Device and method for feeding rare earth alloy during continuous casting process

Abstract

The invention provides a device and a method for feeding rare earth alloy during continuous casting process. The method comprises drilling a hole at a shroud wall of a tundish during the molten steel casting process, inserting a joint connected with a metal three-way pipe into the hole, blowing inert gas into the inclined tube of the metal three-way pipe, running the rare earth alloy cored wire under the protection of the inert gas through the metal three-way pipe and the joint, and feeding into the molten steel by a wire feeder. The rare earth fed by the invention is uniformly distributed in the molten steel, the formed small impurities are likely to aggregate and float, the sulfide modification effect is remarkable; the columnar crystal and the segregation region are smaller, so that the molten steel is purified effectively. Synchronously, the roll residue within 1 / 4 range of inner arc of the continuously cast plate blank and the vertical fracture defect of the plate are avoided, the danger of steel leakage during the rare earth feeding process of the crystallizer is absolutely avoided. The addition of the rare earth can be optionally adjusted. In this way, requests of adding rare earth by various continuous casting width-thickness ratio plates and advanced rolling technology are satisfied.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a device and method for adding rare earth alloys into a tundish during continuous casting. Background technique [0002] The role of rare earths in steel and metal materials has attracted increasing attention and has been widely used. This is because adding rare earths to steel has the following effects: 1. Purifying molten steel. Adding rare earth to steel is easy to form large-grained rare earth composite inclusions with low melting point. Such inclusions have a large specific surface tension with molten steel and are easy to float and discharge; The properties, morphology, quantity, size and distribution of carbides and non-metallic inclusions; 3. Microalloying, that is, solid solution, solid solution rare earth can solidify grains and purify grain boundaries, which can not only improve the strength of materials Toughness, but also improve the corrosion resistan...

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Problems solved by technology

But this method also has the following defects: 1. The rare earth addition time is late, the rare earth is not sufficiently diffused in the crystallizer, and there is no kinetic condition that can make the inclusions float, so the rare earth reaction products are mostly left in the steel and 2. The distribution of rare earth and sulfur on the slab section is uneven, which affects the application of this process in high-quality steel products and pure steel; 3. This method has a limit value requirement for the minimum thickness of the continuous casting slab. The application of medium slab will produce defects and lead to the scrapping of steel plate

[0005] So far, there is no record or report about adding rare earth alloys to molten steel through a tundish during continuous casting

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