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Smelting method of medium-high-carbon sulfur-lead complex system free-cutting structural steel

A smelting method and easy-cutting technology, applied in the field of metallurgy, can solve the problems of less smelting production process, increased cost, inability to take into account the control of lead uniformity gas content, etc., so as to avoid the deterioration of the fluidity of the slag system and reduce the consumption of sulfur , the effect of preventing nitrogen increase

Inactive Publication Date: 2020-07-28
SHOUGANG GUIYANG SPECIAL STEEL
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are many smelting and production processes for "sulfur free-cutting steel" in the domestic iron and steel industry, but there are very few smelting and production processes for "sulfur-lead composite free-cutting steel", and none of them can produce high-quality medium-high carbon lead-containing free-cutting structural steel. production
The existing problems are: (1) It cannot take into account the effective control of vacuum degassing treatment and sulfur content
(2) The uniformity of lead and the control of gas content in steel cannot be taken into account
(3) It is impossible (or even lacks this technology) to control the poor surface of the slab caused by the lead and sulfur in the steel, resulting in the need for surface grinding of the slab before rolling, which increases the cost

Method used

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Embodiment 1

[0013] Example 1: A method for smelting medium-high carbon sulfur-lead composite system free-cutting structural steel, including primary refining process + LF and vacuum degassing refining process, the primary refining process includes electric furnace, die casting or converter, when tapping According to the original S content in the steel, the composition requirements of the steel type, and the desulfurization rate of the initial slag system of special steel tapping, sulfur or sulfur iron blocks are used to increase sulfur, and lime and high-purity quartz sand are used to configure the main slag system components to contain C and Si. , Al, Mn deoxidizers and alloys are used as deoxidation alloying materials to control the single basicity CaO / SiO of the initial slag system 2 =1.5~3.0, of which CaO: 40~50%, SiO 2 : 10~30%, Al 2 o 3 ≤15%, the rest are MnO, MgO, iron oxides, other oxides and impurities.

[0014] The initial smelting process of the lead-containing free-cutting ...

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Abstract

The invention discloses a smelting method of medium-high-carbon sulfur-lead complex system free-cutting structural steel. The smelting method comprises the processes of primary smelting, LF refining and vacuum degassing refining, wherein the process of primary smelting involves an electric furnace or a converter, and during tapping, sulphur or ferrous sulfide blocks are used according to the requirements for the original S content in steel and the components of steel balls and the desulfurization rate of an initial slag system during special steel tapping to achieve resulfurization; lime and high-purity quartz sand are adopted for preparing components of the main slag system, a deoxidizing agent and alloy containing C, Si, Al and Mn are taken as deoxidation alloying materials, and harmfuloccluded foreign substances are well controlled. By means of the smelting method, consideration to the good gas removal effect and good control over lead content can be guaranteed, and the situation that the gas content rises again to a great extent due to leading operation after vacuumizing is avoided; and meanwhile, through the combination of different vacuum modes and leading modes, a process dedusting system can be effectively utilized to collect lead vapor, the environment is prevented from being affected, and a great effect is achieved.

Description

technical field [0001] The invention relates to a method for smelting free-cutting steel, in particular to a method for smelting medium-high carbon sulfur-lead composite system free-cutting structural steel, belonging to the technical field of metallurgy. Background technique [0002] At present, there are many smelting and production processes for "sulfur free-cutting steel" in the domestic iron and steel industry, but there are very few smelting and production processes for "sulfur-lead composite free-cutting steel", and none of them can produce high-quality medium-high carbon lead-containing free-cutting structural steel. production. The existing problems are: (1) Vacuum degassing treatment and effective control of sulfur content cannot be taken into account. (2) The uniformity of lead and the control of gas content in steel cannot be taken into account. (3) It is impossible (even lacking this technology) to control the poor surface of the slab caused by the lead and su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/06C21C7/00
CPCC21C7/0006C21C7/0025C21C7/06C21C7/10
Inventor 王翔刘厚权郑玉龙邱智捷张小波黄昌洪柏韬吕迺冰于嘉君高航金俊鑫
Owner SHOUGANG GUIYANG SPECIAL STEEL
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