1269 results about "Steelmaking" patented technology

The invention discloses a molten steel element content on-line detection system based on a laser-induced breakdown spectroscopy technology, and relates to the technical field of molten steel element content on-line detection, the molten steel element content on-line detection system comprises an excitation system, an acquisition system, a data preprocessing module and a component detection module; the excitation system is used for emitting laser to the molten steel surface to generate plasma; the acquisition system is used for collecting signal light radiated by the plasma; the data preprocessing module is used for carrying out baseline correction and noise reduction processing on the collected original spectral signals; and the component detection module comprises an element content prediction model based on a gating specific expert attention network LSEA-Net and is used for carrying out quantitative analysis on the preprocessed spectral data to obtain the element content of the molten steel. The technology has the advantages that sample preparation is not needed, online rapid analysis and multi-element synchronous detection are achieved, and the technology is suitable for the high-temperature environment and the like, and the requirement of a steelmaking site for real-time component detection is met very well.

The invention provides a method for making foam slag in LF (ladle furnace) refining by using a waste graphite electrode, which specifically comprises the following steps: grinding the waste graphite electrode to obtain graphite electrode powder, and adding limestone as a foaming agent in the LF refining. 0-1.25 kg / t of steel limestone is added firstly, and 0.018-0.19 kg / t of steel graphite electrode powder is added every 2 min. Compared with the prior art, by utilizing the characteristics of high carbon content, high conductivity and low sulfur of the graphite electrode, the invention aims to realize submerged arc heating, reduce power consumption and shorten refining time so as to meet the requirement of continuously increasing LF smelting indexes under the high-quality development trend of steelmaking.

The invention belongs to the technical field of ironmaking and steelmaking, and particularly discloses a direct reduction iron production process and system of variable feed gas. The production process comprises the following steps: under a basic working condition, a hydrogen-rich working condition or an all-hydrogen working condition, introducing high-temperature reducing gas into a shaft furnace to produce the direct reduced iron; the production system comprises a shaft furnace, a self-heating modification device, an upgrading device, a heating furnace and a preheating furnace, and is provided with three hydrogen supplementing points and two hydrogenation points. By changing the structure of the raw material gas, supplementing hydrogen at three positions or supplementing or adding hydrogen at at least one of two hydrogenation points, increasing the H2 content of the reducing gas at the inlet of the shaft furnace and the like, the carbon emission, the process energy consumption and the pellet reduction difficulty are reduced.

The invention relates to the technical field of carbon detection, in particular to an online real-time dynamic detection method for the carbon content of converter steelmaking molten steel, which comprises the following steps: acquiring multi-source sensing data, and acquiring a molten steel surface temperature image acquired by a thermal infrared imager; acquiring multiband spectral data, namely controlling a visible band sensor to acquire radiation intensity in a range of 500-600nm, and controlling a near-infrared band sensor to acquire reflectivity characteristics in a range of 850-1100nm; analyzing and fusing the data, analyzing the temperature image, and generating a molten pool two-dimensional temperature field; analyzing the multiband spectral data, and extracting a spectral feature vector related to the carbon content; fusing the two-dimensional temperature field and the spectral feature vector, and generating a molten steel surface carbon content distribution diagram based on a pre-trained carbon content machine learning model; and outputting an optimized detection result, processing multi-node data through a distributed computing framework, and outputting a dynamic carbon content detection report. According to the invention, the effects of breaking through the limitation of traditional static detection, real-time component monitoring, full molten pool covering and dynamic feedback are achieved.

The utility model relates to the technical field of bearing disassembly metallurgy vehicle automatic joint devices, in particular to a double-four-connecting-rod lifting steel ladle bottom argon blowing automatic joint device which comprises a bottom argon blowing arc-shaped male joint, a high-temperature-resistant seal and a supporting frame, and the bottom argon blowing arc-shaped male joint is arranged above a fixing rod and can slide up and down. The device is characterized in that a four-connecting-rod lifting mechanism is arranged in the supporting frame, and the four-connecting-rod lifting mechanism is connected with the fixing rod; the bottom argon blowing arc male connector and the fixing rod are directly provided with a compression spring. The utility model has the advantages that: firstly, the spherical guide of the male connector is utilized, the sealing connection of the conical spring is reliable, the ladle car can be transformed and used on the basis of the original ladle car, the manufacturing cost is low, the sealing is reliable, steel slag blocks can conveniently flow down along the conical surface, the conical surface sealing is not easy to remain steel slag, and the conical surface is firmly matched without air leakage; and secondly, the device is simple in structure and convenient to transform and install, the working intensity of the bottom argon blowing joint of a maintainer is reduced, and the steelmaking labor productivity is improved.

