Cobalt-based alloy with a high resistance at high temperatures, spinner for the production of mineral fibers comprising said alloy and process for the production of mineral fibers which uses such a spinner

A process for producing a spinner for use in the production of mineral fibers, comprising:

• melting under vacuum or in at least partially modified atmosphere, a mixture consisting of the following elements, in percent by weight, based on the total weight of the mixture:
• Niobium (Nb):
• 1-4%;
• Hafnium (Hf):
• 0-0.5%;
• Chromium (Cr):
• 27-29%;
• Nickel (Ni):
• 1-5%;
• Carbon (C):
• 0.3-0.45%;
• Tantalum (Ta):
• 0-2%;
• Titanium (Ti):
• 0-2%;
• Iron (Fe):
• 1-3%;
• Manganese (Mn):
• less than 0.5%;
• Silicon (Si):
• less than 0.3%;
• Zirconium (Zr):
• less than 0.2%;
• and
• the remainder being cobalt (Co) and unavoidable impurities,
• to obtain a melt;
• cooling the melt to a temperature to allow the formation of crystal grains,
• casting the melt in a mold, and obtaining a rough article of manufacture,
• subjecting the rough article of manufacture to a first heat treatment at a first temperature and for a first time period to allow the solubilization of the carbides and then to a second heat treatment at a second temperature lower than said first temperature and for a second time period to allow the precipitation of the carbides,
• cooling the rough article of manufacture subjected to the heat treatments to room temperature, and obtaining the spinner.