StarBlaze Prime 347-15
AWS A5.4: E347-15 | EN ISO 3581-A: E 19 9 Nb B 22 | DIN EN 1600: E 19 9 Nb B 22 | Werkstoff Nr: 1.4551
Basic Coated | Nb-Stabilized Austenitic | For Cryogenic and High-Temperature Stainless Applications
StarBlaze Prime 347-15 is a basic-coated, niobium-stabilized stainless steel electrode designed for welding austenitic stainless steels where resistance to intergranular corrosion and thermal fatigue is critical. With approx. 4–8% ferrite and 0.45% Nb in the weld deposit, it is ideal for applications involving cryogenic temperatures or long-term exposure up to 800°C. Delivers a clean bead with soft arc, low spatter, and easy slag removal.
- Available Packs
- Dimensions: 2.50 mm x 350 mm, 3.15 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 , Vacuum-packed to reduce moisture pickup
- Niobium-stabilized deposit prevents carbide precipitation and sensitization
- Excellent mechanical toughness even at cryogenic temperatures (47 J at -60°C)
- Typical tensile strength: ≥590 N/mm²; elongation: ≥35%
- Weld metal chemistry: 19.0% Cr, 10.0% Ni, 0.45% Nb
- Stable arc, soft fusion, ripple-free bead, and easy restrike
- Ideal for joining both stabilized and unstabilized austenitic stainless steels
- Cryogenic storage and liquefied gas systems
- Power generation and heat recovery piping
- Petrochemical and fertilizer plants
- Food and beverage equipment
- Alloy steel cladding and tube sheet fabrication
- Shielded Metal Arc Welding (SMAW / MMA)
- Polarity: DC+
- Current range:
- 2.50 mm: 50–70 A
- 3.15 mm: 70–100 A
- 4.00 mm: 110–140 A
- 5.00 mm: 140–170 A
- Welding positions: 1G/PA, 2F/PB, 2G/PC, 3G/PF, 4G/PE
- Interpass temperature: <150°C
- Re-dry at 300–350°C for 1 hour only if exposed to moisture
- Compatible with 304, 304L, 321, 347 stainless and equivalent UGINOX grades
- Suitable for thermal cycling and non-scaling environments
- Provides excellent metallurgical integrity under both low and elevated temperatures
Product Details
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Ni | S | P | Nb |
| 0.04 | 0.50 | 1.40 | 19.0 | 10.00 | 0.015 | 0.020 | 0.45 |
Typical Mechanical Properties (All Weld Metal)
| Yield Strength
Rp (N/mm2) |
Tensile Strength
Rm (N/mm2) |
Elongation
A5 (%) |
Charpy Impact Value
(ISO-V J -60°C) |
| ≥ 450 | ≥ 590 | ≥ 35 | ≥ 47 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 50-70 |
| 3.15 | 70-100 |
| 4.00 | 110-140 |
| 5.00 | 140-170 |
