Sulfur control method in high-sulfur steel smelting process

A control method and a smelting process technology, applied in the field of iron and steel metallurgy, can solve the problems of inconvenient arrangement, high melting point of lime and wollastonite, and unsatisfactory refining effect.

Active Publication Date: 2018-03-23
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the sulfur content in most sulfur-based free-cutting steels in the world is 0.1-0.4%, which is 10-100 times the sulfur content in normal pure steels. Therefore, the smelting process of sulfur-containing free-cutting steels is significantly different from that of pure steels. In the refining process, low-alkalinity slag needs to be produced, and the alkalinity of the refining slag is W CaO /W SiO2 It is advisable to control the value of 1.0 to 1.5, where W CaO is the mass percentage of CaO in the slag, W SiO2 SiO in slag 2 At present, steel mills are using lime (mainly composed of CaO) and wollastoni

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the smelting process of high-sulfur steel, the amount of sulfur-iron alloy added is calculated according to the middle limit of the sulfur content in the target composition of molten steel. During the tapping process of the primary furnace, the sulfur-iron alloy is added to the ladle along with the steel flow, and the blast furnace slag is used as Synthetic slag is added into the ladle along with the steel flow, and the amount of blast furnace slag added is 5kg / ton of steel. The mass percentage of the main components of blast furnace slag is: CaO: 40-42%, SiO 2 :34~36%,Al 2 o 3 : 13~15%, MgO: 5~7%, S: 0.8~2%.

[0034] After the steel tapping is completed, the ladle is transported into the LF refining furnace area. After the LF furnace enters the station, a large flow of argon gas is blown in from the breathable brick at the bottom of the ladle for stirring. After the components of the molten steel are stirred evenly, a steel sample is taken for component analysis. ...

Embodiment 2

[0036] A method for controlling sulfur in a high-sulfur steel smelting process, comprising the following steps:

[0037]1) In the smelting process of high-sulfur steel, iron-sulfur alloy is added in the ladle along with the steel flow during the tapping process of the primary smelting furnace, and the addition amount of iron-sulfur alloy is calculated according to the middle limit of the sulfur content in the target composition of molten steel, and the high-sulfur alloy is added The slag is added into the ladle as a synthetic slag with the steel flow. The amount of blast furnace slag added is 8kg / ton of steel; the mass percentage of the main components of blast furnace slag is: CaO: 40-42%, SiO 2 :34~36%,Al 2 o 3 : 13~15%, MgO: 5~7%, S: 0.8~2%; basicity of blast furnace slag W CaO / W SiO2 The value of is: 1.1~1.3.

[0038] 2) After the primary smelting furnace is tapped, the ladle is transported into the area of ​​the LF refining furnace. After the LF furnace enters the st...

Embodiment 3

[0044] A method for controlling sulfur in a high-sulfur steel smelting process, comprising the following steps:

[0045] 1) In the smelting process of high-sulfur steel, iron-sulfur alloy is added in the ladle along with the steel flow during the tapping process of the primary smelting furnace, and the addition amount of iron-sulfur alloy is calculated according to the middle limit of the sulfur content in the target composition of molten steel, and the high-sulfur alloy is added The slag is added into the ladle as a synthetic slag along with the steel flow. The amount of blast furnace slag added is 6kg / ton of steel; the mass percentage of the main components of blast furnace slag is: CaO: 40-42%, SiO 2 :34~36%,Al 2 o 3 : 13~15%, MgO: 5~7%, S: 0.8~2%, basicity of blast furnace slag W CaO / W SiO2 The value of is: 1.1~1.3.

[0046] 2) After the primary smelting furnace is tapped, the ladle is transported into the area of ​​the LF refining furnace. After the LF furnace enters...

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and relates to a sulfur control method in a high-sulfur steel smelting process. In the high-sulfur steel smelting process, blast furnace slag is used as synthetic slag so as to be added to a steel ladle along with steel flow, and the addition of the blast furnace slag is 5 to 8 kg per ton of steel. The production cost can be reduced, and the resource utilization rate can be increased.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular, the invention relates to a sulfur control method in the smelting process of high-sulfur steel. Background technique [0002] In the pure steel smelting process, sulfur is a harmful element. When the sulfur content in the steel is too high, it will cause hot embrittlement, cause difficulties in the hot processing of the steel, and deteriorate the mechanical properties of the steel. However, in some steels that require precision cutting, sulfur can improve the cutting performance of such steels. Sulfur and manganese form manganese sulfide inclusions in the steel. Such inclusions can interrupt the continuity of the base metal. Promote chip breaking to form a small and short curl radius, which is easy to remove, reduces tool wear, reduces machined surface roughness, and improves tool life. Generally, the machinability of steel increases with the increase of sulfur co...

Claims

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Application Information

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IPC IPC(8): C21C7/076C22C38/60C21C7/06
CPCC21C7/0056C21C7/0087C21C7/06C21C7/076C22C38/60Y02P10/20
Inventor 刘洪银孙建卫路峰王孝科郝帅袁鹏举亓伟伟王奉县
Owner SHANDONG IRON & STEEL CO LTD
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