59 results about "Inclusion control" patented technology

The invention belongs to the technical field of steelmaking, and particularly relates to a process for smelting molten steel by adopting an RE-Si-Fe composite deoxidizer, which comprises the following steps: adding pretreated molten iron into a converter for smelting, and adding the RE-Si-Fe composite deoxidizer in the tapping process of the converter; and steel ladle top slag modification is carried out after steel tapping is completed. The RE-Si-Fe composite deoxidizer added in the converter tapping process can simultaneously exert the deoxidation and microalloying effects of rare earth in steel, stable reaction and retention of the rare earth in the steel are achieved while a good deoxidation effect is achieved, and inclusion control is facilitated. And the conventional calcium treatment operation for modifying the aluminum deoxidation product can be completely canceled, so that the production cost and the production treatment time of the smelting process are further reduced.

The invention provides an LF-RH duplex process calcium treatment method, and belongs to the technical field of steelmaking production in the ferrous metallurgy industry. The method comprises the following steps that after molten iron is pre-desulfurized, converter smelting, LF refining and RH refining are sequentially carried out, in the RH refining process, high-calcium wires are fed for calcification treatment, and the calcium treatment process is completed. Compared with the prior art, the LF-RH duplex process calcium treatment method provided by the invention adopts specific process steps and conditions to realize better overall interaction: by determining the optimal calcium treatment opportunity, the inclusion control level of the molten steel is improved, and clean production of the molten steel is realized. Experimental results show that calcium treatment is carried out in the RH procedure, the inclusion level in the molten steel is reduced, stable production of high-quality steel is achieved, under the condition that the hydrogen content is basically consistent, the effect of reducing the inclusion in the molten steel is good, and the cleanliness of the molten steel can be improved.

The invention discloses a smelting process for improving the cleanliness of Cr13 series steel by using rare earth refining slag, and belongs to the technical field of steel smelting. In order to improve the cleanliness of Cr13 series steel, the invention provides a smelting process for improving the cleanliness of the Cr13 series steel by using rare earth refining slag, which comprises the following steps: A, smelting by an electric arc furnace oxidation method; b, blowing by an AOD double-slag method; c, LF furnace refining, wherein slag auxiliary materials and RE2O3 are added, and LF slag comprises 32%-32% of Al2O3, 35%-45% of CaO, less than or equal to 6% of MgO, 8%-15% of SiO2 and 5%-20% of RE2O3; d, VD vacuum treatment; e, VD soft argon blowing; and F, pouring. By adding the rare earth oxide, the aluminum oxide inclusion activity in the slag is reduced, the inclusion control level of Cr13 series plastic die steel is improved, and the steel purity is improved.

The invention discloses a novel inclusion control method for ultra-pure steel, and relates to the technical field of steel production. The tapping oxygen content is controlled, and the tapping temperature is controlled; diffusion deoxidation is carried out in the refining slag melting process; a ferrotitanium core-spun yarn is fed before refining is finished; and the continuous casting tundish adopts an integral water gap, and full-protection pouring is carried out. According to the method, the number of oxide inclusions in steel is reduced, and the problems of large-size oxide inclusions and external inclusions caused by erosion of refractory materials easily occurring in a traditional process are solved.

The invention discloses a method for detecting the plane distribution of inclusions in the full thickness direction of an extra-thick continuous casting sheet billet. The position of the metallographic sample in the continuous casting slab is marked, and the inclusion of the metallographic sample is automatically analyzed, so that the detection result of the inclusion plane distribution of the whole extra-thick continuous casting slab in the thickness direction can be obtained. The position information of the inclusions is accurate, and the composition, number and size detection results of all kinds of inclusions are accurate, so that the composition, number and size distribution results of the inclusions in the full-thickness direction of the extra-thick continuous casting sheet billet on a specific plane can be accurately provided, and a foundation is laid for the improvement of an extra-thick continuous casting sheet billet inclusion control technology.

The present application relates to the technical field of steel metallurgy, in particular to a bottom-blowing gas-permeable brick for ladle refining and a refining method using the same, wherein the round-hole gas passages are arranged in rows and regularly distributed with the slit gas passages, the processing is simple, the material is saved, the argon gas has different bubble shapes after entering the molten steel through the bottom-blowing gas-permeable brick, and is not easy to gather, the utilization efficiency of the bottom-blowing gas is improved, the stirring effect on the molten steel is enhanced, the inclusions of various particle sizes are beneficial to be removed, the temperature and composition are uniform, and thus some steel grades with high requirements for inclusion control and element content can be better produced, and the refining efficiency is improved. Moreover, the arrangement mode of the bottom-blowing gas-permeable brick in the ladle is more beneficial to the stability of the airflow, the scouring to the ladle wall can be reduced, and the service life of the ladle is improved.

