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Preparation method of high speed steel blank and its equipment

A high-speed steel and billet technology, which is applied in the field of high-speed steel billet preparation, achieves the effects of high material yield, uniform and fine as-cast structure, and low preparation cost

Inactive Publication Date: 2006-01-11
BEIJING JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0004] In order to solve the existing problems in the production of high-speed steel slabs in the prior art that both the improvement of the structure and performance of the high-speed steel slab and the reduction of production costs cannot be taken into account, the present invention is based on solidification theory, modern continuous casting theory and alloy rheology theory. Solidification, external force field and adding nucleation accelerator to directly prepare high-speed steel billets; provide a continuous or semi-continuous preparation method and equipment for high-speed steel billets

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  • Preparation method of high speed steel blank and its equipment

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Embodiment Construction

[0041] The present invention will be further described in conjunction with accompanying drawing:

[0042] Firstly, the high-speed steel melt 1 qualified for smelting is poured into the temperature-controlled tundish 2, so that the temperature of the high-speed steel melt is adjusted to 1-5°C above the alloy liquidus temperature, and then the high-speed steel melt is continuously poured into the already In the preheated pre-crystallizer 4, the agitation or vibration device and the temperature adjustment device of the pre-crystallizer 4 are turned on at the same time to promote the free austenite formed on the inner wall of the pre-crystallizer 4 and the spheroidization of free grains, and to control the melt The cooling rate and temperature gradient inhibit dendrite growth. The high-speed steel solid-liquid mixture that reaches the lower port of the pre-crystallizer 4 flows into the final crystallizer 5 under the action of gravity or additional external force, and is rapidly co...

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Abstract

A method for preparing high-speed steel billet includes such steps as smelting the molten high-speed steel, pouring in temp controllable tundish, regulating its temp to 1-5 deg.C higher than its liquid phase line, continuously pouring it in preheated precrystallizer, turning on its stirrer, vibrator and temp regulator for controlling cooling speed and temp gradient to suppress the growth of dendrite, gravitationally flowing in final crystallizer, quick cooling and coagulating and continuously pulling its billet out by a billet puller. It features excellent construction performance.

Description

technical field [0001] The invention relates to a continuous preparation method and equipment for high-speed steel blanks, which are suitable for the preparation of high-speed steel blanks with various cross-sectional shapes. Background technique [0002] High speed steel is an important tool steel. The high-speed steel billets in the prior art are mainly cast into ingots first, and then undergo electroslag remelting, forging or rolling to form billets with a certain cross-section. The larger the size of the steel ingot, the coarser the carbides inside it, the greater the amount of deformation required for subsequent forging and rolling, and the more prone to cracks. However, reducing the size of the steel ingot not only reduces the productivity, but also makes it difficult to ensure the necessary amount of forging and rolling deformation, resulting in unsatisfactory performance. Therefore, how to obtain a billet containing uniform fine carbides is a difficult problem in t...

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Application Information

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IPC IPC(8): B22D11/11
Inventor 邢书明戴安国邢文斌和优锋张励忠
Owner BEIJING JIAOTONG UNIV