Method for smelting low-silicon cold heading steel
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A technology for cold heading steel and converter smelting, applied in the field of cold heading steel smelting, can solve problems such as silicon addition, and achieve the effect of avoiding silicon addition
Active Publication Date: 2012-11-21
SHOUGANG CORPORATION
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[0005] The purpose of the present invention is to provide a method for smelting low-silicon cold heading steel, which solves the problem of silicon increase in the LF refining process in the prior art, and can achieve Relatively stable production, and the timing of adding materials is reasonable, which can shorten the refining time, improve production efficiency, and stably produce cold heading steel with Si≤0.05%
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Embodiment 1
[0026] 1) The sulfur content after pretreatment of magnesium-sprayed molten iron is 0.05%, and the slag removal rate is >95%;
[0027] 2) The basicity of converter slag is 4.0;
[0028] 3) Add 801Kg of lime and 202Kg of fluorite when the tapping amount is 1 / 5;
[0029] 4) When the tapping amount is 2 / 5, add 1.1 tons of Al-Mn-Fe;
[0030] 5) Sampling and analysis of Si content after tapping is 0.027%, and acid-soluble aluminum content is 0.0483%;
[0031] 6) After LF enters the station, add 300kg of aluminum and iron, and the alkalinity of the incoming slag is 5.3;
[0032] 7) After LF enters the station, add 2 tons of slagging raw materials, including 1 ton of lime, 0.54 tons of bauxite, 0.47 tons of synthetic slag, 7.21 basicity of refining slag, and 1.08% total iron content;
[0033] 8) Before LF adjusts other alloy components, evenly add 150kg of aluminum particles and calcium carbide to the slag surface;
[0034] 9) The silicon content is 0.05% at the end of the LF ref...
Embodiment 2
[0036] 1) The sulfur content after pretreatment of magnesium-sprayed molten iron is 0.05%, and the slag removal rate is >95%;
[0037] 2) The basicity of converter slag is 3.9;
[0038] 3) Add 800Kg of lime and 201Kg of fluorite when the tapping amount is 1 / 5;
[0039] 4) When the tapping amount is 2 / 5, add 1.1 tons of Al-Mn-Fe;
[0040] 5) Sampling and analysis of Si content after tapping is 0.022%, and acid-soluble aluminum content is 0.0626%;
[0041] 6) After LF enters the station, add 300kg of aluminum and iron, and the alkalinity of the incoming slag is 4.9;
[0042] 7) After LF enters the station, add 2 tons of slagging raw materials, including 1 ton of lime, 0.54 tons of bauxite, 0.47 tons of synthetic slag, 7.42 basicity of refining slag, and 1.08% total iron content;
[0043] 8) Before LF adjusts other alloy components, evenly add 140kg of aluminum particles and calcium carbide to the slag surface;
[0044] 9) The silicon content at the end of the LF refining tre...
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Abstract
The invention discloses a method for smelting low-silicon cold heading steel, and belongs to the technical field of the smelting of cold heading steel. The method comprises the following steps of: making slag with high basicity of between 3.5 and 4.5 by a converter, controlling the slag amount of converter tapping, and reducing the content of SiO2 in slag of converter tapping; in the low-frequency (LF) process, slagging by using raw materials such as lime, bauxite, synthetic slag and the like, regulating the slag basicity of an LF furnace to 5 to 9, and reducing the activity of SiO2 in slag; adding aluminum particles and calcium carbide onto the top of the slag and indirectly deoxidizing in the LF refining process so as to fulfill the aims of controlling the oxidability of refining slag and avoiding the increase of Si; and adding ferroaluminum to regulate the content of aluminum at the early stage of the LF refinement according to the target of the LF internal control of Al. The method has the advantage that: the problem of silicon increase in the LF refining process in the prior art is solved.
Description
technical field [0001] The invention belongs to the technical field of cold heading steel smelting, and in particular provides a method for smelting low silicon cold heading steel. The converter smelting-LF refining process is used to produce low-silicon cold-heading steel, specifically through the control of the LF refining process and the indirect deoxidation smelting method of combining aluminum particles and calcium carbide. Background technique [0002] In the subsequent use and drawing process of cold heading steel, as the area reduction rate of cold drawing increases, the hardening is severe, the consumption of wire drawing dies increases, and the sensitivity to fracture increases, so low Si content is required. In addition, cold heading steel requires 1 / 2 upsetting to be qualified, so the molten steel has a certain degree of cleanliness, and converter smelting——LF refining smelting process is often used. [0003] In most converter steelmaking plants at home and abro...
Claims
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