The invention discloses a pure steel smelting method for pure hydrogen conveying pipeline steel L245M. The adopted smelting process route comprises the steps of blast furnace-KR desulfurization-converter-LF refining-RH vacuum treatment-slab continuous casting. The pure hydrogen conveying pipeline steel L245M comprises the following chemical components in percentage by mass: 0.04 to 0.06 percent of C, 0.08 to 0.15 percent of Si, 0.90 to 1.15 percent of Mn, less than or equal to 0.013 percent of P, less than or equal to 0.0010 percent of S, 0.025 to 0.045 percent of Alt, 0.008 to 0.015 percent of Nb, less than or equal to 20ppm of O, less than or equal to 50ppm of N, less than or equal to 1.5 ppm of H and the balance of iron and inevitable impurities. The invention aims to meet the requirements of ultra-low S and P control and ultra-purity inclusion control of pure hydrogen conveying pipeline steel.

The application discloses a kind of silicon manganese calm high-carbon steel and its inclusion control method, converter low-carbon, high-oxygen tapping, deoxidation alloying when tapping 15%, using the strong oxidizing property of molten steel, first weak deoxidation alloy is added, Al, Ti brought in by alloy is all oxidized, finally low-titanium low-aluminum ferrosilicon final deoxidation alloying is added, after deoxidation alloying, acidic synthetic slag is added, then silicon carbide, low-alkalinity synthetic slag is added to form slag.Then it is transported to LF refining, after adjusting the composition and temperature of molten steel to reach the standard, it is treated by RH vacuum degassing and inclusion removal, and then continuous casting is carried out.The content of alumina, titanium oxide in refractory, synthetic slag, tundish covering agent, mold powder and the content of aluminum and titanium in alloy are strictly controlled.The application is extremely beneficial to control high-melting-point inclusions such as alumina, magnesium aluminate spinel and titanium oxide, and molten steel with extremely low brittle inclusion content is obtained, which is used for casting high-quality billet and producing high-machining-performance wire rod.

The invention relates to the field of metal processing, and discloses an intelligent metal processing waste collecting and oil mist filtering integrated device which comprises a waste collecting mechanism and a demisting unit, the waste collecting mechanism comprises a device body and a connecting piece, and the device body seals a waste outlet of metal processing equipment through the connecting piece; the waste liquid is prevented from escaping into the air to influence the air quality. The demisting unit is composed of a spraying assembly and a control assembly, the spraying assembly comprises a plurality of nozzles, and the nozzles are fixed to the inner wall of the connecting piece and communicated with a solution for accelerating oil mist sedimentation; the control assembly comprises a controller which is used for controlling the spraying operation of the spraying head. According to the device, the spraying assembly is used for spraying a solution into the connecting piece, the oil mist concentration is effectively reduced, oil mist dissipation is prevented, opening or closing of the spraying head is intelligently controlled through the controller, solution loss and waste liquid amount are reduced, and the dual purposes of environmental protection and resource saving are achieved.

The invention discloses a calcium aluminate inclusion control system and method and related equipment, and relates to the technical field of continuous casting, and the system comprises a control assembly which is used for generating a pulse current parameter instruction based on a target steel grade; the power supply assembly is used for receiving the pulse current parameter instruction sent by the control assembly to generate pulse current; the positive electrode assembly is arranged at the position away from the first side face of the crystallizer by a first preset distance and connected with the positive electrode of the power source assembly, and the crystallizer is used for containing molten steel corresponding to the target steel grade; and the negative electrode assembly is arranged at the position away from the second side face of the crystallizer by the first preset distance and connected with the negative electrode of the power supply assembly, and the first side face and the second side face are opposite side faces of the crystallizer. According to the calcium aluminate inclusion control system, inclusion inhibition is achieved, and increase of cost and environment burden is avoided while the cleanliness of IF steel is guaranteed.