The invention discloses a strong coupling process prediction method based on large model fine tuning, and relates to the technical field of industrial process intelligent optimization, and the method comprises the steps: S1, carrying out the cleaning, coupling feature extraction, time sequence standardization and VAE small sample enhancement of strong coupling process original data, and obtaining standardized time sequence data; s2, selecting a Transform architecture industrial time sequence pre-training large model as a base model; s3, through a layered freezing-fine tuning mechanism, freezing a bottom-layer general knowledge layer, performing fine tuning on a middle-layer coupling feature adaptation layer and a top-layer multi-branch output layer, and completing model adaptation in combination with a weighted loss function containing a coupling constraint regular term; and S4, inputting data to obtain a prediction result, and realizing rapid iteration of the model through increment fine tuning. The method is suitable for strong coupling scenes of chemical engineering, metallurgy and the like, an iron-making and steel-making process is taken as an experimental case, the predicted MAE of the molten iron temperature reaches 9.2 DEG C, the predicted MAE of the carbon content of the molten steel reaches 0.012%, the generalization accuracy rate is 93%, the prediction precision and the industrial suitability are remarkably improved, and the production energy consumption and cost are reduced.

The invention discloses a steelmaking converter carbon brick masonry hoisting device and a use method thereof.The steelmaking converter carbon brick masonry hoisting device cooperates with a steelmaking converter body and a steelmaking converter workshop oxygen lance replacement electric hoist for operation, and comprises a lifting unit, a conveying unit, a construction platform unit and a transportation trolley; the auxiliary function assembly is integrated on all the units to achieve precise limiting, safety protection and automatic control, and the lifting unit is specifically arranged on the outer side area, corresponding to a furnace body gate, of a steelmaking converter platform. The U-shaped limiting assembly is arranged at the top of the lifting unit, the first positioning baffle and the second positioning baffle define the U-shaped groove matched with the transport trolley in width, the length difference value of the first positioning baffle and the second positioning baffle is consistent with the height of the transport trolley, the upper portion and the lower portion of the trolley can be limited, and deviation in the transfer process is avoided; the first buffering protection pad and the second buffering protection pad arranged on the U-shaped limiting assembly can effectively absorb impact force generated when the trolley makes contact with the baffle, and structural deformation and carbon brick collision damage are prevented.

The invention relates to a steelmaking multi-process dust removal coordinated control system in a big data environment, and the system comprises a data collection module which is used for collecting the dust removal data of a converter smelting process, a converter tapping process, a steel ladle transportation sedation process, a steel ladle refining process and a molten steel casting process in real time; the big data platform is used for constructing a CDH multi-server cluster, processing second-level real-time process data by adopting Flink, performing real-time data processing and operational analysis, and storing dust removal related data through HBase; the dust removal valve state monitoring module is used for monitoring the state of each dust removal valve; the automatic reminding and adjusting module is used for automatically recognizing abnormal or non-optimal configuration of the valve state based on big data analysis and optimizing the dust removal process by reminding or automatically adjusting the valve state; the energy-saving analysis model is used for calculating energy consumption under different configurations; and the intelligent control system integrates an intelligent control algorithm, automatically adjusts the state of the valve according to the result of the energy-saving analysis model, and realizes intelligent control of the dust removal process.

The invention discloses an application method of a data model in prediction of converter steelmaking static oxygen supply. The method comprises the following steps: S1, steelmaking converter whole-process data preprocessing; s2, making a data model; s3, deploying the data model online; and S4, the converter L2 process control online system calls the data model online. A data set covering the whole converter steelmaking process is manufactured, a data model is trained on the basis of the data set, the trained data model is deployed on a reasoning server in a containerization mode, a converter L2 system transmits heat characteristic data through an API interface, then an oxygen amount calculation model is remotely called, and on the basis of achieving static oxygen supply amount prediction, the oxygen supply amount of the converter is predicted. And the purpose of improving the prediction precision is achieved.

