What is the main role of ferrosilicon in the steelmaking process?
Sep 04, 2024
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Ferrosilicon can also be used as an alloying agent in steelmaking. Adding a certain amount of silicon to steel can significantly improve the strength, hardness and elasticity of steel, improve the permeability of steel, and reduce the hysteresis loss of transformer steel. It is widely used in low-alloy structural steel, bonded steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, and is commonly used to manufacture monocrystalline silicon or prepare non-ferrous metal alloys.
Titanium alloy is a kind of all-α titanium alloy, because of its good weldability, corrosion resistance, medium strength and good enough plasticity in the annealed state, the sheet can be cold stamped, suitable for working in the environment below 400 ° C and the presence of etching media, mostly used in the aviation sector of high-temperature structural components and missile warhead skin, conventional weapons and equipment structural parts. As the demand for titanium for aviation grows, the amount of the alloy sheet will also increase. However, due to the poor processing plasticity of TA6 alloy sheet, the processing temperature window is narrow, and is particularly sensitive to the processing temperature, so it is easy to have cracks or serious waves during processing, and the processing is difficult, at present, only a few manufacturers can produce TA6 alloy sheet, and its organization and performance are not publicly reported. The effect of annealing temperature on the microstructure and properties of TA6 alloy sheet obtained under specific rolling process was analyzed, in order to provide reference for heat treatment and further industrial application of TA6 alloy sheet.
A certain proportion of aluminum beans and iron nails were melted three times by vacuum consumable electric arc furnace to produce ingot with diameter of Φ640mm and single weight of 3t. The ingot is forged by 2500t fast forging machine into 200mm×1050mm×1200mm slab. The slab hot rolling is started by 2800mm four-high reversible rolling mill with a rolling thickness of 3.5-4.0mm. After intermediate annealing and surface treatment, the slab is rolled into 3.0mm thick cold-rolled sheet by 1780mm six-high reversible cold rolling mill. The cold-rolled TA6 alloy sheet was annealed in a vacuum heat treatment furnace, and heated to 650, 700, 720, 750, 780, 800, 830℃, respectively, and held for 60 minutes before being air-cooled. The annealed sheet is sampled, the tensile properties are tested on the MST electronic stretcher, the maximum bending Angle is tested on the sheet cold bending machine, and the tissue is observed and graded under a metallographic microscope.
