Abstract:In view of the quality problems in the development process of 50Cr15MoV stainless steel for high-end cutting tools,the difficulties and cruxes of process control are found out,and improvement measures are made to optimize the process scheme,the problems of 50Cr15MoV rolling,such as delamination and carbide segregation,are solved by improving the composition of molten steel and temperature hit ratio of GOR furnace,optimizing the slab thickness,adopting dynamic soft reduction and improving rolling process The process of annealing and pickling was optimized to improve the properties and microstructure of steel strip and meet the requirements of customers.

Abstract:This article introduces the control methods for terminal sulfur in the smelting of non-oriented silicon steel in a 100 t converter,through the following measures:Before the converter starts to smelt silicon steel,the furnace is washed with low-sulfur molten iron and scrap steel for 3 to 5 furnaces until the terminal sulfur content is below 0.006%.The sulfur content of the low-sulfur scrap steel used is less than 0.010%,and the sulfur content of the lime is below 0.02%.The flow rate of a single bottom-blowing gun in the converter is not less than 600 L/min.Before the steel is discharged,a slag stopper is used for front slag blocking.The steel tapping time is more than 3.5 minutes within 100 batches.The above measures are systematically controlled to achieve the goal of sulfur control.

Abstract:This paper uses the finite element software and based on the general fatigue S-N curve of structural steel,simulates and studies the influence of various factors such as the length,width,and the presence or absence of internal inclusions of cracks on the fatigue of 45B pin shaft steel on different crack detection steps.The following conclusions are ultimately drawn:The detection standard of pin shaft billets using the acid immersion crack inspection result as the judgment basis is not scientific.The crack inspection should take the magnetic particle inspection result as the judgment basis;it is reasonable to use 1 mm as the starting length for crack length;when the crack width is less than 0.4 mm,its fatigue life remains basically unchanged;when the crack width is greater than 0.4 mm,the fatigue life of the crack gradually increases;for internal inclusion-type cracks,it can be considered that they have no effect on the fatigue life of the pin shaft;when the crack is greater than 4 mm,the fatigue life of the pin shaft basically approaches 0.The original standard using 5 mm length as the judgment basis is not appropriate.A unified judgment standard can set the crack limit length to 4 mm.

Abstract:This paper introduces the common technologies for wastewater treatment in the steel industry.In view of the characteristics of steel enterprises that consume a large amount of fresh water and generate a large amount of wastewater,it briefly analyzes the current situation and problems of wastewater treatment in steel enterprises.From the perspectives of water conservation ideas,wastewater treatment,water quality improvement,and technological innovation,it proposes suggestions for zero wastewater discharge improvement,thereby achieving energy conservation,environmental protection,cost reduction,and efficiency improvement.

Abstract:This article introduces the transformation of blast furnace material chute and the application of material matrix control technology in blast furnace production.By renovating the fabric chute with new wear-resistant materials and optimized structure,its service life and fabric accuracy have been significantly improved.Meanwhile,with the help of fabric matrix control technology,precise distribution of furnace materials has been achieved,improving gas utilization efficiency and reducing fuel consumption.By combining measures such as adjusting the air supply device and selecting the platform with funnel material matrix,the smelting situation of the blast furnace has been effectively improved,providing strong support for the efficient and stable operation of the blast furnace.

Abstract:Based on the production conditions of Shiheng Special Steel,and addressing the challenge of low cost control in double-chamber kilns,we analyzed the production characteristics and cost composition of double-chamber kilns.By deeply integrating digital intelligence technology with lean management concepts,we proposed corresponding cost control strategies,achieving a cost reduction of 12.65 Yuan/ton.

Abstract:Provide a detailed introduction to a method developed independently by Laigang for formulating burdening plan of equal SiO2 equal TFe.After writing this method into an automated program,it can quickly complete calculations and output results.The deviation of SiO2 and TFe values in each stage of the burdening plan can be controlled within 0.01%.

