Method for manufacturing low-carbon and low-silicon steel

A manufacturing method, low-carbon and low-silicon technology, applied in the manufacture of converters, etc., can solve the problems of high Al2O3 inclusions in deoxidation products, strong oxidation of molten steel, nodules in continuous casting nozzles, etc., to achieve convenient implementation, reduce steelmaking costs, The effect of improving cleanliness

Active Publication Date: 2014-03-12
SGIS SONGSHAN CO LTD
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Problems solved by technology

[0004] To sum up, the existing low-carbon and low-silicon steelmaking methods have the following disadvantages: because the control of C in steel relies on converters or electric furnaces (collectively referred to as steelmaking furnaces) to lower C and tap steel, resulting in the oxidation of molten steel in the furnace. strong (see figure 1 ), the end point C of the steelmaking furnace is generally required to be controlled below 0.06%; it is necessary to add a large amount of deoxidi

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  • Method for manufacturing low-carbon and low-silicon steel

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[0023] Example 1 :

[0024] A low-carbon and low-silicon steel manufacturing method. The 120t converter steelmaking plant manufactures SWRCH6A cold heading steel billets. The chemical composition control requirements of the steel are as follows: C: 0.03%~0.06%, Si: ≤0.04%, Mn: 0.20~ 0.35%, P≤0.015%, S≤0.010%, Als: 0.025~0.045%, the balance is Fe and other inevitable impurity elements; and smelted in 120t converter → RH furnace vacuum treatment → LF furnace refining → billet connection The production steps of casting are made.

[0025] The end point C of the converter is controlled within the range of 0.06%~0.10%, the end point temperature: 1650~1670℃; 300kg of high-carbon ferromanganese alloy is added during the tapping process of the converter; the free oxygen content before the vacuum treatment of the molten steel is controlled within the range of 200~480ppm, RH vacuum When the vacuum degree reaches 0.27Kpa for 7-8min, the carbon content in the steel is reduced to 0.002%~0.02% ...

Example Embodiment

[0026] Example 2 :

[0027] A low-carbon and low-silicon steel manufacturing method. The 120t converter steelmaking plant manufactures Q195LB low-carbon drawn steel billets. The chemical composition control requirements of the steel are as follows: C: 0.03%~0.08%, Si: 0.02~0.06%, Mn: 0.10%~0.25%, P≤0.025%, S≤0.030%, the balance is Fe and other unavoidable impurity elements; and it is produced by the production steps of converter → RH furnace vacuum treatment → billet continuous casting, and converter end point control :C: 0.06%~0.10%, bath temperature: 1680~1700℃; 100kg high-carbon ferromanganese alloying is added during the converter tapping process; free oxygen content is 250~500ppm before vacuum treatment in RH furnace, RH vacuum treatment is 7-8min vacuum When the temperature reaches 0.27KPa, the carbon and oxygen content in the steel ranges from 0.010%~0.030%, 150~250ppm respectively. After the vacuum degree reaches 0.27Kpa, add 30~40kg aluminum particles and a small amoun...

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Abstract

The invention relates to a method for manufacturing low-carbon and low-silicon steel. The requirement of the low-carbon and low-silicon steel on low contents of carbon and silicon is surely satisfied via decarbonizing and deoxidizing with an RH vacuum treatment device, as a result, the content of the end carbon of a steel-smelting furnace is increased, the after-blow is reduced, the oxidizability of molten steel is lowered, the cost of deoxidization and alloying is reduced, and the purity of the steel is improved; according to the quality requirement of the steel, the secondary refining of the molten steel can adopt two methods, i.e. RH vacuum treatment or combination of the RH vacuum treatment and LF (Ladle Furnace) refining. By utilizing vacuum natural decarbonization and deoxygenation, brittle Al2O3 impurities generated by aluminum deoxidation are reduced, the cleanliness of the steel is improved, silicon added to the molten steel can be effectively controlled from the steel-smelting furnace tapping to the RH vacuum treatment, C and Si in the steel are easy to control and stable; the Al2O3 impurities generated by deoxygenation are greatly reduced and reasonable Ca deformation treatment is performed, so that the castability of the molten steel is good, and the problem of nozzle clogging caused during continuously casting the type of steel is avoided.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy clean steel manufacturing, and relates to a method for manufacturing low-carbon and low-silicon steel by using an RH vacuum treatment device to produce low-carbon and low-silicon steel by decarburization and deoxidation technology under high vacuum conditions. Background technique [0002] Low-carbon and low-silicon series steel refers to the steel grade whose chemical composition C content is in the range of 0.03~0.10%, and the Si content is in the range of 0.02~0.10%. Als). Low-carbon and low-silicon steel has a wide range of uses because of its good plasticity and easy processing. According to the product use, there are SPH series steel for stamping and panel forming, low-strength fastener steel for manufacturing, wire drawing steel for hardware and galvanized wire series, welding rod steel, etc. [0003] Low-carbon and low-silicon steel has a variety of smelting process met...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/06C21C7/068C21C5/28C22C38/06C22C38/04
Inventor 张志明何矿年丘文生夏长松李志坚
Owner SGIS SONGSHAN CO LTD
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