continuous casting of stainless steel

Stainless steel continuous casting is to transport the ladle containing the refined molten steel to the turntable. After the turntable is rotated to the pouring position, the molten steel is poured into the tundish, and the tundish distributes the molten steel to each mold from the nozzle. The mold is one of the core equipment of the continuous casting machine, which forms the casting and rapidly solidifies and crystallizes. The tension leveler and the crystallizing vibration device work together to pull out the castings in the mold, and after cooling and electromagnetic stirring, they are cut into slabs of a certain length.

The rapid development of continuous casting technology is a very striking trend in the development of contemporary iron and steel industry. The reason why continuous casting develops rapidly is that it has greater technical and economic advantages compared with traditional ingot mold casting, which is mainly manifested in The following aspects.

(1) Simplify the production process

Because continuous casting can save the blooming process, it not only saves the energy consumption of soaking furnace heating, but also shortens the cycle time from molten steel to billet. One of the major developments in continuous casting in recent years has been the tendency to cast slabs close to the finished section size, which will simplify the rolling process.

(2) Improve the yield of metal

The yield from molten steel to billet by ingot mold casting is about 84-88%, while continuous casting is about 95-96%, so the continuous casting process can save metal by 7-12%, which is a considerable figure . One of the important reasons why the Japanese steel industry is competitive in the world is the large-scale adoption of continuous casting in the steel industry. Since 1985, the continuous casting ratio in Japan has exceeded 90%. For expensive special steel, stainless steel, casting by continuous casting, its economic value is even greater. After the second steelmaking plant of Wuhan Iron and Steel Company in my country replaced die casting with continuous casting, the cost per ton of billet was reduced by about 170 yuan. Calculated based on the annual output of 8 million tons, the annual profit was about 1.35 billion yuan. It can be seen that improving the metal yield and simplifying the production process will obtain considerable economic benefits.

(3) Save energy consumption

According to relevant information, the production of 1 ton of continuous casting billet saves 627-1046KJ of energy compared to die-casting billet, which is equivalent to 21.4-35.7kg of standard coal, and the energy consumption saved by increasing the yield is greater than 100kg of standard coal. According to my country's energy consumption level, the comprehensive energy saving per ton of continuous casting billet is about 130kg of standard coal.

(4) Improve labor conditions and facilitate automation

The degree of mechanization and automation of continuous casting is relatively high, and the continuous casting process has been automatically controlled by computers, which frees the operators from heavy manual labor. In recent years, with the development of science and technology and the improvement of automation level, electronic computers are also used for the control of continuous casting production. Except for the operation of pouring steel, all are controlled by computers.

(5) The quality of the casting billet is good

Due to the fast cooling rate, continuous casting, and controllable and stable casting conditions, the internal structure of the slab is uniform, dense, less segregation, and stable in performance. The plate rolled from the continuous casting billet has better transverse properties than die casting, and good deep drawing properties, and other performance indicators are also better than die casting. In recent years, continuous casting has been used to produce slabs with no defects on the surface, which can be directly hot-rolled and rolled into steel.