StarBlaze Prime 309L-15
AWS A5.4: E309L-15 | DIN EN 1600: E 23 12 L B 12 | DIN 8556: E 23 12 LB 23 | Werkstoff Nr: 1.4332
Low Carbon, Buffer-Layer Ready, Excellent Arc with Ferrite Balance
Low carbon, basic-coated stainless electrode with ~15% ferrite for welding dissimilar metals (carbon to stainless), high-temperature steels, and as a buffer layer before hardfacing. Offers smooth fusion, refined bead appearance, and reliable slag release for civil engineering, cladding, and structural repairs.
- 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
- Low carbon for reduced sensitisation risk and ferrite-enhanced stability
- Excellent crack resistance and smooth, slag-free bead
- Suitable for buffer welding and stainless-to-mild steel transitions
- Tensile strength: ≥550 N/mm² | Elongation: ≥30%
- Charpy impact energy: ≥60 J at 20°C
Compatible base materials: 309, 304LN, 3098, A312 TP 309S, UGINOX R20-12, R24-13S
Industries
- Structural fabrication for dissimilar steel joints
- Civil and infrastructural repair welding
- Buffer layers in hardfacing applications
- Heat exchanger and pipeline installations
- Power and chemical process plant components
Processes
- Manual Metal Arc Welding (MMA / SMAW)
- DC+ compatible welding
- Dissimilar metal joining (carbon to stainless)
- Buffer weld layer before overlay/hardfacing
- Multi-pass welds in temperature-variable environments
- First-layer deposition on 18/8 cladding applications
- Positional stainless welding with clean finish
Additional Details
- Use case: Welding low carbon stainless steels to dissimilar materials in pressure vessels, tanks, and piping
- Handling: Redry at 250–300°C for 1 hour if exposed to ambient conditions
- Storage: Keep electrodes sealed or stored in heated cabinets to avoid moisture pickup
- Limitations: Not recommended for root passes or single-layer surfacing without proper joint design
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Ni | Mo | S | P |
| 0.025 | 0.40 | 1.60 | 24.00 | 13.00 | 0.10 | 0.020 | 0.025 |
Typical Mechanical Properties (All Weld Metal)
| Tensile Strength
Rm (N/mm2) |
Elongation
A5 (%) |
Impact
ISO-V (J) RT 20°C |
| ≥ 550 | ≥ 30 | ≥ 60 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 50-70 |
| 3.15 | 70-110 |
| 4.00 | 110-140 |
| 5.00 | 140-160 |
