StarBlaze Prime 309LMo-15
AWS A5.4: E309LMo-15 | DIN EN ISO 3581-A: E 23 12 2 L B 22
Basic Coated | Mo-Alloyed | High Corrosion and Heat Resistance
StarBlaze Prime 309LMo-15 is a low carbon, basic coated stainless steel electrode with 23Cr-13Ni-2.5Mo alloying, specially designed for welding dissimilar joints between stainless and mild steels. It serves as an ideal intermediate layer for 316L cladding and ensures excellent corrosion and oxidation resistance up to 1000°C. The weld bead is smooth, slag is self-releasing, and arc control is optimized for both initial and re-strike conditions.
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
Key Features
- Excellent interpass welding between stainless and mild steels
- Mo content improves pitting and oxidation resistance
- Smooth, spatter-free welds with soft arc characteristics
- Self-peeling slag and stable arc re-ignition
- High tensile strength (620 N/mm²) and impact value (70 J)
- Corrosion resistant up to 1000°C
Industries
- Chemical processing and refineries
- Food and beverage equipment fabrication
- Power generation and boilers
- Heat exchangers and pressure vessels
- Piping and structural applications involving stainless/mild dissimilar joints
Processes
- Shielded Metal Arc Welding (SMAW / MMA)
- Polarity: DC+
- Current range:
- 2.50 mm: 40–70 A
- 3.15 mm: 70–100 A
- 4.00 mm: 110–150 A
- 5.00 mm: 130–180 A
- Welding positions: 1G/PA, 2F/PB, 2G/PC, 3G/PF, 4G/PE
- Recommended interpass temperature: < 200°C
Additional Details
- Keep electrodes dry to prevent moisture pickup
- Re-drying only if necessary: 250–300°C for 1 hour
- Suitable for cladding applications where high-temperature and corrosion resistance are required
- Ideal for transition layers prior to final 316L overlay
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Ni | Mo | S | P |
| 0.028 | 0.40 | 1.50 | 22.50 | 13.00 | 2.50 | 0.015 | 0.030 |
Typical Mechanical Properties (All Weld Metal)
| Tensile Strength
Rm (N/mm2) |
Elongation
A5 (%) |
Charpy Impact Value
(ISO-V J RT) |
| 620 | 35 | 70 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 40-70 |
| 3.15 | 70-100 |
| 4.00 | 110-150 |
| 5.00 | 130-180 |
