Step-by-step deoxidation operation method suitable for low-carbon steel

Abstract

The invention discloses a step-by-step deoxidation operation method suitable for low-carbon steel. The step-by-step deoxidation operation method comprises the following specific steps that a deoxidation route of low-carbon steel production carries out deoxidation by adopting a step-by-step operation method of a converter and a steel ladle, as follows: 1, carrying out precipitation deoxidation on molten steel in the converter by adopting an aluminum deoxidizer in the earlier stage of tapping; and 2, tapping the deoxidized molten steel in the converter to the steel ladle, and alloying by adopting secondary deoxidation, wherein the deoxidation sequence is from weak to strong by adopting a mode of calcium carbide, low-carbon ferromanganese, aluminum ferromanganese and silicon-calcium alloy.

Description

technical field [0001] The invention relates to a step-by-step deoxidation operation method suitable for low-carbon steel. Background technique [0002] With the development of my country's metallurgical industry, the production process of welded disc and round steel has changed greatly. Because it is low-carbon and low-silicon steel, in the past, my country has always adopted the method of die-casting boiling steel for production. Now the die-casting technology is gradually eliminated and turned to high efficiency. Continuous casting and rolling technology, now large and medium-sized iron and steel plants are using continuous casting and high-speed wire rolling to produce welding rod steel, but using continuous casting technology can only produce killed steel, but this has caused some quality defects, such as high gas content, Disadvantages such as high round strength and low elongation, which lead to easy breaking during deep processing, also cause instability of welding arc...

AI Technical Summary

Problems solved by technology

However, the above operations will inevitably increase the total oxygen content in the steel, resulting in an increase in the consumption of the aluminum alloy deoxidized alloy

If all the deoxidation process adopts the deoxidation process of adding aluminum to the ladle, since aluminum is a strong deoxidizer, Al2O3 will be generated if the aluminum ladle is used alone for deoxidation, and the melting point of Al2O3 is as high as 2050°C, and it is solid at the temperature of molten steel. When the content of Al2O3 is high, the molten steel can be Poor castability, easy to block the nozzle, and Al2O3 is an indeterminate inclusion, which affects the performance of the steel and has a certain impact on the stability of production and on-site operation