Abstract:Analyze the fracture delamination problem in the room-temperature transverse tensile test of 420 MPa grade low-alloy steel plates,paper adopts multi-dimensional technologies such as fracture morphology observation,non-metallic inclusion detection,metallographic structure analysis,scanning electron microscope(SEM)inspection,and energy dispersive spectroscopy(EDS)inspection to systematically explore the macro-morphology and microstructural characteristics of the samples,and clarify the causes of delamination and key influencing factors.The results show that the pearlite composition segregation and type A MnS strip inclusions in the core of the steel plate are the core causes of delamination.The composition segregation forms a mechanical weak zone in the core,and the MnS inclusions split the matrix and cause local stress concentration.Under the tensile load,cracks initiate and propagate in the stress concentration area,leading to delamination.The chemical composition and overall mechanical properties of all samples meet the GB/T 1591-2018 standard,and delamination is caused by local defects.In view of causes,measures such as improving purity of molten steel,optimizing continuous casting process with low superheat pouring,and adjusting controlled rolling and controlled cooling parameters are proposed,which can effectively reduce the occurrence rate of delamination defects.

Abstract:This article explores the significant impact of steel throwing speed on throwing distance and its application significance in hot rolling projects.Based on the process layout of APM company,it has been determined that under the condition of a friction coefficient of 0.25,a reasonable steel throwing speed of 4 m/s should be selected to achieve a balance between production efficiency and product quality,and effectively control costs.Research has found that a reasonable throwing distance is crucial for the stability and efficient operation of the rolling process,while also helping to shorten the length of the rolling line and control investment within a reasonable range.This study provides empirical evidence for optimizing the steel throwing process,and looking forward to the future,more factors need to be comprehensively considered to further explore the potential of the steel throwing process.

Abstract:Experiments on abrasion resistance,thermal explosion,and calcination at different temperatures were conducted on limestone with similar chemical compositions but different grain sizes.The results showed that the larger the grain size of the limestone,the worse its abrasion resistance,the more severe the explosion at high temperatures,and the slower the calcination decomposition rate.At higher temperatures,the decomposition rate of limestone with different grain sizes was faster,and the larger the grain size,the narrower the temperature range for producing higher-quality lime.This experiment provides guidance and recommendations for selecting limestone in the lime calcination process.

Abstract:This article deeply explores the hazards of zinc in blast furnaces and various measures to improve the zinc removal rate of blast furnaces.The circulation and accumulation of zinc in blast furnaces can have many adverse effects on gas utilization,coke quality,lining structure,and charge performance.Through the analysis of zinc discharge pathways,a series of comprehensive measures have been proposed,including raw material control,improvement of blast furnace operation system,slag management,adjustment of iron tapping frequency,gas ash treatment,and monitoring and analysis.The aim is to reduce the enrichment of zinc in the blast furnace,improve its production efficiency and lifespan,and provide useful reference and guidance for steel enterprises'blast furnace iron-making production.

Abstract:This study focuses on the profound impact of increasing the ratio of sintered ore on the smooth operation,trend,and process operation of blast furnaces.Through in-depth analysis of permeability,characteristics of soft melt zone,thermal regime,reduction process,and various process operation links,combined with a large amount of actual production data and case analysis,the aim is to provide comprehensive and in-depth theoretical basis and practical guidance for steel enterprises to optimize furnace burden structure,improve blast furnace production efficiency and economic benefits.

Abstract:According to the requirements of lightweight,high bearing capacity and long service life proposed by the quality upgrade of steel formwork for building concrete construction,the composition system design of medium carbon,low silicon and medium manganese,plus niobium and titanium micro-alloy is adopted,and the solid solution strengthening of carbon and manganese elements and the precipitation and precipitation strengthening of niobium and titanium elements are fully utilized.The cold-rolled steel strip for the manufacture of building support formwork has been successfully developed by combining the whole process of protective pouring technology,controlled rolling and cooling and cover annealing technology.The obtained annealed steel strip structure is ferritic+point spherical free cementite,yield strength is more than 345 MPa,tensile strength is more than 470 MPa,elongation after breaking is more than 16%,the product on the basis of ensuring strength and toughness,has a good elongation,fully meet the bending and strength requirements of steel formwork manufacturing.The mass preparation of cold-rolled steel strips for high-performance building support structures is realized,which meets the needs of customized services of users,and has strong industrial practice and promotion value.

Abstract:There are many ladle baking positions in a steel enterprise,and at the same time,it is basically a single point control,without accurate measurement and accurate control system.In view of this situation,this project can realize the ladle baking process in different states automatically according to the baking process curve,and the accurate control and measurement of ladle baking gas in a certain enterprise by upgrading and reforming the ladle baking PLC automatic control system.The gas consumption is effectively reduced by nearly 30%,and the ladle baking control and data in the steelmaking workshop are connected through Ethernet after the transformation and upgrading,and the remote control and energy consumption data detection of ladle baking are realized.This paper has certain reference significance for the development of ladle baking technology in the steel industry.