The embodiment of the invention provides an electric furnace steelmaking prediction model training method and device, electronic equipment and a storage medium, and relates to the technical field of electric furnace steelmaking, and the method comprises the steps: collecting historical electric furnace steelmaking data, cleaning the historical electric furnace steelmaking data to obtain first electric furnace steelmaking data, labeling the first electric furnace steelmaking data, and obtaining a second electric furnace steelmaking prediction model; performing feature extraction on the second electric furnace steelmaking data to obtain a plurality of features, acquiring features meeting process conditions from the plurality of features to obtain a plurality of target features, and training a to-be-trained electric furnace steelmaking prediction model by taking each target feature as a training set to obtain a trained electric furnace steelmaking prediction model; and obtaining a trained electric furnace steelmaking prediction model. Accurate control over the electric furnace steelmaking process can be achieved, the smelting period is shortened, and the molten steel quality is improved.

The utility model belongs to the technical field of cleaning of oxide scales on the surfaces of steel billets, and discloses equipment for cleaning and recycling oxide scales of steel-making steel billets, which comprises two side plates, a steel billet roller way is arranged between the two side plates, and a fixed support is fixedly mounted at the top ends of the two side plates. An electric push rod is fixedly installed in the fixed support, the output end of the electric push rod is fixedly connected with a supporting frame, a first steel wire roller is rotationally connected between the inner walls of the supporting frame, movable frames are symmetrically and slidably installed in the two side plates, and steel plates are fixedly connected to the opposite ends of the two movable frames. The first steel wire roller and the second steel wire roller are designed above the steel billet roller way, so that the high-temperature-resistant first steel wire roller and the high-temperature-resistant second steel wire roller are in rolling contact with steel billets in the steel billet conveying process of the steel billet roller way, oxide scales on the steel billets are removed, and the subsequent steel billet machining quality and efficiency are guaranteed.

The invention discloses an efficient and low-cost high-strength steel plate for a 1300MPa-grade low-temperature engineering structure and a manufacturing method of the high-strength steel plate, and belongs to the technical field of low-carbon microalloyed steel production. Optimized steelmaking, heating, rolling, pre-straightening, relaxation, controlled cooling, hot straightening and tempering processes are adopted, an ultra-fast cooling and laminar cooling mode is adopted for controlled cooling, chemical components of the steel plate contain Ce, and finally the problems that the 1300MPa-level hot-rolled steel plate with the thickness of 10-50 mm produced through an online cooling process is low in toughness, high in yield ratio, low in flaw detection qualification rate and uneven in plate shape are solved.

The utility model relates to a converter mouth purging device in the converter tapping process, and belongs to the technical field of converter steelmaking in the metallurgical industry. According to the technical scheme, one end of a large rotating arm (4) is rotationally connected to a stand column (1) through a rotating body and a rotating body support, the other end of the large rotating arm (4) is rotationally connected with one end of a small rotating arm (13) through the rotating body and the rotating body support, a universal support (11) is rotationally connected to the other end of the small rotating arm (13) through the rotating body, a positioning sleeve (10) is arranged on the universal support (11), and the positioning sleeve (10) is connected with the stand column (1). The stainless steel purging pipe (7) penetrates through the positioning sleeve (10), one end of the stainless steel purging pipe (7) is connected with the nozzle (5), the other end of the stainless steel purging pipe (7) is connected with the elbow (14) and the control handle (15), and the elbow (14) is connected with the metal hose (16) through the quick connector (17). The device has the beneficial effects that bonded slag or steel at the converter mouth can be automatically, safely and efficiently cleaned, and the normal operation of the converter is ensured.

