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

A continuous casting process and chain steel technology, applied in the field of metallurgy, can solve problems such as liquid level fluctuation, and achieve the effects of improving the segregation of element components, improving the quality of the billet, and the internal and external quality of the billet.

Inactive Publication Date: 2013-08-21
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 inclus...

Method used

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Embodiment Construction

[0020] A continuous casting process of high-grade high-quality chain steel, the specific requirements of the process are as follows:

[0021] 1) Before the casting machine starts pouring, put the mold slag into the mold slag baking furnace for baking, the baking temperature is controlled at 140±10°C, and the baking time is 40±10min to ensure that the mold slag is dry and preheated;

[0022] 2) During the pouring process, the pouring from the ladle to the tundish and from the tundish to the crystallizer is fully protected, and the tundish is filled with argon before pouring; the ladle to the tundish is poured with long nozzle argon seal protection; the tundish to the crystallizer is made of high-quality The overall built-in submerged nozzle protects the pouring; the method of adding mold slag is: add 0.6±0.1kg to each flow, and the cycle time is 5±1min, to ensure that the slag surface of the mold slag in the crystallizer remains stable and the total thickness of the mold slag la...

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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...

Claims

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Application Information

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IPC IPC(8): B22D11/10B22D11/111B22D11/114B22D11/117
Inventor 宋金平陈兴华朱守欣李林赵张发武爱萍
Owner NANJING IRON & STEEL CO LTD
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