StarBlaze Prime 309 Nb
AWS A5.4: E309Nb-16 | DIN EN ISO 3581-A: E 23 12 Nb R 12
High Temp Resistant, Smooth Arc, Dissimilar Metal Compatible
Rutile-basic coated stainless electrode with 23Cr–12Ni–0.7Nb alloy system, ideal for welding AISI 309Cb steels, claddings, and joining dissimilar metals. Niobium content improves intergranular corrosion resistance and mechanical performance at high temperature (up to +1000°C). Delivers finely rippled bead, spatter-free arc, and self-releasing slag.
- Available Packs
- Dimensions: 2.50 mm x 350 mm, 3.15 mm x 450 mm, 4.00 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
- Strong resistance to chemical corrosion and heat up to +1000°C
- Niobium addition improves stability at elevated service temperatures
- Smooth bead with low spatter and excellent slag detachability
- Tensile strength: 590 N/mm² | Elongation: 40%
- Charpy impact value: 75 J
- Compatible base materials: AISI 309, 309Cb, dissimilar joints to carbon or low alloy steels
Industries
- Petrochemical and chemical handling units
- Pressure vessel and heat-resistant cladding work
- Dissimilar metal joining applications
- High-temperature pipelines and fabrication
- Furnace components and exhaust duct welding
Processes
- Manual Metal Arc Welding (MMA / SMAW)
- DC+ polarity welding
- Joining of stainless to mild steel or low alloy steel
- Cladding buffer layer for corrosion-resistant overlays
- Structural welding with high thermal cycling
- Multi-pass root and cover passes in dissimilar assemblies
- Niobium-stabilised alloy welding under high thermal stress
Additional Details
- Use case: Welding 309Cb stainless steel, dissimilar joints, and corrosion-resistant overlays
- Handling: Redry at 250–300°C for 1 hour if exposed to air for extended periods
- Storage: Maintain in heated or low-humidity storage; reseal if opened
- Limitations: Not suitable for root passes in carbon steel pipe; ensure clean joint preparation for optimum corrosion resistance
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Ni | Nb | S | P |
| 0.04 | 0.90 | 0.90 | 23.10 | 12.80 | 0.75 | 0.010 | 0.020 |
Typical Mechanical Properties (All Weld Metal)
| Tensile Strength
Rm (N/mm2) |
Elongation
A5 (%) |
Charpy Impact Value
ISO-V J RT |
| 590 | 40.00 | 75 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 60-90 |
| 3.15 | 80-110 |
| 4.00 | 110-150 |
| 5.00 | 150-180 |
