Abstract: A cored wire (1; 100) intended to be injected into a molten metal bath to perform metallurgical treatment, the cored wire comprising: a fill (2) extending locally along a longitudinal axis (L), the fill comprising at least one active substance to treat the molten metal; and an outer sheath (4) extending longitudinally around the fill, characterized in that the fill comprises: an extruded bar (8) extending longitudinally and comprising the active substance; and an intermediate layer (10) extending longitudinally between the extruded bar and the outer sheath and comprising a powder containing one or more from among: a metal, a mixture of metals, a metal oxide, a mixture of metal oxides.

Abstract: A cored wire for introducing additive into a bath of liquid steel, of the type comprising a metal sheath surrounding said additive, characterized in that said additive predominantly comprises calcium silicate. A process for manufacturing a resulfurized steel, characterized in that it comprises a step of introducing, into the bath of liquid steel, such a cored wire.

Abstract: A method for introducing a cored wire into a bath of molten metal includes extracting the cored wire from a reel, and making it run into the molten metal bath, one part of the path traveled by the cored wire being formed in a guide tube with a distal end at a defined height above the metal bath's surface. The cored wire is driven and straightened under conditions practically not altering its substantially circular cross section and allowing it to be vertically introduced and penetrate into the depth of the bath. Elements for driving the cored wire from a reel, a guide tube for guiding the cored wire, and elements for straightening the cored wire are placed in front of its entry into the guide tube, the straightening elements giving the cored wire a straight direction without altering its circular cross section.

Abstract: Powder which is for a flux-cored wire intended to become alloyed with a molten metal bath and which is formed by particles composed with at least 95% of sulphur, characterised in that its granulometric population is defined by: ?1 ?m?d10?340 ?m; ?200 ?m d50?2000 ?m; ?500 ?m d90?2900 ?m. Sulphur-based flux-cored wire, characterised in that it contains the preceding powder, and in that the compaction rate of the powder within the wire is greater than or equal to 85%. Method for producing a sulphur-based flux-cored wire for alloying with molten metal baths.

Abstract: Cored wire including at least one thermal barrier layer, distinguished by the fact that said layer is made of a material that pyrolizes upon contact with a metal bath such as liquid metal.

Abstract: An end-piece for an additive guide tube is disclosed. Such an end piece may have a durable sleeve and a sloughable sleeve. The sloughable sleeve may have a channel through which an additive may be delivered, and the sloughable sleeve may reside in the through-hole of the durable sleeve and may be secured to the durable sleeve. When molten metal contacts the sloughable sleeve, the sloughable sleeve burns or melts and sloughs off, thereby preventing the molten metal and slag from sticking to the end-piece, which in turn prevents buildup of metal and slag.

Abstract: Powder which is for a flux-cored wire intended to become alloyed with a molten metal bath and which is formed by particles composed with at least 95% of sulphur, characterised in that its granulometric population is defined by: —1 ?m?d10?340 ?m; —200 ?m d50?2000 ?m; —500 ?m d90?2900 ?m. Sulphur-based flux-cored wire, characterised in that it contains the preceding powder, and in that the compaction rate of the powder within the wire is greater than or equal to 85%. Method for producing a sulphur-based flux-cored wire for alloying with molten metal baths.

Abstract: 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 ?m and 500 ?m and the particle size fraction GR has the following characteristics: —through a 200 ?m sieve: GR<5%; —through a 300 & ?m sieve: 90% 3GR3 10%; —through a 400 ?m sieve: 40% £ GR<100%; —through a 500 ?m sieve: 100% 3GR3 90%.

Abstract: A method for introducing a cored wire into a bath of molten metal includes extracting the cored wire from a reel, and making it run into the molten metal bath, one part of the path traveled by the cored wire being formed in a guide tube, whose distal end is at a defined height above the surface of the metal bath. The cored wire is driven and subjected to a straightening operation under conditions practically not altering its substantially circular cross section and allowing it to be introduced and penetrate into the depth of the bath in a vertical direction. The installation includes elements for driving the cored wire from a reel, a guide tube for guiding the cored wire, and elements for straightening the cored wire that are placed in front of its entry into the guide tube, the straightening elements being capable of giving the cored wire a straight direction without altering its circular cross section.

Abstract: The invention relates to a cored wire for introducing additives into a molten metal bath comprising a metallic sheath (5) containing an additive (6), which metallic sheath is covered by a wrapping (7) which, being combustible without leaving harmful residues, momentarily retards the propagation of heat to the core of the cored wire, this cored wire being characterized in that on top of this combustible wrapping, a protective metallic casing encloses the assembly thus constituted by the additive, the metallic sheath and the combustible wrapping.

Abstract: The invention concerns an agent for treating metal melts in the form of a cored wire comprising a metallic sheath of steel or iron and a filling which contains a compound that splits off gas at the temperature of the metal melt and is based on an organic polymer in amounts of 0.2 to 20 g per meter cored wire. The invention also concerns the use of the agent for homogenizing, refining and homogeneously cooling as well as alloying metal melts.

Abstract: The method concerns the desulphurization of cast iron produced by a blast furnace, before it is converted to steel.In a first phase of the process the cast iron is treated with a desulphurizing compound such as Na.sub.2 CO.sub.3. A very long composite product with a tubular skin is then added to the cast iron. The product comprises an axial zone containing magnesium in powdered or granular form, and an annular zone, separated from the axial zone by an intermediate wall and containing a powdered or granular material. An inert gas could then be injected and a clearing operation carried out.

Abstract: The invention relates to a composite product of substantial length for the treatment of metal baths which is formed by a tubular metal casing (2) within which are housed the treatment material or materials in powder form and which comprises an axial zone (4) containing a first material surrounded by a tubular metal intermediate wall (3) and an annular zone (6) between the casing and the intermediate wall and which also contains a second material.Such a composite product in which the axial zone contains at least one element selected from calcium and magnesium can be used in particular for the desulphurization of iron or steel baths.