StarBlaze Prime 309-15
AWS A5.4: E309-15 | DIN EN ISO 3581-A: E 23 12 B 22 | Werkstoff Nr: 1.4332
Buffer-Layer Ready, Smooth Fusion, Ideal for Carbon to Stainless Welding
Basic-coated stainless steel electrode with ~15% ferrite, designed for welding dissimilar metals and overlaying high-temperature steels. Suitable for buffer layers before hardfacing and 18/8 cladding. Delivers smooth fusion, easy slag release, and strong impact resistance. Trusted for repair, civil engineering, and fabrication applications.
- 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
- High ferrite content enhances crack resistance in dissimilar welds
- Excellent restrike, soft arc behaviour, and finely rippled weld finish
- Suitable as a first layer before stainless or hard-facing deposits
- Tensile strength: ≥550 N/mm² | Elongation: ≥30%
- Charpy impact energy: ≥60 J
- Compatible base materials: A312 TP 309S, carbon steel to stainless transitions, X12CrNi23-13, 304LN, and other heat-resistant stainless grades
Industries
- Civil engineering and structural repair
- Chemical and thermal plant fabrication
- Hardfacing and buffer layer preparation
- Machine part refurbishment
- Carbon to stainless transition joints
Processes
- Manual Metal Arc Welding (MMA / SMAW)
- DC+ polarity welding
- Buffer-layer and cladding base preparation
- Stainless steel overlays on low alloy or carbon steel
- High-temperature assembly and repair
- Multi-pass joint welding in structural assemblies
- Weld surfacing of pressure-rated parts
Additional Details
- Use case: Buffer-layer welding, cladding, and joining of stainless to carbon steel in critical applications
- Handling: Redry at 300–350°C for 1 hour if exposed to ambient conditions
- Storage: Store in heated holding ovens or sealed packaging to maintain low hydrogen condition
- Limitations: Not recommended for cryogenic service; avoid under severe restraint without proper preheat/interpass control
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Ni | S | P |
| 0.05 | 0.40 | 1.40 | 24.00 | 12.50 | 0.015 | 0.025 |
Typical Mechanical Properties (All Weld Metal)
| Tensile Strength
Rm (N/mm2) |
Elongation
A5 (%) |
Charpy Impact Value
(ISO-V(J) RT) |
| ≥ 550 | ≥ 30 | ≥ 60 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 50-70 |
| 3.15 | 70-100 |
| 4.00 | 110-140 |
| 5.00 | 140-160 |