Abstract:The high scrap ratio in the long process of iron and steel enterprises to reduce carbon emissions and improve economic benefits has a certain significance,scrap preheating as an important method to improve the scrap ratio,scrap high efficiency,low carbon baking technology has become more and more the focus of the industry.In this paper,the influence of different scrap preheating temperatures on the improvement of scrap ratio is calculated.Meanwhile,the scrap preheating test based on the efficient utilization of scrap preheating exhaust gas proves that the preheating efficiency of scrap can be effectively improved by recycling exhaust heat from regenerative bricks,which provides a certain reference value for the subsequent development of efficient and low-carbon scrap preheating devices in iron and steel enterprises.

Abstract:The black line defect at the edge of wide and thick plates,also known as"edge straight cracking",is closely related to factors such as the state of the casting slab corner and rolling process.It usually appears in different forms such as wider single strips or thinner multiple"wire drawing"strips.It is a common problem faced by medium and thick plate production enterprises in the industry.Constructing a finite element calculation model for thermal/mechanical coupling in the rolling process,studying the temperature field and metal flow deformation law of casting slabs with different narrow surface slab structures during the rolling process.By reserving a widening amount on the narrow surface of the casting billet,the widening amount in the middle of the narrow surface during the rolling process is equivalent to the widening amount on the upper and lower surfaces in the last pass,in order to achieve the goal of controlling the distribution range of black lines.After on-site implementation verification,the new mould has achieved significant results in improving the black line defects of wide and thick plates,and the distance between the black line and the side edge of the steel plate can be reduced by 10 mm.

Abstract:Metallurgicalferricdust was fused by NaOH and dissolved in water.Fluorine in the sample was effectively melted out.The pH of the solution was adjusted by hydrochloric acid(1+1)and NaOH solution with alizarin red S solution as the indicator.Then the pH of the solution was adjusted between 5 and 6 by adding sodium citrate buffer solution.The potential value was measured with the fluoride ion selective electrode to calculate the content of fluorine in the sample.The results indicate that the relative standard deviations(RSD,n=8)of measured results were less than 3.00%and the recoveries were between 95%-110%.

Abstract:In order to improve the accuracy of predicting the inlet pressure of the sintering plant,the least squares support vector machine is applied for prediction.The prediction model is improved by adding complementary set empirical mode decomposition and Markov chain method.The main inlet pressure time series is decomposed into different components through complementary set empirical mode decomposition.These components are used as model inputs and trained using LSSVM models to obtain initial predicted values.Then,based on Markov chain theory,an error state transition matrix is established to obtain the corrected error,which is combined with the initial predicted values to obtain the final predicted value.The improved algorithm model has higher prediction accuracy than the LSSVM algorithm,which verifies the effectiveness of the model.

Abstract:As an important basic processing raw material,the current information identification and recognition of special-shaped continuous casting billets are relatively backward due to their own morphology,structure,and stacking method.With the development of equipment technology and the organic integration with process requirements,the development and application of equipment systems for identifying and recognizing special-shaped continuous casting steel billets are carried out through mature industrial robot technology and machine image recognition algorithm models.This solves the problem of inaccurate manual identification and information tracking,and is an important technical means to achieve quality traceability of special-shaped continuous casting steel billets.This article introduces the development and application of an equipment system for identifying and identifying special-shaped continuous casting steel billets in a domestic steelmaking plant.After the system was put into use,its application met on-site requirements and improved the quality traceability and control level of special-shaped billets.

Abstract:Aiming at the high incidence of fire cutting crack in die steel,the characteristics and mechanism of fire cutting crack were analyzed according to the actual process parameters.It is determined that hydrogen stress,thermal stress and structure stress are the causes of fire crack.The stress of steel plate was alleviated by four controls:stacking and cooling to 150℃before the slab was put into the furnace,the heating time of slab was extended to 400 min,stacking and cooling to 250℃after the steel plate was rolled off the line,and stacking and cooling to 100℃after the steel plate was cut.The crack rate of steel plate was reduced from 80%to 10.4%.