StarBlaze Prime 7018S H4R
AWS A5.1: E7018-1 H4R | DIN EN ISO 2560-A: E 42 5 B 42 H5
-50 °C Impact Rated | H4R Moisture Resistance | Tough Beads for Structural Security
A premium basic-coated, iron powder electrode with extremely low moisture pickup (H4R certified), designed for crack-free welding of C-Mn microlow and low-alloy steels. Delivers superior impact toughness down to –50 °C with excellent arc stability and bead appearance in positional welding. Ideal for high-restraint joints, marine environments, and security-critical structural fabrication.
Available Packs
- Dimensions: 2.50 mm x 350 mm, 3.15 mm x 450 mm, 3.20 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
Key Features
- H4R-grade coating – low moisture absorption in humid conditions
- Excellent crack resistance in restraint-prone joints
- Smooth, finely rippled weld beads with stable arc
- Impact toughness of 85 J @ –45 °C and 80 J @ –50 °C
- Radiographic-quality welds for out-of-position and pipe work
- Trusted in structural, offshore, and marine welding applications
Industries
- Offshore Structures & Marine Vessels
- Structural Steel in Security or Dynamic Load Zones
- Pressure Tank and Boiler Fabrication
- Bridges, Piers, and Load-Bearing Infrastructure
- General Fabrication of C-Mn Low-Alloy Components
Processes
- Manual Metal Arc Welding (MMA / SMAW)
- Compatible with AC and DC+ polarity
- All-position welding (PA, PB, PC, PF, PE)
- Suitable for root, fill, and cap passes on structural steel
- Performs reliably in sub-zero and high-moisture conditions
Additional Details
- Base materials: S(P)235–S(P)420, GP240–GP280, L245–L360
- Welds meet ISO-V impact values at both –45 °C and –50 °C
- Re-drying not usually required; if needed, 300–350 °C for 2 hrs
- Ultimate mechanical properties within the 7018-1 classification group
- Not recommended for short arc techniques or excessive weaving
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | P | S |
| 0.07 | 0.35 | 1.50 | 0.020 | 0.020 |
Typical Mechanical Properties (All Weld Metal)
| Heat Treatment | Tensile Strength
Rm (N/mm2) |
Yield Strength
Rp (N/mm2) |
Elongation A5 (%) | Charpy Impact Value
(ISO-V J -45°C) |
Charpy Impact Value
(ISO-V J -50°C) |
| As Welded | 550-640 | > 450 | 28 | 85 | 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 |
