Preparation technology of low-cost titanium alloy ingots
Release time:
Nov 12,2021
Titanium and titanium alloy materials have a wide range of applications in aviation, aerospace, naval, nuclear power and other important fields and petroleum, metallurgy, chemical industry, electric power, biomedical and other civil markets because of their low density, high specific strength, good toughness, non-magnetic, good corrosion resistance and other excellent comprehensive performance.
Titanium and titanium alloy materials have a wide range of applications in aviation, aerospace, naval, nuclear power and other important fields and petroleum, metallurgy, chemical industry, electric power, biomedical and other civil markets because of their low density, high specific strength, good toughness, non-magnetic, good corrosion resistance and other excellent comprehensive performance. But because of its high cost, limiting its further popularization of civil popularization. The new emergence of some new titanium alloy ingot preparation technology can effectively solve this problem, mainly:
1. Development of low-cost titanium alloy
Through alloy design, adding cheap alloying elements (such as Fe) instead of expensive alloying elements (such as V), etc., the development of low-cost titanium alloys to expand the application of titanium alloys. The method is highly feasible, applying low-cost alloying elements to achieve the purpose of cost reduction.
The United States Timet developed Fe as an alloying element of low-cost high-strength titanium alloy Ti-1.5Al-6.8Mo-4.5Fe and automotive titanium Ti-6Al-1.7Fe-0.1Si, the former alloy performance is comparable to Ti-1023, the cost of only 78% of the Ti-6Al-4V; the latter's performance is better than the Ti-6Al-4V, the cost can be reduced by 15% to 20%.
2. Add back to the residue preparation technology
In the production process of titanium alloys, due to melting, forging, hot rolling, cold rolling, tube extrusion process will produce a certain amount of residue, through the residue cleaning, according to the grade classification, you can be block material, chip material in the form of bundles of electrodes with vacuum self-consumption arc furnace (VAR), electron beam cold bed furnace (EBCHM), plasma cold bed furnace (PACHM) melting way back to the application again, residue The maximum recovery rate can be up to 100%.
The price of titanium residue is only 20% to 30% of the price of raw material titanium sponge, by adding the way back to the residue, not only greatly reduce the production cost of some grades of titanium alloys, to meet the market and customer demand, but also for the secondary utilization of residue provides an effective way.
3.New melting method
At present, the international production of large-scale high-quality titanium alloy billet using methods, including the application of new electron beam cold bed furnace, plasma cold bed furnace melting technology, a single cold bed furnace melting direct rolling technology.
The new melting method can partially replace the vacuum self-consumption electric arc furnace melting, from the process to realize the short flow manufacturing technology, eliminating the traditional vacuum self-consumption electric arc furnace melting hydraulic press pressing electrode, vacuum welding and other processes, but also a large number of recycling residual material. The application of cold bed furnace melting technology not only improves the quality of titanium and titanium alloy ingots, but also reduces the cost, especially if a single cold bed furnace technology melting titanium alloy, direct melting and casting of flat ingots, the processing cost can be saved 10% to 20%.
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