The invention relates to the technical field of steelmaking, in particular to a method for quickly detecting the non-uniformity of a flow field of a continuous casting crystallizer on line, which comprises the following steps of: acquiring a signal in a hydraulic vibration device of the crystallizer, converting the signal into a digital signal, and preprocessing the digital signal as time sequence synchronization data; the method comprises the following steps: slicing time sequence synchronization data according to a fixed time window, extracting multi-dimensional features from data in each time window, and constructing feature vectors; performing flow field evaluation by adopting a mixed model combining supervised learning and unsupervised learning; and outputting an alarm level prediction and diagnosis mode by using the multi-task learning model. An original signal capable of directly or indirectly reflecting a flow field state is acquired at high frequency through a multi-source sensor array arranged on a crystallizer; extracting characteristic values strongly related to the characteristics of the flow field by using a signal processing technology; inputting the characteristic value into a pre-trained deep learning neural network model; the model outputs a comprehensive evaluation index about the uniformity of the flow field in real time, and automatically identifies a non-uniform mode and grade.

The invention belongs to the technical field of steelmaking, and relates to a method for controlling large-size inclusions in silicon-aluminum deoxidized steel. Converter tapping adopts a silicon-aluminum deoxidation process, after tapping, high-oxidability slag is removed by adopting a slagging-off process, and then high-reducibility premelting refining slag is added for re-slagging, so that the slag (TFe + MnO) at most of the refining moments is maintained within 0.50%; in the refining process, the stirring strength is controlled to control the desulfurization rate of the refining slag within 50%, so that the slag entrapment degree of the refining slag is reduced to the maximum extent; two iron sheets with the thickness being 2 mm are placed on the liquid level of the slag in advance before RH vacuum treatment, it is guaranteed that the slag is prevented from being drawn into the dip pipe in the process that the dip pipe is inserted into the molten steel, soft blowing is conducted for 10-15 min after RH vacuum treatment, then argon is closed, and the molten steel is subjected to standing for 20-30 min. By the adoption of the smelting process, the product rejection rate caused by large-size inclusions is reduced to be within 2%.

The invention relates to the technical field of research and development of low-temperature bolt steel, and discloses a low-temperature impact performance control process for low-temperature bolt steel. Comprising the steps that S1, in the steelmaking refining stage, purity and uniformity control is conducted, S2, casting blank homogenization treatment is conducted, stress relief and structure regulation are conducted, S3, a heat treatment core process is conducted, structure and toughness balance regulation is conducted, and S4, online detection and dynamic feedback are conducted, and performance stability is guaranteed. By accurately controlling the element proportion of carbon (C), silicon (Si), manganese (Mn), chromium (Cr) and molybdenum (Mo) in steel and combining with an optimized heat treatment process (such as 860 DEG C oil quenching and 640-650 DEG C high-temperature tempering, and the heat preservation time is prolonged to 120 minutes or more), the V-shaped notch impact energy of the material in the environment of-101 DEG C stably reaches 35 J or more, the impact energy of part of samples can reach 50 J or more, and the impact energy of the part of samples can reach 50 J or more. The problem that the low-temperature impact performance is insufficient after wire hardening and tempering is thoroughly solved, and it is ensured that the brittle failure resistance of the bolt is remarkably improved in the ultralow-temperature environment.

The utility model discloses a central water treatment filtering device for desalted water production. A raw water inlet pipe of a reservoir is communicated with a water inlet pipeline of each filter; the ultrafiltration processors are connected in series; a water outlet of each filter is communicated with a water inlet pipeline of the first-stage ultrafiltration treater; a water outlet of the N-stage ultrafiltration treater is communicated with a water inlet pipeline of the filtered water storage tank; a water outlet of the filtered water storage tank is communicated with a water inlet pipeline of the primary reverse osmosis processor; all stages of reverse osmosis processors are connected in series, and water outlets of the N stages of reverse osmosis processors are communicated with a demineralized water storage tank pipeline. According to the device, the content of various pollutants in water entering the ultrafilter can be reduced, a filter element for ultrafiltration and reverse osmosis can be protected, the content of various impurity ions in the water after ultrafiltration is reduced, the conductivity of produced water is about 10 us / cm, the hardness is 0.01 mol / L or below, the produced water is used for supplementing water for a steelmaking and steel rolling heating furnace, and generated steam can be used for power generation of a steam turbine. Water consumption is reduced, resources are saved, and the accumulation speed of scale in the boiler is effectively reduced.

