Smelting method of low-carbon aluminium killed steel with low silicon content
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of low-carbon aluminum-killed steel and a smelting method, which is applied in the field of steelmaking in the metallurgical industry, can solve problems such as inapplicability of aluminum-killed steel, and achieve the effects of low production cost and low energy consumption
Active Publication Date: 2011-07-27
HEBEI IRON AND STEEL
View PDF3 Cites 30 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
However, the above-mentioned process method is not suitable for blast furnace vanadium-containing molt
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Examples
Experimental program
Comparison scheme
Effect test
Example Embodiment
[0024] Example 1:
[0025] Production steel grade SPHC, molten iron [C] 4.50%, [Si] 0.60%, molten iron temperature 1230°C; semi-steel [C] 4.00%, [Si] 0.003%, molten iron temperature 1330°C after vanadium extraction; semi-steel undergoes converter smelting After tapping, the molten steel [C] 0.02%, [Si] 0.008%, Als 0.02%, and the temperature is 1613℃; after the molten steel enters the aluminum feeding line of the refining station, the molten steel [C] 0.02%, [Si] 0.01%, Als 0.05% , Temperature 1606℃; after refining, molten steel [C] 0.04%, [Si] 0.02%, Als 0.045%, temperature 1576℃; finished steel billet chemical composition [C] 0.04%, [Si] 0.020%, Als 0.040%.
Example Embodiment
[0026] Example 2:
[0027] Steel production: export low-silicon SPHT1, molten iron [C] 4.41%, [Si] 0.50%, molten iron temperature 1220℃; semi-steel [C] 3.98%, [Si] 0.01% after vanadium extraction, molten iron temperature 1336℃; half After the steel is tapped by converter smelting, the molten steel [C] 0.02%, [Si] 0.005%, Als 0.02%, and the temperature is 1608℃; after the molten steel enters the refining station to feed the aluminum wire, the molten steel [C] 0.02%, [Si] 0.009% , Als 0.05%, temperature 1600℃; after refining, molten steel [C] 0.05%, [Si] 0.01%, Als 0.045%, temperature 1570℃; the chemical composition of the finished steel billet [C] 0.05%, [Si] 0.010%, Als 0.040%.
Example Embodiment
[0028] Example 3:
[0029] Steel production: export low-silicon SS400, molten iron [C] 4.96%, [Si] 0.65%, molten iron temperature 1218℃; semi-steel after vanadium extraction [C] 4.25%, [Si] 0.006%, molten iron temperature 1310℃; half After the steel is tapped by converter smelting, the molten steel [C] 0.04%, [Si] 0.008%, Als 0.03%, and the temperature is 1612℃; after the molten steel enters the aluminum feeding line of the refining station, the molten steel [C] 0.04%, [Si] 0.015% , Als 0.035%, temperature 1604℃; after refining, molten steel [C] 0.10%, [Si] 0.03%, Als 0.030%, temperature 1578℃; the chemical composition of the finished steel billet [C] 0.11%, [Si] 0.03%, Als 0.030%.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention relates to a smelting method of the low-carbon aluminium killed steel with a low silicon content, belonging to the steelmaking technical field of the metallurgy industry. The technical scheme in the invention is as follows: before blast furnace vanadium-containing molten iron enters the steelmaking process, the processes of vanadium extraction and silicon removal are performed, the steelmaking process adopts the semi-steel smelting process, low-silicon pre-melted composite refining slag is added in molten iron during the slag-stopping tapping process, the deoxidizing process andthe alloying process for pre-deoxidation; after molten iron enters the ladle furnace (LF) refining process, the conventional mode for preparing white slag through electrode heating is not adopted, white slag is rapidly prepared by covering a cover for heat preservation and using aluminum powder as a deoxidizer in the reducing atmosphere of argon stirring; then calcium treatment and argon soft blowing are performed, the thermodynamic and dynamical conditions of the silicon kickback of molten steel are inhibited under the premise of ensuring the refining quality; and after the argon soft blowing of molten steel is completed, molten steel enters the continuous casting process. By adopting the method, the Si element qualification rate of the low-silicon and low-carbon aluminium killed steel is up to more than 98%; and as the refining electrode heating process is not adopted, the method is characterized by low energy consumption, environmental protection and low production cost.
Description
technical field [0001] The invention relates to a low-silicon-content low-carbon aluminum-killed steel smelting method, which belongs to the technical field of steelmaking in the metallurgical industry. Background technique [0002] At present, when iron and steel enterprises produce low-carbon and aluminum-killed steels with silicon content less than or equal to 0.03%, such as SPHC, 08Al and other steel types, they usually adopt the production process of desulfurization outside the molten iron furnace + converter smelting + LF refining + continuous casting. The biggest problem in the production process is that the Si content in the steel is difficult to control. Since the steel contains a certain amount of Al, the phenomenon of Si reversion is very easy to occur during the refining and reduction process of the LF furnace, causing the Si content of the finished product to exceed the standard. It can only reach about 83%-90%. Chinese patent application 200610166553.X, titled...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more