Manufacturing method of steel

A manufacturing method and molten steel technology, applied in the field of steel manufacturing, can solve problems such as the difficulty in determining the amount of calcium wire to be fed, not involving the casting performance of molten steel, and the difficulty in grasping the content of inclusions, etc., so that the manufacturing method is simple and easy to operate, preventing Effect of nodulation and improvement of casting performance

Inactive Publication Date: 2013-09-11
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the calcium wire is fed after the molten steel is pre-deoxidized. At this time, the inclusions are not fully floating, and the denaturation effect of the calcium treatment on the inclusions is affected. At the same time, the content of the inclusions in the molten steel is not easy to grasp. Therefore, feeding The amount of calcium filaments is difficult to determine
In addition, the method disclosed in the Chinese patent does not involve the casting performance of molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] Utilize 70 tons of high-impedance ultra-high-power electric arc furnaces to use the manufacturing method of steel according to the present invention to produce 16Mn steel, and its process steps are as follows:

[0045] Initially smelt 69 tons of molten steel in the electric furnace. Add aluminum balls and silicon-aluminum-barium-calcium as a pre-deoxidizer to the ladle during the tapping process for pre-deoxidation, and use bottom blowing argon to stir, wherein, the amount of aluminum balls added is 1.1Kg per ton of steel, silicon-aluminum-barium The amount of calcium added is 3.5Kg per ton of steel. Then lift the ladle containing molten steel to the refining station of the LF furnace, feed 30Kg of aluminum wire, and then add synthetic slag at a rate of 13Kg per ton of steel. In 100 parts by weight of synthetic slag, 65.4 parts by weight of CaO, Al 2 o 3 17.3 parts by weight, SiO 2 3.0 parts by weight, MgO 2.0 parts by weight, CaF 2 12.1 parts by weight and unav...

example 2

[0047] Utilize 70 tons of high-impedance ultra-high-power electric arc furnace to use the manufacturing method of steel according to the present invention to produce Q345B steel, and its processing steps are as follows:

[0048] 72 tons of molten steel were initially smelted in the electric furnace. During the tapping process, aluminum balls and silicon aluminum barium calcium are added to the ladle as a pre-deoxidizer for pre-deoxidation, and bottom-blown argon is used to stir. Among them, the amount of aluminum balls added is 1.3Kg per ton of steel, silicon aluminum barium The amount of calcium added is 3.1Kg per ton of steel. Then lift the ladle containing molten steel to the refining station of the LF furnace, feed 40Kg aluminum wire, and then add synthetic slag at 12Kg per ton of steel. In 100 parts by weight of synthetic slag, 65.4 parts by weight of CaO, Al 2 o 3 17.3 parts by weight, SiO 2 3.0 parts by weight, MgO 2.0 parts by weight, CaF 2 12.1 parts by weight...

example 3

[0050] Utilize 70 tons of high-impedance ultra-high-power electric arc furnace to use the manufacturing method of steel according to the present invention to produce B-grade steel, and its process steps are as follows:

[0051] Initially smelt 70 tons of molten steel in the electric furnace. During the tapping process, aluminum balls and silicon aluminum barium calcium are added to the ladle as a pre-deoxidizer for pre-deoxidation, and bottom-blown argon is used to stir. Among them, the amount of aluminum balls added is 1.4Kg per ton of steel, silicon aluminum barium The amount of calcium added is 3.3Kg per ton of steel. Then lift the ladle containing molten steel to the refining station of the LF furnace, feed 45Kg of aluminum wire, and then add synthetic slag at a rate of 14Kg per ton of steel. In 100 parts by weight of synthetic slag, 65.4 parts by weight of CaO, Al 2 o 3 17.3 parts by weight, SiO 2 3.0 parts by weight, MgO 2.0 parts by weight, CaF 212.1 parts by wei...

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Abstract

The invention provides a manufacturing method of steel. The method comprises the following steps: roughly melting molten steel; adding a pre-deoxidizer into a steel ladle in a process from tapping to ladling; and refining the molten steel in an LF (ladle furnace), wherein aluminum is added into the molten steel to perform precipitation and deoxidization in a process of refining the molten steel in the LF furnace; adding the synthesized residues into the ladle to heat; and adding a diffusible deoxidizer into the ladle to perform strengthened deoxidization after the synthesized residues are molten. According to the manufacturing method of steel in the invention, the molten steel can be purified, clogging of a water gap is effectively prevented, and the casting performance of the molten steel is improved. The manufacturing method of steel in the invention is simple, convenient and easy to operate, and has a good application prospect.

Description

technical field [0001] The invention relates to a steel manufacturing method, more specifically, to a steel manufacturing method that improves the casting performance of molten steel. Background technique [0002] Controlling inclusions in steel is an important part of steelmaking process research. Non-metallic inclusions reduce the plasticity, toughness and fatigue properties of steel, and deteriorate the cold and hot processing performance and even some physical properties of steel. At the same time, non-metallic inclusions have a great influence on the casting performance of molten steel. [0003] Aluminum is a strong deoxidizing element, which can effectively reduce the oxygen content in molten steel to a low level, so it is widely used as a deoxidizer in the steelmaking process. The conventional process not only uses aluminum deoxidation in the process of primary molten steel smelting, but also adds aluminum precipitation deoxidation in the LF furnace many times (incl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06
Inventor 王海兵苏雄杰张珉王鑫
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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