The invention relates to the technical field of steel and iron material metallurgy, and discloses a bainite non-quenched and tempered steel Al-Ti-N component collaborative regulation and control process which comprises the steps of S1 raw material pretreatment, S2 smelting process, S3 refining process, S4 continuous casting process, S5 rolling process and S6 finished product inspection. AlN and TiN effectively pinning austenite grain boundaries to inhibit grain coarsening, VN disperses and precipitates to strengthen a matrix, so that the grain size of the steel is stable to be greater than or equal to level 5, a metallographic structure is mainly bainite and only contains less than or equal to 6% of ferrite, no obvious martensite harmful structure exists, the tensile strength reaches 900-1060 MPa, the yield strength is greater than or equal to 650 MPa, the impact energy (20 DEG C) is greater than or equal to 28 J, and the strict requirements of automobile key parts on obdurability are completely met; according to the process, the structure and production stability is remarkably improved, and sulfide inclusions and the gas content are reduced through precise impurity control and component control design of raw material pretreatment and smelting refining.

The invention relates to the technical field of ultrahigh-strength steel materials, and particularly discloses a preparation method of an ultrahigh-strength SF1900 steel vacuum consumable steel ingot. The preparation method of the ultrahigh-strength SF1900 steel vacuum consumable steel ingot comprises the steps of vacuum induction melting, protective atmosphere electroslag remelting and vacuum consumable remelting. According to the production method, the vacuum induction furnace, protective atmosphere electroslag and vacuum consumable electrode furnace triple smelting technology is adopted for production, comprehensive optimization of purity, inclusion control, component uniformity and solidification structures is achieved, and the consistency of the solidification structures, macrosegregation and chemical component uniformity of the steel ingots is improved.

This invention discloses a method for preparing high-temperature resistant aluminum alloy ingots based on smelting optimization control, relating to the field of aerospace aluminum alloy technology. The method includes the following steps: S1, obtaining smelting aluminum alloy raw materials, pre-treating the raw materials, and setting hard qualification index parameters for the target product. These hard qualification index parameters are divided into process safety and metallurgical performance categories. S2, obtaining the material properties of the aluminum alloy raw materials, using the material properties and hard qualification index parameters as inputs. This invention proposes a method for preparing high-temperature resistant aluminum alloy ingots based on smelting optimization control. Based on a customized differential evolution algorithm, it fully considers the strong coupling nonlinear relationship between active element burn-off, compositional segregation, brittle phase formation, and inclusion control during aluminum alloy smelting. Through a phased directional mutation search and a constraint-priority double-layer screening iterative rule, the uniformity of alloy composition is significantly improved.

This invention relates to the field of iron and steel metallurgy, particularly to a steel for track links in engineering machinery and its manufacturing process. The steel contains C, Si, Mn, Ca, Cr, Al, Ti, Nb, B, Mo, and N. The production process includes electric furnace smelting, LF ladle refining, RH vacuum treatment, continuous casting, heating, rolling, and cooling. Based on 15B36Cr steel, this invention increases the Cr content to 1.00%–1.20% to improve its wear resistance and increase the hardenability of the core of large-size track links. It also incorporates 0.020%–0.035% Nb to form a “B-Nb-Ti-Al” synergistic microalloying system. Simultaneously, it optimizes inclusion control by controlling Ca and sulfur content to ensure a calcium-sulfur ratio ≥1.5, thereby enhancing the steel's corrosion resistance and avoiding or reducing the risk of fracture.

The invention discloses a smelting method of weathering resistant steel SPA-H molten steel, and mainly solves the technical problems that the existing weathering resistant steel SPA-H molten steel is poor in castability, inclusions are difficult to control during smelting by using an argon blowing straight-up process, and the production cost is high. According to the technical scheme, the smelting method of the weathering resistant steel SPA-H molten steel comprises the following steps: (1) desulfurizing molten iron; (2) smelting by adopting a top-bottom combined blowing converter, and adding an alloy required by alloying of a copper element into the converter along with the scrap steel; 3) converter smelting process control; 4) converter smelting end point control; 5) converter tapping control; (6) refining in a molten steel argon blowing station to adjust the temperature of the molten steel to 1580-1595 DEG C; aluminum wires are fed into the molten steel; weak stirring is conducted on the molten steel fed with the aluminum wire, and the molten steel is slightly stirred for 5-6 minutes; and then adding a titanium-iron alloy, and continuing to slightly stir the molten steel for 2-3 minutes to obtain finished molten steel. The molten steel produced by the method is directly conveyed to a continuous casting machine for casting, and the number of continuous casting furnaces is larger than or equal to 12.

