30 results about "Inclusion control" patented technology

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 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 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.

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 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 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 present application relates to the technical field of steelmaking continuous casting process, and particularly relates to a hot-rolled steel D-type inclusion control method and hot-rolled steel. The hot-rolled steel D-type inclusion control method converts traditional calcium-magnesium-aluminum-silicon complex oxides into high-melting-point magnesium-aluminum spinel through four-step cooperation of "aluminum deoxidization-high-alkali slag-vacuum aluminum control-magnesium modification", and makes the magnesium-aluminum spinel sufficiently float before solidification, so that the D-type inclusions are less than or equal to 0.5 level.

The application discloses a G115 heat-resistant steel continuous casting inclusion control method based on a double-layer ceramic filter, which comprises an electric arc furnace or converter steelmaking process, an LF furnace refining process, an RH or VD vacuum degassing process and a continuous casting pouring process; during the continuous casting pouring process, molten steel flows through a double-layer ceramic filter; wherein the upper layer of the filter adopts MgO-Al2O3 quality honeycomb ceramic with a pore size of 1.2-1.5 mm, and the surface of the upper layer is provided with a hexagonal boron nitride nano coating; the lower layer adopts ZrO2-CaO quality porous ceramic with a pore size of 0.3-0.5 mm, and the lower layer is internally provided with a La2O3 modifier; the application can effectively improve the inclusion removal rate, and the content of various inclusions in the continuous casting billet obtained by not adopting the method is reduced by more than 30%, so that the performance of the G115 steel is improved, including room temperature tensile, high temperature tensile and impact performance.

The invention discloses a production method of a 409L ultra-pure ferritic stainless steel 2B product for a closed water cooling tower, and belongs to the technical field of metal processing. The 409L stainless steel 2B product prepared by the invention comprises the following chemical components: less than or equal to 0.01 wt% of carbon, less than or equal to 0.01 wt% of nitrogen, less than or equal to 0.02 wt% of phosphorus, less than or equal to 0.002 wt% of sulfur, 11.5-11.75 wt% of chromium and 0.25-0.4 wt% of titanium. The mechanical property yield strength of the product is 232-244MPa, the tensile strength is 432-464MPa, the elongation rate is 32.8-33.4%, the hardness is HV130-138, the surface gloss is 428-453GU (20 degrees), and the neutral salt spray test reaches 560 hours. Through component setting, component segregation control, inclusion control and optimization and innovation of each process production process, the requirements of the material for the closed water cooling tower on corrosion resistance, welding performance, forming performance and surface quality are well met, and the product is high in cost performance, high in quality level and wide in market prospect.

This invention relates to the field of iron and steel metallurgy technology and discloses a clean smelting and inclusion control process for high-strength round link chain steel. The process includes S1 hot metal pretreatment, S2 converter smelting, S3 LF refining, S4 VD / RH vacuum refining, S5 continuous casting, S6 subsequent quality control, and S7 process monitoring and adjustment. Through clean smelting and precise inclusion control throughout the entire process, the total oxygen content of the high-strength round link chain steel is ≤25ppm, hydrogen content ≤2.0ppm, and sulfur content ≤0.008%; the A / B class inclusion level is ≤1.5, the D class inclusion level is ≤1.0, and there are no large inclusions larger than 50μm. The cleanliness of the molten steel meets the performance requirements for subsequent drawing, welding, and heat treatment, ensuring fatigue resistance and fracture toughness during chain use and reducing the risk of fracture induced by inclusions.

