StarBlaze Prime 309LMo
AWS A5.4: E309LMo-16 | DIN EN ISO 3581-A: E 23 12 2 LR 12
Rutile Coated | Mo-Alloyed | Cracking and Corrosion Resistant
StarBlaze Prime 309LMo is a low carbon rutile-basic type stainless steel electrode alloyed with 23Cr, 13Ni, and 2.5Mo, containing 15–25% ferrite in the weld metal. It is designed for welding AISI 309 and 316L stainless steels, and for dissimilar joints between stainless and mild steels. Commonly used as a buffer layer before 316L cladding or as a universal electrode in maintenance jobs, it offers smooth arc behavior, self-peeling slag, and excellent resistance to cracking, oxidation, and corrosion.
Available Packs
- Dimensions: 2.40 mm x 350 mm, 2.50 mm x 350 mm, 3.15 mm x 450 mm, 3.20 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
- Ferrite-balanced weld metal with enhanced crack resistance
- Excellent slag removal and smooth bead finish
- Suitable for dissimilar joint welding and 316L buffer layers
- Superior corrosion and oxidation resistance
- High tensile strength of 650 N/mm²
- Reliable performance in structural and maintenance applications
- Petrochemical and refinery plants
- Marine and offshore engineering
- Power generation equipment
- Food and beverage processing machinery
- Maintenance welding of stainless/mild steel interfaces
- Shielded Metal Arc Welding (SMAW / MMA)
- Polarity: AC or DC
- Current range:
- 2.50 mm: 50–80 A
- 3.15 mm: 80–110 A
- 3.20 mm: 80–110 A
- 4.00 mm: 100–140 A
- 5.00 mm: 150–180 A
- Welding positions: 1G/PA, 2F/PB, 2G/PC, 3G/PF, 4G/PE
- Interpass temperature: < 200°C
- Keep dry; redrying not usually required
- If needed, re-dry at 300–350°C for 1 hour
- Recommended for buffer layers prior to stainless overlays and general purpose dissimilar metal joining
- High ferrite content improves operational safety under thermal cycling
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Ni | Mo | S | P |
| 0.03 | 0.90 | 1.00 | 23.50 | 13.00 | 2.50 | 0.012 | 0.015 |
Typical Mechanical Properties (All Weld Metal)
| Tensile Strength
Rm (N/mm2) |
Elongation
A5, (%) |
Charpy Impact Value
(ISO-V J RT) |
| 650 | 36 | 70 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 50-80 |
| 3.15 | 80-110 |
| 3.20 | 80-110 |
| 4.00 | 100-140 |
| 5.00 | 150-180 |