The invention particularly relates to a method for controlling the argon blowing flow of a continuous casting ladle long nozzle, and belongs to the technical field of molten metal treatment through gas. According to the method, the argon blowing flow is automatically adjusted according to the argon blowing state, the argon blowing flow is reduced under the condition that argon protection casting of the long nozzle is guaranteed, and the steel passing amount of the long nozzle and the molten steel inclusion control level are improved. According to argon blowing state judgment, the historical argon blowing flow of actual production of the continuous casting machine and corresponding pipeline back pressure data are adopted, the method has universal adaptability to different continuous casting machines, and the method can be popularized and used only by adjusting the regression coefficient and the deviation coefficient. The argon blowing flow of the large ladle long nozzle is automatically calculated in a set time period, and the calculation result is transmitted to the field, so that automatic control of the argon blowing flow of the large ladle long nozzle can be realized.

The application discloses a kind of based on crystallizer electromagnetic stirring bar surface inclusion control method, belong to steel metallurgy continuous casting and rolling technical field.The method first establishes the finite element model of multiple pass rolling process from continuous casting billet to target bar, and using node reverse tracking technology, the specific area of continuous casting billet that has decisive influence on bar surface quality is determined as target clean control area.Subsequently, the multi-physics field coupling model of flow, solidification and inclusion movement in crystallizer is constructed, and the installation position of crystallizer electromagnetic stirrer that can make the inclusion capture probability in target clean control area be reduced to the lowest is determined as the optimal process position by simulation analysis.Finally, electromagnetic stirrer is installed according to this position in actual continuous casting production and production is carried out.The application realizes accurate targeted control of cleanliness of key area of continuous casting billet from the requirement of final product quality, and significantly improves the surface quality and service performance of high fatigue requirement steel such as bearing steel.

The invention discloses a control method for improving the purity of molten high-carbon steel, which comprises the following steps: smelting in a converter until the end-point carbon content is less than or equal to 0.06% and the phosphorus content is less than or equal to 0.012%; alloying is carried out in the tapping process, the alloying sequence is silicon-manganese-aluminum, and a carburant is not added; molten steel tank bottom argon blowing is started in the tapping process, molten steel tank clearance is controlled in the tapping process, and slag stopping tapping is adopted in the last stage of tapping; adding a modifier into the molten steel tank after tapping; after tapping, a steel car is driven to a receiving position, molten iron is mixed into a steel ladle through a crane, and then a molten steel tank is started to blow argon at the bottom; the molten steel is lifted to a slagging-off position, and solidified slag is removed; molten steel obtained after slagging-off is fed into an LF for refining, slagging and desulfuration are conducted, and pouring is conducted on a machine after the component temperature is qualified. According to the method, inclusion control is achieved through molten iron recarburization and molten steel slagging-off, effective control over low inclusions of high-carbon steel can be achieved under the condition that a vacuum degassing device does not need to be additionally arranged, the purity of the molten steel is improved, consumption of a recarburizing agent is reduced, the smelting cost is reduced, and the quality of the molten steel is improved.

This invention discloses a method for manufacturing low-temperature rare earth alloy steel rails that suppresses the formation of network ferrite in the rail web. With the homogenization of the rail web microstructure as the core control objective, under industrialized process conditions of converter-LF-VD-continuous casting-rolling-online heat treatment, the method suppresses the tendency for network ferrite formation in the rail web through post-rare earth purification and inclusion control, gas control, confinement of billet center segregation and rail web alignment, and matching control of online heat treatment cooling capacity (cooling pressure / equivalent cooling rate). This ensures the long-term stability of the rail's low-temperature impact toughness, strength, and hardness. This invention forms a feasible manufacturing and acceptance closed loop with "post-rare earth purification + gas / residual element control + continuous casting centerline C threshold (rail web alignment) + online heat treatment cooling pressure matching (driving rail web cooling rate)" as the core control chain.

The invention relates to a method for controlling the form of non-metallic inclusions in tire cord steel, which comprises the following steps: 1) controlling the components of molten steel: preparing a Fe-Si-Mg-Al quaternary alloy and adding the Fe-Si-Mg-Al quaternary alloy in the form of a cored wire; (2) controlling a refining slag system; and the refining slag system comprises the following components: w (CaO) / w (SiO2) = 0.8-1.2, w (MgO) = 6-9%, and w (Al2O3) is less than 10.0%. According to the tire cord steel quality control requirement, the powerful non-metallic inclusion control function of magnesium metal and the converter-refining-continuous casting production technology are combined, the tire cord steel non-metallic inclusions are controlled from the two aspects of tire cord steel molten steel component control and refining slag component control, and the tire cord steel quality is effectively improved.

