A kind of slab continuous casting ordinary carbon steel molten steel treatment method
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A technology of slab continuous casting and processing method, which is applied in the field of iron and steel metallurgy, can solve problems such as insufficient improvement of castability, achieve good promotion and application prospects, improve castability, and ensure quality
Active Publication Date: 2019-01-04
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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Problems solved by technology
Aiming at the traditional solution to the problem of insufficient castability improvement during slab continuous casting of ordinary carbon steel, the present invention provides appropriate control of alloying, slag formation, and moderate oxygen activity in molten steel during the smelting and refining process. The process of feeding aluminum wire into molten steel can effectively control the level and state of inclusions in molten steel. It is easy to operate and control in the smelting and refining operation site, and can stably control the state of inclusions in molten steel, improving the continuous casting of this type of steel. The pourability of water ensures the quality of continuous casting products. Up to now, there is no proposal about adopting proper slag treatment, rational selection of deoxidizing materials, and accurate control of oxygen activity in the process of slab continuous casting common carbon steel molten steel. Degree (according to Al-Si-O relationship control [O]) process method
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Embodiment 1
[0027] Example 1: Treatment of steel grade Q235(G)
[0028] For the treatment of steel grade Q235 (G), the steel grade composition level requirements are: 0.13%-0.18% C, 0.15%-0.35% Mn, 0.10%-0.25% Si.
[0029] The implementation of the slab continuous casting common carbon steel molten steel treatment method is as follows:
[0030] The amount of molten steel is 133.5 tons, 345Kg of ferrosilicon and 347Kg of silico-manganese alloy are added during tapping, and 202Kg of lime is added during tapping (CaO content> 90%). After the furnace, the argon station determines the oxygen at 128ppm, feeds the aluminum wire 303g / t steel, and when the molten steel reaches the refining furnace, the temperature is measured at 1580°C, and the incoming samples are taken to test the composition of 0.14%C, 0.19%Mn, 0.12%Si, 0.003%Al, and add Refining slag (CaO content> 70%, CaF2> 10%, SiO 2 2 O 3 <7%) 151Kg, 15Kg aluminum particles, heating time 4 minutes, constant oxygen 48ppm, feed aluminum wire 95g / t ...
Embodiment 2
[0031] Example 2: Treatment of steel grade Q235-DG
[0032] For the treatment of steel grade Q235-DG, the basic requirements for steel grade composition: 0.13%-0.20%C, 0.10%-0.20%Mn, 0.10%-0.20%Si.
[0033] The implementation of the slab continuous casting common carbon steel molten steel treatment method is as follows:
[0034] The amount of molten steel is 129.31 tons, 283Kg of ferrosilicon and 237Kg of silico-manganese alloy are added during tapping, and 211Kg of lime is added during tapping (CaO content> 90%). The argon station at the back of the furnace determines the oxygen at 142ppm, feeds the aluminum wire 339g / t steel, and when the molten steel reaches the refining furnace, the temperature is measured at 1578℃. Refining slag (CaO content> 70%, CaF2> 10%, SiO 2 2 O 3 <7%) 102Kg, 17Kg aluminum particles, 71Kg ferrosilicon, heating time 6 minutes, constant oxygen 72ppm, feeding aluminum wire 157g / t steel, outbound constant oxygen 22ppm, temperature measurement is 1585℃, outbou...
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Abstract
The invention relates to a treating method for molten steel, especially to a treating method for molten plain carbon steel used for continuous casting of a slab, belonging to the field of ferrous metallurgy. To stably control the state of inclusions in the molten steel, improve castability of molten plain carbon steel for continuous casting and guaranteeing the quality of a product of continuous casting, the treating method provided by the invention employs the following concrete steps: A, tapping of molten steel: adding ferrosilicon and silicomanganese alloy during tapping of molten steel obtained through smelting of a primary smelting furnace and adding slag charge with CaO content of greater than CaO during tapping; B, argon blowing of an argon station for oxygen determination and feeding of aluminum wires; and C, LF refining: adding refining slag and aluminum particles into a finery, successively carrying out heating, oxygen determination feeding of aluminum wires and oxygen determination out of the station, and controlling the temperature of the molten steel so as to obtain the molten plain carbon steel used for continuous casting of the slab. The treating method provided by the invention improves tapping and alloying process and slagging control techniques so as to overcome the problem of poor castability of the molten plain carbon steel used for continuous casting, enhance the cleanness of the molten plain carbon steel and guarantee stable and smooth operation and economic benefits of continuous casting production.
Description
Technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a method for processing molten steel, in particular to a method for processing slab continuous casting plain carbon steel molten steel. Background technique [0002] Slab continuous cast carbon steel is widely used in various fields because of its economy and ease of processing. Therefore, it has a large production proportion in steel plants. The universal composition design feature of this type of steel is low carbon, low silicon, low manganese killed steel, the general basic composition range is [C]: 0.05%-0.20%, [Si]: 0.10%-0.50%, [Mn] 0.10%-0.65%. [0003] At present, for slab continuous casting general carbon steel, although the production volume of this type of steel is large, due to the low composition C and low Si in the steel, the molten steel is easy to reoxidize, and there are molten steel nodules during continuous casting and difficult to cast molten steel. ...
Claims
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Application Information
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