The invention discloses a refining calcium-free treatment process, and belongs to the technical field of refining and smelting of high-carbon aluminum-containing steel. According to the method, various smelting parameters of the whole steelmaking process are adjusted, sulfur entering a converter is guaranteed in a desulfurization area, tapping carbon, tapping temperature, in-place refining component hit rate, deoxidation degree and tapping phosphorus difference are guaranteed in a converter area, refining treatment time, white slag protection time and soft blowing time are guaranteed in a refining area, the content of Al2O3 in molten steel is reduced, the purity of the molten steel is guaranteed, and the quality of the molten steel is improved. Molten steel calcium-free treatment is achieved, and the quality of molten steel is improved.

The application discloses a high-phosphorus molten iron extremely-low-sulfur and low-phosphorus hydrogen-doped pipeline steel steelmaking process control method, which reduces the burden of LF desulfurization through post-furnace slag system treatment, effectively improves the refining rate, improves the production efficiency and guarantees continuous casting through over-treatment or re-treatment of LF refining; compared with conventional production, the desulfurization efficiency is improved through converter slag system and LF refining slagging process, the cleanliness of the steel is also greatly improved, and the final total oxygen content can be stably controlled within 0.0015%. The application aims to provide a steelmaking process control method for realizing low-phosphorus and extremely-low-sulfur chemical composition in the process of smelting hydrogen-doped pipeline steel from high-phosphorus molten iron, especially for smelting low-phosphorus steel and extremely-low-sulfur steel from high-phosphorus molten iron, the cleanliness of the steel is also greatly improved, and the final total oxygen content can be stably controlled within 0.0015%.

The present application relates to a kind of small square billet sulfur titanium-containing welding wire steel and its preparation method, belong to the technical field of steelmaking.The converter smelting process, refining process and continuous casting process, specifically are as follows:in the converter smelting process, tapping is carried out using aluminum block, ferrosilicon, silicon manganese deoxidation alloying, pre-slagging is carried out by adding lime, after tapping is finished, the total mass content of FeO and MnO in slag is controlled≤2.5%;In the refining process, lime, calcium carbide and aluminum particles are added for slagging and diffusion deoxidation, after slagging is finished, the slag basicity is controlled to be 2.5~3.0, the total mass content of FeO and MnO in slag is≤0.5%, the total oxygen content of molten steel is≤10ppm, sulfur wire and titanium wire are accurately fed;In the continuous casting process, the inclusion is controlled to gather in the stopper head and the water gap bowl by stopper shaking method, and the basicity of protective slag is controlled to be 0.85~0.95.The sulfur titanium-containing welding wire steel prepared by the above method.The present application solves the problems of small square billet sulfur titanium-containing welding wire steel surface slag inclusion, intermediate crack and water gap nodule.

The embodiment of the invention provides a system and method for online measurement of the slag state in electric arc furnace steelmaking, and relates to the field of steelmaking, the system comprises a front-end audio acquisition unit, a signal processing unit, a video splashing detection unit and a picture debugging display unit, the front-end audio acquisition unit is used for acquiring a noise signal in a furnace, and the signal processing unit is used for processing the noise signal; the signal processing unit is used for carrying out frequency division processing on the received noise signal, outputting a standard signal and obtaining a voiceprint slagging curve based on the standard signal, the video splashing detection unit comprises a video filtering camera and a video acquisition card and is used for acquiring an electric furnace mouth image picture, and the picture debugging display unit is used for displaying the electric furnace mouth image picture. The method is used for displaying the voiceprint slagging curve and the electric furnace mouth image. Intelligent measurement and control of the slag state in the steelmaking process of the electric arc furnace are achieved, manual intervention is reduced, the steelmaking efficiency and the molten steel quality are improved, the production cost is reduced, and wide application prospects are achieved.

The invention relates to a delayed fracture resistant non-quenched and tempered 14.9-grade high-strength cold heading steel wire rod and a preparation method thereof. The wire rod comprises the following chemical components: 0.33%-0.55% of C, less than or equal to 0.10% of Si, 1.5%-2.3% of Mn, 0.4%-0.6% of Cr, 0-0.04% of Nb, 0-0.1% of V, 0-0.1% of Ti, 0.004%-0.008% of B, more than or equal to 0.020% of Als, less than or equal to 0.040% of Alt, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 1ppm of H and the balance of Fe and impurity elements. Fine control is adopted in the steelmaking process, the H content is strictly controlled to be lower than 1 ppm, a hydrogen trap is manufactured by adding microalloy elements such as Nb, V and Ti, and the delayed fracture resistance is improved; the air cooling speed of the rolled hot-rolled wire rod is precisely controlled, so that the structure of the hot-rolled wire rod is lath bainite, and high strength is realized by utilizing a medium-carbon bainite structure; the finished wire rod has high strength, high plasticity, excellent low-temperature impact toughness and good delayed fracture resistance.

