| 摘要 |
The present invention relates to an additive in the form of flux-cored wire for treating baths of liquid steel with a view to obtaining steels having a high lead content. The additive comprising metallic lead and/or one or more lead alloys according to the invention for treating baths of liquid steel, and is in the form of flex-cored wire composed of a metal sheath and a finely divided filling material, the latter being composed of a powder of metallic lead and/or of lead alloy and of a powder containing a material capable of releasing a gas, which is inert with respect to the liquid steel, at the temperature of the liquid steel bath. Characteristically, the powder of metallic lead and/or of lead alloy includes a particle size fraction GR between 200 μm and 500 μm and the particle size fraction GR has the following characteristics: —through a 200 μm sieve: GR<5%; —through a 300 & μm sieve: 90% 3GR3 10%; —through a 400 μm sieve: 40% £ GR<100%; —through a 500 μm sieve: 100% 3GR3 90%.
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