STARBLAZE PRIME 318
AWS A5.4: E318-16 | DIN EN ISO 3581-A: E 19 12 3 Nb R 12 | DIN EN 1600: E 19 12 3 Nb R 12 | Werkstoff Nr: 1.4576
Rutile Coated | Nb-Stabilized Austenitic | General Purpose for Elevated Temperature Welding
StarBlaze Prime 318 is a rutile-basic MMA electrode developed for welding stabilized austenitic Cr-Ni-Mo stainless steels and cast steels containing niobium or titanium. It provides a stable arc, ripple-free bead, and easy slag removal, making it suitable for both structural and pressure applications operating up to +400°C. Its balanced chemistry with Nb addition ensures excellent corrosion resistance and prevents carbide precipitation in high-temperature zones.
Available Packs
2.50 mm – 5 kg box
3.15 mm – 5 kg box
4.00 mm – 5 kg box
5.00 mm – 5 kg box
Vacuum sealed for low moisture pick-up
- Nb-stabilized weld metal for intergranular corrosion protection
- Typical mechanical properties: 590 N/mm² tensile strength, 35% elongation, 65 J impact
- Weld deposit with 18.5% Cr, 12.0% Ni, 2.6% Mo, and 0.40% Nb
- Austenitic structure with approx. 8% ferrite improves crack resistance
- Low spatter and finely rippled bead for clean finish
- Suitable for joining and cladding stabilized and corrosion-resistant stainless steels
Fertilizer and chemical process plants
Heat exchanger and steam boiler assembly
Pharmaceutical and food-grade fabrication
Refinery pipeline welding and maintenance
Cast stainless steel repair and overlay
- Shielded Metal Arc Welding (SMAW / MMA)
- Polarity: AC or DC
- Current range:
- 2.50 mm: 50–80 A
- 3.15 mm: 70–110 A
- 4.00 mm: 110–150 A
- 5.00 mm: 150–180 A
- Welding positions: 1G/PA, 2F/PB, 2G/PC, 3G/PF, 4G/PE
- Keep dry; re-dry at 300–350°C for 1 hour if required (up to 3 times)
- Ideal for stabilized stainless steels such as 1.4571, 1.4581, 1.4583
- Prevents sensitization and ensures long-term corrosion resistance
- Suitable for both structural and clad welding in pressure applications
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Mn | Si | S | P | Cr | Ni | Mo | Nb | Ferrite |
| 0.03 | 0.80 | 0.90 | 0.010 | 0.020 | 18.50 | 12.00 | 2.60 | 0.40 | Austenite with Approx. 8% Ferrite |
Typical Mechanical Properties (All Weld Metal)
| Yield Strength Rp (N/mm2) | Tensile Strength Rm (N/mm2) | Elongation A5 (%) | Charpy Impact Value (ISO-V J +20°C) |
| 450 | 590 | 35 | 65 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 50-80 |
| 3.15 | 70-110 |
| 4.00 | 110-150 |
| 5.00 | 150-180 |
