STARBLAZE PRIME 312
AWS A5.4: E312-16 | DIN EN ISO 3581-A: E 29 9 R 12
Rutile-Basic Coated | Ferritic-Austenitic | High Strength and Dissimilar Metal Welding
StarBlaze Prime 312 is a high-alloyed, rutile-basic coated stainless steel electrode with approx. 40% ferrite content, designed for dissimilar joint welding, repair work, and high-strength steel applications. The ferritic-austenitic weld metal is corrosion resistant, non-magnetic, and provides superior mechanical strength. Suitable for welding tool steels, die and spring steels, tempered alloys, cast steels, and as a buffer layer prior to hardfacing overlays.
Available Packs (Not Verified)
2.50 mm – 5 kg box
3.15 mm – 5 kg box
4.00 mm – 5 kg box
5.00 mm – 5 kg box
Custom packaging options available
- High Cr-Ni weld metal with 29% Cr and 9.5% Ni
- Excellent strength: ≥800 N/mm² tensile, ≥500 N/mm² yield
- Superior resistance to cracking and thermal cycling
- Ideal for difficult-to-weld and unknown steels
- Smooth arc with spatter-free operation and self-releasing slag
- Works as a buffer layer before hard surfacing
- Tool and die manufacturing
- Steel fabrication and maintenance
- Foundry and heavy machinery repair
- Spring, gear, and press component welding
- General dissimilar joint and emergency repair applications
- Shielded Metal Arc Welding (SMAW / MMA)
- Polarity: AC or DC
- Current range:
- 2.50 mm: 50–80 A
- 3.15 mm: 70–110 A
- 4.00 mm: 100–150 A
- 5.00 mm: 140–190 A
- Welding positions: 1G/PA, 2F/PB, 2G/PC, 3G/PF, 4G/PE
- Interpass temperature: ≤ 200°C
- Preheat only if base material requires it; low heat input preferred
- Re-drying if needed: 300–350°C for 1–2 hours
- Excellent for joining unknown steel grades or alloys with differing thermal properties
- Suitable for both fabrication and maintenance applications
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Ni | S | P |
| 0.10 | 0.90 | 1.0 | 29.0 | 9.50 | 0.010 | 0.015 |
Typical Mechanical Properties (All Weld Metal)
| Yield Strength Rp (N/mm2) | Tensile Strength Rm (N/mm2) | Elongation A5 (%) |
| ≥ 500 | ≥ 800 | ≥ 20 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 50-80 |
| 3.15 | 70-110 |
| 4.00 | 100-150 |
| 5.00 | 140-190 |
