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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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  • Abstract
  • Description
  • Claims
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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 deoxidizer to deoxidize the molten steel, resulting in a lot of Al2O3 inclusions in the deoxidized product, and the purity of the steel is low, which is likely to cause nodules in the continuous casting nozzle; carbon needs to be added Low-content alloy or pure metal alloying, deoxidation alloying cost is high, and because of the strong oxidation of molten steel in the steelmaking furnace, molten steel will seriously corrode the lining of the steelmaking furnace, reducing the life of the lining

Method used

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

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Embodiment 1

[0024] A method for manufacturing low-carbon and low-silicon steel. A 120t converter steelmaking plant manufactures SWRCH6A cold heading steel billets. The chemical composition control requirements of the steel are: 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 unavoidable impurity elements; and smelted in a 120t converter → RH furnace vacuum treatment → LF furnace refining → billet continuous The production steps of casting are carried out.

[0025] The end point C of the converter is controlled within the range of 0.06%~0.10%, and the end point temperature is 1650~1670°C; 300kg of high-carbon ferromanganese is added during the tapping process of the converter for alloying; When the vacuum reaches 0.27Kpa for 7-8 minutes, the carbon content in the steel drops to 0.002%~0.02% and the free oxygen content drops to 120~200ppm by sampling analysis; after the vacuum reaches 0.27Kpa, add 60~80kg of aluminum to the ste...

Embodiment 2

[0027] A method for manufacturing low-carbon and low-silicon steel. A 120t converter steelmaking plant manufactures Q195LB low-carbon wire drawing steel billets. The chemical composition control requirements of the steel are: 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; it is produced by the production steps of converter → RH furnace vacuum treatment → billet continuous casting, and the end point of the converter is controlled : C: 0.06%~0.10%, molten pool temperature: 1680~1700℃; 100kg of high-carbon ferromanganese alloying is added during the tapping process of the converter; the free oxygen content of molten steel before RH furnace vacuum treatment is 250~500ppm, RH vacuum treatment for 7-8min vacuum When the vacuum degree reaches 0.27KPa, the range of carbon and oxygen content in the steel is 0.010%~0.030%, 150~250ppm respectively. After the vacuum degree reaches 0.27Kpa, add 30~40kg aluminum...

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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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