H4R certified)
- Re-drying not usually needed if stored properly
- If required:
• HD5: 60–90 °C for short drying
• HD510: Re-dry at 250–350 °C for 2 hours, max 5 cycles - Not recommended for short arc or high-speed weaving techniques
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | P | S |
| 0.07 | 0.38 | 1.30 | 0.020 | 0.020 |
Typical Mechanical Properties (All Weld Metal)
| Heat Treatment | Tensile Strength
Rm (N/mm2) |
Yield Strength
Rm (N/mm2) |
Elongation
A5 (%) |
Charpy Impact Value
(ISO-V J -40°C) |
| As Welded | 550-640 | > 450 | 28 | 80 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.40/2.50 | 60-90 |
| 3.15/3.20 | 110-140 |
| 4.00 | 140-190 |
| 4.80 | 180-230 |
| 5.00 | 180-230 |
