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Cored wire

A sandwich wire, pyrolysis technology, applied in the "sandwich wire" field, can solve the problems of insufficient mechanical strength and rigidity of the sandwich wire, powder deterioration, and no protection.

Inactive Publication Date: 2013-03-06
AFFIVAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0042] Other techniques (edge-to-edge joining, covering, welding) for the closure of the outer strips of the core wire have other disadvantages: too thick sheath which reduces the powder / sheath ratio, risk of powder deterioration during welding
Secondly, the mechanical strength and rigidity of the sandwich wire are very insufficient
[0069] Third, the elevated temperature of ferrosilicon powder relative to liquid metal is practically unprotected
[0074] Among the technical problems that arose during the use of the sandwich wire, some were due to the inability to determine in practice what would happen to the sandwich wire when it was introduced into a molten metal bath such as a ladle at 1600°C caused by
In particular, the following question is a tricky one: what is the shape of the sandwich wire in the weld pool (straight, bent into a U-shape)? At what depth the sandwich wire is destroyed due to melting
In the prior art, there is nothing to be found on this topic, except for some irrelevant and sometimes contradictory information

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0113] first reference figure 1 , which is a schematic diagram of introducing the sandwich wire into the liquid ladle.

[0114] The cored wire (1) is drawn from a cage (2) or reel (3) such as described in the applicant's document FR2703334 and introduced into a wire injection machine (4).

[0115] The wire injection machine (4) introduces the core wire into the curved conduit (5) and passes it from the conduit (5) at a height of about 1.00-1.40 meters above the surface of the molten steel bath (6) contained in the ladle (7). ) lead out the sandwich wire.

[0116] The sandwich wire (1) is thus exposed to three very different thermal environments:

[0117] - the first environment, in which the core wire is inside the conduit;

[0118] - a second environment, located above the molten steel bath, in which the core wire is in direct contact with the surrounding atmosphere;

[0119] - The third environment, which is the steel or liquid metal bath itself.

[0120] The Applicant...

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Abstract

The invention relates to a sandwich wire comprising at least one thermally insulating layer, characterized in that said layer is made of a material which pyrolyzes when in contact with a molten metal bath, such as liquid steel.

Description

technical field [0001] The present application relates to the technical field of tubular sheaths containing compacted powder or granular material, these sandwiched sheaths are used for handling liquid metals, especially steel, and are generally referred to as "sandwiches". Background technique [0002] The introduction of these rods into the liquid metal bath makes it possible in particular to refine, deoxidize, degas, calm and / or change the composition of the bath. [0003] Thus, for example, in the desulfurization of blast furnace pig iron to produce steel, it is known to use 2 Ca or Na 2 CO 3 , CaCO 3 , CaO, MgO sandwich wire. [0004] In addition to other processes such as ladle stirring, powder spraying, CAS (Composition Adjustment Sealed), ladle electric arc furnace, RH (Ruhrstahl Heraeus), slot vacuum, sandwich wire is generally used for secondary smelting of steel. [0005] Sandwich wires are used for desulfurization of pig iron, for obtaining GS pig iron, and f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
CPCC21C7/0056C21C7/00
Inventor A·珀拉莱恩
Owner AFFIVAL INC