Calcium-calcium aluminate core-spun yarn for steel smelting
A technology of cored wire and calcium aluminate, which is applied in the field of metallurgy, can solve problems such as low calcium metal yield, affect steel performance, and not very ideal, and achieve saving metal calcium powder resources, improving utilization rate, and sufficient contact Effect
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Embodiment 1
[0016] In a 150-ton ladle in a steel plant, the steel type is STSC steel, which is cast into thin slabs. After being refined in an LF furnace, calcium metal and calcium aluminate-based pre-melted slag cored wires are directly fed. Its core wire composition is: Ca: 27%, CaO: 37% Al 2 o 3 : 33%, others: 3%, cored wire diameter Φ13mm, wire feeding speed 150m / min, feeding 400m, slab sampling for metallographic analysis, non-metallic inclusions in steel are spherical inclusions containing calcium and titanium , the inclusion size is less than 30μ. After the wire-feeding treatment, the sulfur content in the steel was reduced from 200ppm to 150ppm.
Embodiment 2
[0018] In a 150-ton steel ladle in a steel factory, the steel type is ST12 low-carbon steel, and thin slabs are cast. Slag cored wire. Its powder composition is: Ca: 25%, CaO: 38% Al 2 o 3 : 35%, others: 2%, cored wire diameter Φ13mm, wire feeding speed 180m / min, feeding 450m, slab sampling for metallographic analysis, non-metallic inclusions in steel are spherical composite inclusions containing calcium and titanium The size of inclusions and inclusions are all less than 30μ. After the wire-feeding treatment, the sulfur content in the steel was reduced from 195ppm to 135ppm.
Embodiment 3
[0020] In a 150-ton ladle in a steel plant, the steel type is STSC steel, which is cast into thin slabs. After being refined in an LF furnace, calcium metal and calcium aluminate-based pre-melted slag cored wires are directly fed. Its core wire composition is: Ca: 0%, CaO: 50% Al 2 o 3 : 50%, cored wire diameter Φ13mm, wire feeding speed 150m / min, feeding 400m, billet sampling for metallographic analysis, non-metallic inclusions in steel are spherical inclusions containing calcium and titanium, and the size of the inclusions is less than 30μ. After the wire-feeding treatment, the sulfur content in the steel was reduced from 200ppm to 150ppm.
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