連鑄中間包鋼水感應加熱設備

1概述

Tundish molten steel 感應加熱設備 technology is developed with the progress of continuous casting technology, the improvement of steel quality requirements, the need for energy saving and consumption reduction, and the matching of external refining and continuous casting processes. Different steel grades have different requirements on the AT of molten steel superheat. For thick plates, in order to reduce internal cracks and loose center, the AT should be low (5~200T); for cold-rolled thin plates, the surface is required to have good quality. Higher (15~300℃). However, the molten steel superheat must be stabilized within a certain range to minimize fluctuations. This is a necessary condition to ensure the smooth progress of continuous casting production, prevent nozzle blockage or prevent leaking accidents, and ensure the quality of cast slabs. The enhancement of the heating function of the tundish makes it possible to control the superheat of molten steel stably. The temperature of the molten steel of different ladle fluctuates, which has an adverse effect on the continuous casting process, and the heating of the tundish can compensate for it to some extent. However, it must be pointed out that maintaining a stable molten steel superheat mainly depends on the proper tapping temperature and the adjustment structure after tapping, and the tundish heating can only play a supplementary role. Nevertheless, the heating and control of molten steel in the tundish is still receiving attention from the metallurgical community. Some countries represented by Japan, the United States, the United Kingdom, and France have successively carried out research on tundish molten steel heating technology from the 1970s to the 1980s. Japan’s Kawasaki Company first developed and obtained a Japanese patent as early as 1982. At present, the tundish molten steel heating technology successfully developed or under development usually adopts the physical heating method. In the physical heating method, electric energy is used as the heat source and converted according to the electric energy. Different mechanisms can be divided into: electromagnetic induction heating equipment, plasma heating, electroslag heating and DC ceramic heating technology.

中間包感應加熱設備具有以下特點：

(1)加熱速度快，電加熱效率高；

(2)有的還具有一定的電磁攪拌作用，有利於夾雜物的去除；

(3)工藝溫度易於控制，最重要的是更準確地控製鋼水過熱度；

(4)加熱功率受中間包液面深度的限制。只有當中間包內的鋼水積聚到一定深度時，加熱才能順利進行。

中間包感應加熱設備有以下幾種類型：

(1)按感應器的種類可分為無芯感應加熱設備和有芯感應加熱設備；

(2)根據感應器的結構，可分為增加故障型和隧道型（槽、熔槽）感應加熱設備；

(3)按加熱部位可分為局部加熱和整體加熱。

2 連鑄中間包鋼水電磁感應加熱設備裝置

2. 1 與臥式連鑄機配套的中間包電磁感應加熱設備

與臥式連鑄機配套的中間包電磁感應加熱設備如圖10-7所示。

現在說明不銹鋼廠的生產過程。

圖10-7 與臥式連鑄機配套的中間包電磁感應加熱設備

各種不銹鋼配料後，用起重機從進料槽裝入5台1650t感應爐。廢鋼熔化至所需溫度（約8°C）後，將感應爐中的鋼水倒入鋼包中，然後用卡車將鋼水倒入8t AOD爐中，在那裡進行脫碳，排渣、脫磷、除硫，調整合金成分（主要是Cr、Ni），然後出鋼水（成分和溫度符合要求）將鋼包內的鋼水倒入XNUMXt電磁感應加熱設備的鋼包中。經保溫加熱的不銹鋼液經臥式連鑄機拉鑄成圓棒，最後經成型剪切推入冷床。 .