The invention discloses a processing technology of rare earth-containing high-performance alloy steel, and belongs to the technical field of processing of rare earth-containing modified high-performance alloy steel. The process comprises the steps of smelting and deoxidizing, rare earth peritectic denaturation, dynamic refining and inclusion control, a rare earth peritectic stabilization stage, intelligent control cooling and heating treatment, tempering and stabilizing treatment and the like. The rare earth alloy steel comprises the following components in percentage by mass: 0.35-0.55% of C; 0.15 to 0.35 percent of Si; mn: 0.55 to 0.85%; 0.80% to 1.30% of Cr; 0.15 to 0.35 percent of Mo; v: 0.05 to 0.10 percent; 0.02% to 0.05% of Nb; the rare earth (La + Ce + Y) is 0.015 to 0.045 percent; and the balance of Fe and inevitable impurities. Wherein the atomic ratio of La to Ce to Y is (2-3): (1-2): (0.5-1); the tensile strength of the alloy steel prepared through the technology is larger than or equal to 1450 MPa, the elongation is larger than or equal to 13%, the-20 DEG C impact absorbing energy is larger than or equal to 45 J, the hardness HRC is 38-42, and the technology is simplified in structure, low in energy consumption, high in rare earth utilization rate and suitable for preparing various kinds of high-performance alloy steel.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a cathode luminescence image-based rapid identification method for aluminum deoxidized steel inclusion components. The rapid identification method comprises the following steps: acquiring cathode luminescence images of the inclusions, judging the components of the inclusions according to the color difference of the cathode luminescence images, measuring the fractal dimensions of the inclusions with the same cathode luminescence color according to the contour of the inclusions in the cathode luminescence images, and determining the fractal dimensions of the inclusions according to the fractal dimensions. And color and fractal dimension information are combined to jointly judge the inclusion components. The rapid identification method is applied to aluminum deoxidized steel inclusion control, the steelmaking production condition can be rapidly judged, the harm of the inclusion is reduced, and the steel product quality is stabilized.

This invention relates to a medium-frequency furnace melting process for 316Ti material. This innovative process effectively solves the problems of high titanium loss rate and difficult inclusion control through the synergistic effects of full-process argon protection, pre-baking of ferrotitanium, two-stage addition of a specific composite refining agent, and strong stirring during final treatment. Compared with traditional methods, this invention can stably increase the titanium yield to over 92% and significantly improve the morphology and distribution of inclusions in the material, ultimately greatly enhancing the corrosion resistance and fatigue strength of 316Ti material. This process has strong adaptability, low overall cost, and is particularly suitable for the industrial production of high-quality special stainless steels.

The invention relates to the technical field of ferrous metallurgy, and discloses a C70S6 non-conditioned steel inclusion control smelting process which comprises the steps of S1, converter smelting, S2, LF furnace refining, S3, vacuum treatment and S4, continuous casting and casting. The LF furnace regulates and controls the alkalinity of a slag system in stages and optimizes a deoxidation process, vacuum treatment is matched to promote collision growth and floating of inclusions, continuous casting protects casting to avoid secondary oxidation, the number of non-metallic inclusions (sulfides and oxides) in molten steel is remarkably reduced, the size is refined, the sulfides are uniformly distributed in a spindle shape, and the content of oxide inclusions is reduced to an extremely low level; the core problem that the cutting performance and the expansion fracture performance are affected by inclusions in a traditional technology is effectively solved.

The utility model 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 application relates to the technical field of ultrahigh-strength steel materials, and particularly discloses a preparation method of an ultrahigh-strength SF1900 steel vacuum consumable ingot. The preparation method of the ultrahigh-strength SF1900 steel vacuum consumable ingot comprises vacuum induction melting, protective atmosphere electroslag remelting and vacuum consumable remelting. The application is produced by adopting a vacuum induction furnace + protective atmosphere electroslag + vacuum consumable furnace three-in-one smelting process, realizes comprehensive optimization of purity, inclusion control, composition uniformity and solidification structure, and improves the solidification structure, macrosegregation and chemical composition uniformity consistency of the ingot.

The invention discloses a 40Cr steel smelting process based on a synergistic effect of C deoxidation and rare earth. The 40Cr steel smelting process comprises the following steps: S1, after converter smelting, carrying out oxygen determination; s2, converter tapping; s3, carbon pre-deoxidation; s4, refining slag modification; s5, deoxidizing rare earth; and S6, carrying out secondary alloying. Aiming at a deoxidization method adopting deoxidization alloy in a 40Cr steel smelting process in the traditional industry and an existing deoxidization method adopting carbon powder deoxidization, the invention provides a method combining the clean deoxidization capability of carbon powder deoxidization and the deep deoxidization capability of rare earth, and the method is simple in process, high in operability and low in cost. The problem that in the background technology, the control difficulty of inclusions is large is solved.