The invention discloses an inclusion control method for ultra-high strength spring steel. In the process of steel tapping from a converter, the molten steel is deoxidized while slag washing and desulfurization are performed with high basicity slag. Then, the desulfurized slag generated by the slag washing in the steel tapping process is removed. After the slag is removed, the ladle is hoisted into an LF refining station, lime and river sand are added to perform slag making operation. In the refining process, 85SiC particles are diffused to form refined slag with low melting point, good fluidity and low oxidizability. The inclusions in the steel are controlled to be low melting point, small size, small number and small influence on fatigue life. The rating of each type of inclusions does not exceed level 1.0, and the total oxygen content TO in the steel does not exceed 15ppm.

The invention relates to the technical field of steel and iron smelting, and provides a tire cord steel low-melting-point plastic inclusion control method which comprises the following steps: S1, pretreatment: pretreating molten iron to obtain molten steel; s2, smelting: after the molten steel is smelted, tapping to obtain smelted molten steel; s3, refining: carrying out component adjustment on the smelted molten steel, and carrying out slagging, deoxidation and soft argon blowing treatment to obtain refined molten steel; s4, continuous casting: continuously casting the refined molten steel to obtain tire cord steel; during tapping, a modifier is added, and the modifier comprises, by weight, 30-40 parts of sodium fluoride, 10-20 parts of calcium oxide, 10-35 parts of a ferrous compound and 3-6 parts of cryolite; based on the weight of the molten steel, the adding amount of the modifier is 1-2 kg / t. According to the technical scheme, the problem that the content of Al2O3 in the inclusion of the tire cord steel in the related technology is high is solved.

The invention relates to the technical field of SPHC continuous casting sheet preparation, in particular to an SPHC continuous casting sheet billet aluminum oxide inclusion control technology which comprises the steps that all component raw materials of an SPHC continuous casting sheet billet are smelted, and the instantaneous interference degree is obtained according to the temperature difference distribution and the temperature difference trend of the molten steel temperature and the tapping temperature in the smelting process; analyzing the correlation between the temperature difference between the molten steel temperature and the tapping temperature and the modal characteristics of the instantaneous interference degree, and obtaining the tapping interference enhancement degree in combination with the average level of the instantaneous interference degree; the method comprises the following steps of: obtaining interference continuity by combining the variation trend characteristic of tapping interference enhancement degree, setting a compensation factor by utilizing the interference continuity to obtain an expected error between an actual tapping temperature and a preset expected tapping temperature in a smelting process, controlling the tapping temperature of molten steel, continuously casting a steel ladle, roughly rolling and finely rolling to obtain a forging stock, and further obtaining the SPHC continuous casting sheet billet. According to the method, the preparation quality of the SPHC continuous casting plate can be improved.

The application discloses a method for controlling large-size liquid inclusions in a LF refining stage, comprising the following steps: S1: obtaining the O content, Ca content and Al content in molten steel in the LF refining process; S2: calculating the large-size liquid inclusion index Y of the molten steel by using formula (I); and S3: controlling the O, Ca and Al contents according to the calculated large-size liquid inclusion index Y. According to the inclusion control characteristics of multiple steel types, the O, Ca and Al contents are accurately controlled in the refining stage, 100% of the large-particle spherical oxide Ds-type inclusions are controlled to be less than 19 microns, the Ds-type inclusion is less than or equal to 0.5 level in the GB / T 10561-2023 'Standard Grading Diagram Microscopic Test Method for Determining Nonmetallic Inclusion Content in Steel', and the large-size liquid inclusion is accurately controlled.

The invention belongs to the technical field of steel and iron smelting, and discloses a smelting process of high-manganese wear-resistant steel, after blast furnace molten iron is pretreated by a dephosphorization converter, the P content of the molten iron is smaller than or equal to 0.007%, the C content of the molten iron is larger than or equal to 2.8%, then mother liquor is added into an AOD converter for smelting, and the smelting process comprises a Si / Al removal stage, a main decarbonization stage, a dynamic decarbonization stage, a manganese alloying stage, a reduction stage and a tapping stage. By utilizing the dynamic conditions of efficient decarburization of AOD top side combined blowing and side blowing strong stirring, the manganese yield reaches 98% or above, the effect of decarburization and manganese protection is achieved, and the molten steel inclusion control level is far higher than that of a BOF converter. Compared with a KR desulfurization, BOF converter, LF (temperature rise), VD (vacuum decarburization) and LF process, the high-manganese wear-resistant steel is smelted by adopting a dephosphorization converter (DP), AOD converter and LF process, so that the smelting process is short, and the cost is low.