The invention discloses a high-strength steel continuous casting secondary cooling spraying nozzle flow intelligent adjusting structure, and belongs to the technical field of continuous casting steelmaking, the high-strength steel continuous casting secondary cooling spraying nozzle flow intelligent adjusting structure mainly comprises a first spraying box, a transmission assembly is arranged in the first spraying box, the transmission assembly comprises a rotating motor, and one set of water inlet shells is fixedly connected with the output end of the rotating motor; wherein one group of water inlet outer shells is the same as the water inlet holes of the water inlet inner shells in position, and the other group of water inlet outer shells is staggered with the water inlet holes of the water inlet inner shells in position by 180 degrees; according to the intelligent flow adjusting structure of the high-strength steel continuous casting secondary cooling spray nozzle, the rotating motor is started, water inlet holes in the water inlet outer shell and water inlet holes in the water inlet inner shell in the water inlet outer shell are staggered through rotation of the water inlet outer shell, then the flow is adjusted, and the staggered angle between the water inlet holes of the water inlet outer shell and the water inlet holes of the water inlet inner shell in the other group is 180 degrees; by means of the design, the flow rate during spraying can be conveniently and rapidly controlled, and meanwhile back flushing can be conducted in the spraying pipe.

The invention discloses a method for improving the toughness performance of low-alloy high-strength steel by adding rare earth cerium-iron alloy and application of the method, and belongs to the technical field of steel rolling and product development. According to the method, narrow window control is conducted on converter steelmaking, LF refining and RH vacuum treatment in an existing wide and thick plate low-alloy high-strength toughness steel production technological process, a cerium-iron alloy is added after alloying in the RH vacuum treatment process is finished and circulated, temperature measurement and oxygen determination are conducted before the cerium-iron alloy is added, and the active oxygen is smaller than or equal to 3 ppm. The method is applied to an RH vacuum treatment step of industrial production of wide and thick plate Q690E steel and comprises the following steps: adding a titanium-iron alloy and a ferroboron alloy in sequence for alloying, circulating after alloying is finished, and adding a cerium-iron alloy; and carrying out soft blowing after the RH vacuum treatment is finished. After the rare earth cerium-iron alloy is added, the average size of low-alloy high-strength steel inclusions is remarkably reduced, the average grain size is greatly small, the average width of a martensite lath bundle is narrowed by less than 200nm, and the toughness performance is remarkably improved.

The invention provides a low-sulfur manganese-silicon alloy and a production method thereof.The method comprises the steps that silica, coke and manganese ore are crushed and then mixed with lime, and smelting raw materials are obtained; a closed electric furnace is filled with smelting raw materials for smelting, and alloy melt is obtained; the alloy melt is transferred into a ladle, a desulfurizing agent is added for the desulfurization process, and manganese-silicon alloy molten iron is obtained; and the manganese-silicon alloy molten iron is poured into a mold for ingot casting, and a manganese-silicon alloy finished product is obtained after cooling. According to the method, the method capable of effectively reducing the sulfur content in the manganese-silicon alloy is provided through the steps of raw material crushing and mixing, in-furnace power transmission refining, out-of-furnace desulfurization, casting molding and the like, the low-sulfur manganese-silicon alloy is produced, and therefore control over the sulfur element content in a steelmaking product is facilitated.

The utility model relates to a converter gas recovery system which comprises a first cooling flue used for being connected with a converter, the first cooling flue is provided with a first gas outlet and a second gas outlet, the first gas outlet is connected with a gas processing mechanism, and the second gas outlet is connected with a gas waste heat recovery mechanism. And valve control units are respectively arranged at the first gas outlet and the second gas outlet. According to the utility model, the converter gas can enter the gas treatment mechanism to be treated and can also enter the gas waste heat recovery mechanism to be treated, so that the process flexibility is high, the treatment effect of the converter gas can be ensured, and the reliability and the safety of converter gas treatment are improved; the coal gas treatment mechanism and the coal gas waste heat recovery mechanism can be standby for each other, and when one mechanism is not used, the other mechanism can be switched for treatment, so that the coal gas treatment mechanism and the coal gas waste heat recovery mechanism are convenient to overhaul and maintain, and the stability of converter steelmaking production is ensured.