The invention relates to the technical field of steel for cold heading, and discloses a method for optimizing nonmetallic inclusions of steel for cold heading, which comprises the following steps: S1, converter smelting impurity control, S2, LF refining slagging and inclusion removal, S3, RH / VD vacuum refining deep impurity removal, S4, inclusion control in a continuous casting process, S5, rolling and coping auxiliary impurity control, and S6, inclusion detection and verification. According to the method, the smelting source impurity control effect is remarkable, specifically, through molten iron pretreatment deep desulfurization (the sulfur content is smaller than or equal to 0.005%) and converter low-phosphorus and low-oxygen end point control (phosphorus is smaller than or equal to 0.012%, and post blowing is smaller than or equal to two times), the generation amount of sulfide and oxide inclusions is reduced by 30% or above; according to the method, the tapping slag amount is smaller than or equal to 5 kg / t steel through the double slag blocking technology, inclusion pollution caused by the fact that slag is involved in molten steel is avoided, the removal and denaturation efficiency of refined inclusions is improved, the LF furnace rapid slagging (white slag is formed within 20 min) and high alkalinity control (CaO / SiO2 = 3.5-4.5) are achieved, and the inclusion floating efficiency is improved by 40%.

This invention relates to the field of amorphous alloy smelting technology, specifically a manufacturing process for preparing amorphous ribbon. The process includes the following steps: precise batching, movable furnace top, top charging, electric arc furnace melting, strong oxidation, slag removal, reduction, eccentric EBT tapping (or VOD vacuum treatment), LF deoxidation and desulfurization, precise LF composition control, LF inclusion control (or VD vacuum treatment), LF temperature control, and ribbon spraying. The amorphous ribbon produced by this invention not only has fewer impurities and higher purity but also possesses excellent magnetic properties, effectively ensuring its quality and meeting the needs of high-end applications. The manufacturing process provided by this invention is the first in China to integrate smelting and ribbon spraying. Compared to existing technologies, it adopts a short-process electric arc furnace green production process, significantly reducing pollutant emissions, while also offering advantages such as high production efficiency, low cost, and superior quality.

This invention discloses a method for predicting the precipitation of inclusions in steel using the oxygen enrichment amount in the tundish, comprising the following steps: S1: Obtaining the oxygen content of the molten steel at the end of refining before continuous casting, denoted as O1, in ppm; S2: During continuous casting, obtaining the oxygen content of the molten steel in the tundish, denoted as O2, in ppm; S3: Calculating the oxygen content increase value Δ based on the results obtained in the above steps. O Δ O =O1-O2;S4: Based on the obtained oxygen content increase value Δ O This method predicts the amount of inclusions (Y) precipitated in steel during the smelting process. It obtains and calculates the oxygen content of the molten steel at the end of refining and in the tundish before continuous casting, calculates the difference between the two, and obtains the oxygen content increase from the end of refining to the tundish. Based on the obtained oxygen content increase value, it predicts the precipitation and purity changes of various types of inclusions in the steel corresponding to the current smelting process, providing a new approach and technical guidance for inclusion control in continuously cast billets.

This invention discloses a high-toughness, corrosion-resistant protective steel plate and its preparation method, belonging to the field of protective steel material preparation technology. It addresses the technical problem that the high-toughness, corrosion-resistant performance, and toughness of existing protective steel plates need further improvement. The invention first prepares a copper-nickel-chromium-aluminum-antimony alloy to establish a stable corrosion-resistant alloying foundation; then, it prepares a calcium-titanium-boron inoculant to improve the microstructure formation conditions during the solidification process of molten steel; simultaneously, it prepares a magnesium-aluminum-calcium regulating material to adjust the composition, morphology, and interface state of inclusions. The synergistic effect of these three materials makes the internal component distribution, microstructure evolution, and inclusion control of the steel plate more coordinated and continuous, thereby improving the microstructure uniformity, interface stability, and overall performance of the corrosion-resistant steel plate.