Continuous casting process for high-class high-quality chain steel

Abstract

The invention discloses a continuous casting process for high-class high-quality chain steel. According to the continuous casting process, a method of process control is adopted, a large billet caster is adopted for continuous casting, the portion from a large ladle to a tundish and the portion from the tundish to a crystallizer are poured in a protecting mode, argon gas is filled in the tundish before pouring, the portion from the steel ladle to the tundish is poured in a protecting mode through a long nozzle argon seal, the portion from the tundish to the crystallizer is poured in a protecting mode through a high-quality whole internally-installed submerged nozzle, a high-quality current stabilizer is adopted in the tundish impact area, a covering agent is used in molten steel in the tundish, the temperature of the tundish is measured continuously, automatic water distribution is carried out in the crystallizer and for secondary cooling, and the crystallizer is stirred in an electromagnetic mode and pressed dynamically and slightly. According to the continuous casting process, the internal and external quality of a casting blank is good, no connection blanks and slag pits exist in the surface, and performance of cogging rolled steel meets requirements of users.

Description

[0001] technical field [0002] The invention belongs to the field of metallurgy and relates to a continuous casting process, in particular to a continuous casting process of low-carbon high-grade high-quality chain steel. Background technique [0003] With the rapid development of my country's mining industry, the domestic demand for high-strength circular chain products is increasing, and the quality requirements for high-strength circular chain products are getting higher and higher. 23MnNiMoCr54 steel is a German brand. Before the 1990s, it mainly relied on imports from abroad. Since the 1990s, the supply of 23MnNiMoCr54 high-grade chain steel that has been using imported materials has become increasingly tight, which has become a bottleneck restricting the rapid development of domestic high-strength round link chain production. To alleviate the tense situation of imported materials, the localization of high-grade and high-quality steel is imperative, and there is an urgen...

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the problems existing in the prior art, the object of the present invention is to propose a continuous casting process of high-grade high-quality chain steel, which can effectively reduce the impact of steel flow from the ladle to the tundish, fully float the inclusions, and prevent the pouring process from being caused by Inclusions cause nozzle blockage and crystallizer liquid level fluctuations, which can eliminate slag pits and billet defects caused by liquid level fluctuations, and improve the casting billet quality of high-grade high-quality chain steel