StarBlaze Prime 385
AWS A5.4: E385-16 | DIN EN ISO 3581-A: E 20 25 5 Cu N L R 12
Rutile Basic | Austenitic | Cu–Mo Alloyed | Acid-Resistant & Stress Corrosion Resistant
StarBlaze Prime 385 is a rutile-basic coated electrode designed for welding fully austenitic, highly corrosion-resistant stainless steels such as 904L and B6. It offers excellent weldability in all positions with a stable arc and smooth slag detachment. The weld metal is resistant to chloride-induced stress corrosion and attacks from phosphoric and sulphuric acids due to its high Mo, Cu, and Ni content. Weld bead appearance is finely rippled and low spatter.
- Available Packs
- Dimensions: 2.50 mm x 350 mm, 3.15 mm x 450 mm, 4.00 mm x 450 mm, 5.00 mm x 450 mm
- Pack Sizes: 2.5 Kg Pouch, 5 Kg Box
- Master Box: 20 Kg, 30 Kg, 40 Kg, Customisable packaging available on request
- Fully austenitic weld metal, no delta ferrite
- Excellent resistance to pitting, crevice corrosion, and chloride attack
- Alloyed with 25% Ni, 20.5% Cr, 4.5% Mo, 1.5% Cu
- Mechanical properties: ≥570 N/mm² tensile, ≥90 J impact
- Smooth arc, minimal spatter, stable bead profile
- Suitable for welding dissimilar and high-alloy steels in corrosive media
- Pulp and paper processing
- Chemical storage and transport vessels
- Marine and desalination applications
- High-purity and high-acid containment systems
- Installations in sulphuric/phosphoric acid service
- Shielded Metal Arc Welding (SMAW / MMA)
- Polarity: AC or DC
- Current range:
- 2.50 mm: 50–80 A
- 3.15 mm: 80–110 A
- 4.00 mm: 100–150 A
- 5.00 mm: 150–180 A
- Welding positions: 1G/PA, 2F/PB, 2G/PC, 3G/PF, 4G/PE
- Re-dry at 300–350°C for 2 hours if required
- Fully austenitic structure for superior corrosion performance
- Matches base materials like 1.4539, 1.4537, 1.4583, and others used in chemical and process industries
- Not suitable where delta ferrite is required for crack resistance
Product Details
Typical Weld Metal Chemical Composition (%)
| C | M | Si | Ni | Cr | Mo | Cu | P | S | Structure |
| < 0.03 | 1.00 | 0.80 | 25.00 | 20.50 | 4.50 | 1.50 | 0.020 | 0.010 | Austenite |
Typical Mechanical Properties (All Weld Metal)
| Yield Strength Rp (N/mm2) | Tensile Strength Rm (N/mm2) | Elongation A5 (%) | Charpy Impact Value ISO-V J RT |
| ≥ 370 | ≥ 570 | ≥ 35 | ≥ 90 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 50-80 |
| 3.15 | 80-110 |
| 4.00 | 100-150 |
| 5.00 | 150-180 |
