QuFe55 Bobbin – Laser Welding Wire Stainless 1.4551 / ER347Si – Nb-Stabilised, Heat Resistant
€116.62
QuFe55 Bobbin – Laser Welding Wire Stainless 1.4551 / ER347Si – Nb-Stabilised, Heat Resistant
QuFe55 is the niobium-stabilised 18/8 austenite for apparatus and piping construction: 1.4551 · ER347Si (19 9 Nb Si).
The difference from ER308LSi is the niobium: it ties up the carbon as niobium carbide before chromium carbide can form. The weld metal therefore stays resistant to intergranular corrosion even under prolonged heat — which is why stabilised austenites are used wherever the plant runs hot in service, not just during welding.
Recommended base materials
- 1.4301, 1.4303, 1.4306 — austenitic CrNi standard grades
- 1.4310, 1.4319 — high-strength CrNi spring steels
- 1.4541 — X6CrNiTi18-10 / AISI 321 (Ti-stabilized)
- 1.4550, 1.4552 — X6CrNiNb18-10 / AISI 347 (Nb-stabilized)
Typical applications
- Apparatus and piping construction
- Plants with elevated operating temperature
- Components in stabilised CrNi steels (1.4541, 1.4550)
- Repair welding without solution annealing
Advantages of 1.4551 / ER347Si
- Niobium stabilization prevents intergranular corrosion at weld seams
- Stainless, IGC-resistant in wet corrosion up to 400 °C
- Weldable without subsequent solution annealing
- Weld metal: yield 390 MPa, tensile 590 MPa, elongation 30 %
Bobbin form: K125, K80, MA125, SH253 — wire weight 100 g–500 g, Ø 0,2 mm – 0,8 mm.
Material analysis (wt.-%)
C 0.06 | Si 0.90 | Mn 1.3 | Cr 20.0 | Ni 9.5 | Nb 12×C | Fe balance
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| Bobbin size: | K80, K125, MA125, SH253 |
|---|---|
| Bobbin weight: | 100 g, 200 g, 500 g |
| Diameter: | 0,2 mm, 0,3 mm, 0,4 mm, 0,5 mm, 0,6 mm, 0,8 mm |
| Recommendations for basis material: | 1.4301, 1.4303, 1.4306, 1.4310, 1.4319, 1.4541, 1.4550, 1.4551, 1.4552 |
| Wire: | Laser welding wire |
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