The application discloses a kind of inclusions control method of sulfur-containing aluminum control steel smelting, including S1, electric furnace tapping: aluminum block, alloy, lime, refining slag are sequentially added;S2, LF refining: control refining end point target slag system is: basicity R: 2~3.5, Al2O3: 7%~13%, TFe≤0.5%;S3, VD vacuum refining: molten steel is to station after blowing nitrogen gas and increasing nitrogen, after breaking vacuum, argon gas is blown and stirred, and after breaking vacuum, the feeding sequence of wire is silicon nitride wire, calcium wire, aluminum wire, titanium wire and sulfur wire;S4, large square billet continuous casting.The application has the advantages of effectively reducing the number of high melting point inclusions, improving the purity of molten steel, realizing multi-furnace continuous casting of molten steel, improving production efficiency and stably improving product quality.

The utility model discloses an integrated device for deeply squeezing, filtering and dewatering sludge, which relates to the technical field of sludge treatment, and comprises a buffer tank, a filtering mechanism, a water tank, a water outlet pipe, a water inlet pipe, a water outlet pipe, a water inlet pipe, a water outlet pipe, a water outlet pipe and a water outlet pipe, and the top surface of the buffer tank is provided with a buffer tank for storing treated sludge; the filtering mechanism comprises a filter cartridge for filtering sludge, and the interior of the filter cartridge is fixedly communicated with a feeding pipeline; the squeezing mechanism is used for squeezing the sludge, the squeezing mechanism is located above the filter cartridge, the squeezing mechanism comprises an electric telescopic rod, and a pressing disc for squeezing the sludge in the filter cartridge is fixedly arranged on the bottom surface of the electric telescopic rod; the control mechanism is positioned at the bottom of the filter cartridge and comprises a sealing plate for controlling the opening or closing of the bottom of the filter cartridge. The sludge deep squeezing, filtering and dewatering integrated device can filter and dewater sludge, facilitates collection of dewatered sludge, and is convenient to operate and high in working efficiency.

The present invention discloses a reinforcement laying method for underground filling in a mine, wherein a two-layer foldable main and secondary reinforcement steel mesh prepared on the surface is transported and loaded and unloaded to the working face by a special false bottom reinforcement laying trolley, and a single steel mesh is arranged according to the specifications of the mining site, and the single steel mesh is manually assembled through special connecting buckles. The special reinforcement laying trolley includes a control system, an electric system, a driving system, and a reinforcement grabbing system. When the trolley is laying an artificial false bottom, it can lay a modular two-layer steel mesh on pre-leveled slag. One vehicle can quickly realize the reinforcement laying of the entire artificial false bottom of the approach, which is convenient for subsequent concrete pouring or filling operations, and mechanizes the reinforcement laying of the artificial false bottom of the downward approach filling mining method, which has the advantages of fast laying speed, safety, and programming, greatly reduces the labor intensity of workers, shortens the bottom laying time, and improves the production efficiency of the downward approach filling mining method.

The invention discloses a Q355B series aluminum-containing steel grade deoxidation post-treatment method, which belongs to the technical field of metallurgy, and comprises the following steps: converter tapping pre-deoxidation: in the converter tapping process, sequentially adding silicon manganese alloy, silicon iron, lime and carbon powder for pre-deoxidation; lF refining deep deoxidation: after the molten steel reaches an LF furnace, performing oxygen determination analysis, and adding aluminum blocks, aluminum wires and aluminum particles for deep deoxidation according to an oxygen content calculation result; in the LF refining process, the total adding amount of lime is controlled to be 1400 kg / 200 tons of steel, and the argon blowing stirring time is optimized to be 180 s; inclusions are controlled, specifically, low-melting-point MnO-SiO2 composite oxide is generated through silicon-manganese and silicon-iron pre-deoxidation, the average size of B-type inclusions is reduced to a first target value, and the area proportion is reduced to a second target value. According to the method, joint optimization of deoxidation, desulfurization and inclusion control is achieved in a post-deoxidation mode of'silicon-manganese and silicon-iron pre-deoxidation + LF aluminum deep deoxidation '.

The invention discloses an inclusion control method for low-basicity slag pure steel. By optimizing the process links such as steel tapping oxygen content, steel tapping temperature control, ferrosilicon and alloy addition mechanism, LF refining end oxygen content, tundish setting, etc., the formation of large-sized inclusions in the pouring process is reduced, thereby reducing the total oxygen content and fracture inclusion size of the produced rolled material, and the purity of the steel is greatly improved.