Alloy for a fibre-forming plate
A metal alloy is for use at very high temperature, in particular the metal alloy can be used in a process for the manufacture of mineral wool by fiberizing a molten mineral composition. The metal alloy contains the following elements, the proportions being shown as percentage by weight of the alloy: Cr 20 to 35% Fe 10 to 25% W 2 to 10% Nb 0.5 to 2.5% Ti 0 to 1% C 0.2 to 1.2% Co less than 5% Si less than 0.9% Mn less than 0.9% the remainder consisting of nickel and unavoidable impurities.
1. An alloy, consisting of, as percentage by weight of the alloy:
Cr
20 to 35%;
Fe
10 to 25%;
W
2 to 10%;
Nb
0.5 to 2.5%;
Ti
0 to 1%;
C
0.2 to 1.2%;
Co
less than 5%;
Si
less than 0.9%;
Mn
less than 0.9%;
nickel; and
unavoidable impurities.
2. The alloy of claim 1 , comprising less than 0.5% by weight of Ti.
3. The alloy of claim 1 , comprising no titanium other than in the form of unavoidable impurities.
4. The alloy of claim 1 , comprising between 0.7% and 1% by weight of carbon.
5. The alloy of claim 1 , having a (Nb+Ti)/C ratio is from 1 to 2.
6. The alloy of claim 1 , comprising between 22 and 30% by weight of the chromium.
7. The alloy of claim 1 , comprising between 15 and 20% by weight of the iron.
8. The alloy of claim 1 , comprising from 0.5 to 2.0% by weight of niobium.
9. The alloy of claim 1 , comprising from 3 to 9% by weight of tungsten.
10. The alloy of claim 1 , wherein the alloy comprises less than 3% by weight of cobalt.
11. An article suitable for manufacturing mineral wool comprising the alloy of claim 1 .
12. The article for the manufacture of mineral wool of claim 11 , wherein the alloy is manufactured by founding.
13. The fiberizing spinner of claim 11 , wherein the alloy is manufactured by founding.
14. A fiberizing spinner suitable for manufacturing mineral wool made of the alloy of claim 1 .
15. A process for manufacturing mineral wool by internal centrifugation, comprising:
pouring a flow of a molten mineral material comprising the alloy of claim 1 into a fiberizing spinner including a pierced peripheral band, pierced with a multitude of orifices through which filaments of the molten mineral material escape; and
subsequently drawing the filaments to give wool under the action of a gas,
wherein a temperature of the mineral material in the spinner is at least 1000° C.
16. The alloy of claim 1 , wherein the (Nb+Ti)/C ratio is from 1.5 to 2.
17. The alloy of claim 1 , comprising between 23 and 28% by weight of the chromium.
18. The alloy of claim 1 , comprising from 0.7 to 1.7% by weight of the niobium.
19. The alloy of claim 1 , comprising from 3 to 6% by weight of the tungsten.
20. The alloy of claim 1 , comprising less than 1% by weight of the cobalt.