Water distribution process in the secondary cold room during continuous casting of molten steel

Abstract

The invention provides a secondary cooling chamber water distribution technology adopted in the molten steel continuous casting process. The non-equal-proportion water distribution mode is adopted, inother words, a secondary cooling chamber is divided into a plurality of sections, the specific water flow and the water distribution proportion of various sections are set according to the drawing speed, the specification of a continuous casting machine and the casting temperature, and the surface temperature of casting blanks at the same position in the secondary cooling chamber is the same. According to the secondary cooling chamber water distribution technology, the macro quality of the casting blanks is greatly improved, a small square billet continuous casting machine with the specifications being R10 m arc and 150 mm x 150 mm is particularly used, the secondary cooling water distribution mode is adopted, the inner heat of the casting blanks in the secondary cooling chamber is conducted out to be matched with the surface heat dissipation rate under different drawing speeds; the practice proves that after the secondary water distribution mode is adopted, when the drawing speed isincreased to 2.8 m / min or above, the defects that macro grading is conducted to be above the national standard III and common defects such as center cracking, middle cracking and hole shrinking can beeffectively overcome; and grading within the national standard II can reach 95%.

Description

technical field [0001] The invention relates to a casting process, in particular to a secondary cold room water distribution process in the continuous casting process of molten steel. Background technique [0002] The continuous casting process is one of the middle-end processes in the iron and steel smelting production process. Its purpose is to cast molten steel into qualified billets and provide rolling raw materials for rolling steel. The secondary cooling room is usually divided into multiple sections to cool the slab with water. The water distribution methods can be roughly divided into three types. One is manual water distribution, that is, the amount of water supply is manually adjusted according to various casting parameters. [0003] The second is automatic water distribution, that is, the corresponding water volume is set by different casting speeds, and the program automatically controls the water supply in each area. In the traditional automatic water distributi...

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Problems solved by technology

[0005] Compared with automatic water distribution, manual water distribution is too rigid and slow in response; dynamic water distribution equipment and programs require a lot of maintenance and poor accuracy, and are still in the stage of experimental development. Although the application of automatic water distribution is relatively mature, it can correspond to the speed range relatively narrow