QuNi36 Bobbin – Laser Welding Wire Invar 36 / 1.3990 (FeNi36) – Minimal Thermal Expansion
€216.58
QuNi36 Bobbin – Laser Welding Wire Invar 36 / 1.3990 (FeNi36) – Minimal Thermal Expansion
QuNi36 is Invar: a binary iron-nickel alloy (material no. 1.3990 / ~1.3912, UNS K93600, known as INVAR36® and NILO36®) with an extremely low coefficient of thermal expansion between −250 °C and 200 °C, combined with good ductility and toughness.
That property is delicate: it depends on the carbon and manganese content and on the absence of other impurities. The purity of the filler is therefore no formality here — the wrong wire destroys exactly the property the component was made of Invar for.
Recommended base materials
- 1.3990 / 1.3912 (FeNi36)
- INVAR36®, NILO36® and comparable Invar grades
- UNS K93600
Typical applications
- Moulds for CFRP parts (aerospace)
- Measuring and control instruments, e.g. thermostats
- Plants for liquefied gases (production, storage, transport)
- Satellite construction — frames, brackets, housings for control units
- Bushings for bolted joints between metals of differing expansion
Properties and advantages
- Extremely low thermal expansion between −250 °C and 200 °C
- Good ductility and toughness despite the special alloy
- Cold forming lowers the expansion further
- A staged heat treatment stabilises the expansion coefficient within the desired temperature window
- Weld metal: Re 270 MPa · Rm 490 MPa
Bobbin form: K125, K80, MA125, SH253 — wire weight 100 g–500 g, Ø 0,2 mm – 0,8 mm.
Material analysis (wt.-%)
Ni 35.0–38.0 | C 0.20 | Si 0.50 | Mn 0.6 | Ti 0.5 | Cr 0.5 | Nb 1.0 | P 0.025 | S 0.025 | 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: | 1.3912, 1.3990, Invar qualities , NILO36 |
| Wire: | Laser welding wire |
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