The present discloses a thermal energy recovery auxiliary system for temperature detection of molten steel in a steelmaking process, comprising an electric arc furnace, a water supply device, a power generation system, a piston type oxygen compression device, and one or more non-contact temperature measurement devices. A flue communicates with a side wall of the electric arc furnace. The water supply device includes a water supply tank, a water supply pipeline of an electrolytic cell, and a thermal energy recovery component. The power generation system includes a Seebeck-effect thermoelectric power generation component and an electrolytic cell. The piston type oxygen compression device forms a steam containment chamber and an oxygen containment chamber through a piston isolation. One end of each of the one or more non-contact temperature measurement devices communicates with the oxygen containment chamber and the other end of each of the one or more non-contact temperature measurement devices communicates with an interior of the electric arc furnace.

The invention relates to the technical field of steelmaking roller way overhaul construction in the metallurgical industry, in particular to a laser-assisted positioning method for bolt installation. Comprising the following steps that connection between a roller way and a driving motor and a dry oil pipe are removed, and the roller way is hoisted to a storage site; bolts and slurry piers on the roller bed foundation are cleaned, and all the bolts are ensured to be intervisible; and the laser locator Z prints an elevation line parallel to the plane of the roller bed foundation, the elevations of all the bolts are measured, and the unified installation elevation of the bolts is determined by taking the mode of the measured values and combining the original design drawing and the elevations of the front and rear sections of foundations and considering the foundation settlement and the running stability of the steel billets. According to the method, the longitudinal datum line, the transverse datum line and the elevation datum line are established through the laser locator X, the laser locator Y and the laser locator Z respectively, a three-dimensional space positioning network is formed, it is ensured that the bolts are accurately aligned in the horizontal position, the perpendicularity and the height direction, and personal errors and position deviation caused by a traditional lofting method are remarkably reduced.

According to the NM450 wear-resistant steel suitable for the polar working condition and the production method thereof, low-cost component design is adopted, and the process steps comprise smelting, refining, continuous casting, heating, rolling and heat treatment; the steel-making process and harmful elements are strictly controlled to improve the purity of molten steel so as to improve the internal quality of the steel plate, and a strict rolling, quenching and low-temperature tempering heat treatment process is adopted. The NM450 wear-resistant steel plate which is high in toughness adaptability, high in wear resistance and excellent in cold forming performance comprehensive performance is developed, the thickness ranges from 6 mm to 30 mm, the surface hardness ranges from 450 HBW to 480 HBW, the core hardness ranges from 440 HBW to 465 HBW, and the core hardness reaches 95% or above of the surface hardness; the yield strength is not less than 1200 MPa, the tensile strength is not less than 1400 MPa, and the elongation is not less than 13%; the impact AKV at-50 DEG C is greater than or equal to 60J, and the impact AKV at-60 DEG C is greater than or equal to 40J; the bending angle is 90 degrees, the bending diameter D is 6a, and the cold bending result is intact.

This utility model discloses a baking device for steelmaking plants, including a baking furnace body, a combustion nozzle assembly, and a slag collection trough. The baking furnace body has a feed inlet at the top and a discharge outlet at the bottom. The combustion nozzle assembly is vertically positioned above the interior of the baking furnace body. The slag collection trough is located below the baking furnace body, with an open top connecting to the discharge outlet. The bottom wall of the slag collection trough is inclined, and a spiral slag discharger rotates within it, with its axis parallel to the bottom wall. This utility model adjusts the height of the injection pipe and nozzle by extending and retracting the first cylinder of the combustion nozzle assembly, thus optimizing baking uniformity for materials of different thicknesses. After baking, the slag falls into the slag collection trough through the discharge outlet and slides along the inclined bottom wall towards the spiral slag discharger. The rotating spiral blades, with a variable pitch structure, push the slag towards the outlet, improving slag discharge efficiency.