Abstract:According to the current status of the Yinshan Steel Company's two 265 m2 sintering finished product screening and sizing systems,which are prone to leakage,poor screening and sizing effect,and difficult maintenance,the second and third screens were optimized and transformed into an efficient and environment friendly finished product screening and sizing system with a new integrated structure.This system is beneficial for improving the screening quality of sintered ore,and also has obvious effects of saving electricity and reducing spare parts costs.It achieves the goal of improving the working environment,reducing the maintenance volume of system equipment,and reducing the screening index of sintered ore below-5 mm.

Abstract:Aiming at the upgrading requirements of high strength,high wear resistance,corrosion resistance,fatigue resistance and other properties of hot-rolled steel strip for manufacturing of high-quality mechanical connection flat washers,by optimizing composition design,optimizing argon blowing system during smelting process and collaborative control of tundish superheat,selecting appropriate pouring temperature and billet pulling rate,precise control of C,S and other segregation elements is achieved.To ensure the uniform structure of the steel strip thickness direction,the high quality carbon hot rolled steel strip for flat washers has been successfully developed.The obtained steel strip thickness specification is 4.5-10 mm,uniform organization,mainly pearlite plus ferrite,product performance meets the wind power,railway,steel structure,bridge,subway,automobile and other industries for high-quality flat gasket manufacturing requirements,with strong industrial practice and promotion value.

Abstract:Based on the analysis of the coal quality stability of a certain high sulfur gas fertilizer coal A,this article applies it to the production practice of Stamp-charge battery coke,and analyzes the quality of the obtained coke.The results show that using low-rank low sulfur coal in combination with A coal can achieve the goal of reducing coal blending costs while maintaining stable coke quality.

Abstract:Based on AI vision and industrial robot technology,the unmanned operation of torpedo tank hot metal pouring workshop in steel plant is realized by replacing various processes with intelligent equipment.An auxiliary parking system is added to the train stopping process to assist the train driver to realize automatic parking;an automatic plug-in/plug-out robot is added to the torpedo tank car plug-in/plug-out process to replace manual work,and an AI vision tank number recognition system is added to automatically identify the torpedo tank number;in the process of lifting and transporting iron ladle by crane,AI camera is added to assist in judging the lifting and placing of iron ladle,and the iron weighing truck can run automatically according to working conditions.The temperature measuring and sampling robot is used to replace manual work to achieve automatic temperature measurement and sampling;through vision and comprehensive operation status of each process,the automatic pouring of hot metal is realized instead of manual work.

Abstract:The traditional hard connection method between the small sleeve and the middle sleeve of the tuyere is prone to air leakage,which affects the production efficiency and energy consumption of the blast furnace.By adding two sealing rings at the edge of the air outlet sleeve,this problem was effectively solved.The article elaborates in detail on the structure,working principle,material selection,installation method,and actual application effect of the device,including its impact on hot air utilization rate,energy consumption,equipment life,etc.,and compares and analyzes it with traditional devices.

Abstract:For complex working environments such as high temperature,strong thermal shock,and mechanical erosion in forging furnaces,refractory materials need to have good thermal stability,corrosion resistance,and mechanical strength.The article combines the working conditions of different parts of the forging furnace to explain the selection of refractory materials for the furnace lining,furnace top,and furnace door.The furnace lining uses high-strength refractory castables to improve erosion resistance,the furnace top uses low thermal conductivity prefabricated components to reduce heat conduction,and the furnace door uses composite refractory materials to enhance sealing.At the same time,provide a detailed explanation of the key points of refractory material construction technology,including the control of pouring material ratio,the accuracy requirements for prefabricated component installation,etc.,and propose maintenance strategies and solutions to common peeling and cracking problems during use,providing technical and construction references for the rational application of refractory materials in forging furnaces.

Abstract:This paper conducts sample analysis on the unqualified flaw detection of L485M pipeline steel.Through microscopic examination by electron microscope and combined with the on-site process,the types and sizes of inclusions affecting the flaw detection quality are determined.Two adjustment tests of the clean steel smelting process have been carried out,achieving good results.The flaw detection qualification rate under the tightened internal control standard has increased from 69.7％to over 99.5％,achieving stable and controlled flaw detection quality of pipeline steel.

Abstract:Against the carbide band and network structure of GCr15 round steel used for rolling elements do not meet the standard requirements,by optimizing the composition control,the continuous casting process speed is reduced to 0.85 m/min,the superheat is controlled to 30-40℃,and the light pressing is pressed forward with a large pressing amount.The diffusion time of the heating high-temperature section during the rolling process is greater than or equal to 230 minutes.After rolling,the steel is cooled through water,and the temperature of the cooling bed on the round steel returns to a uniform temperature of 650-680 ℃.The above process is adopted to roll into different specifications of round steel with a diameter of 20-60 mm.The stability control of carbide band and network structure in bearing steel is maintained at 1.0-2.0 grades which meet the steel requirements for rolling elements of bearing steel.

Abstract:High precision tape manufacturing of raw material 50 cold rolled steel strip steel purity and strip performance stability and other quality standards put forward extremely high requirements,through the"KR hot metal pretreatment combined with RH vacuum refining"technology,the carbon mass fraction of 0.52％to 0.58％,the total amount of phosphorus and sulfur impurities control within 0.023％,improve the purity of steel;Three stage temperature control is adopted in hot rolling,rough rolling increases the pass reduction,and the final rolling temperature and laminar cooling rate are precisely controlled to obtain a uniform hot rolling complex structure with grain size of 7.5-8.5.With the help of dynamic roll gap compensation technology,the total reduction rate can reach 70％-82％,and the 50 cold rolled steel strip which meets the demand of high precision tape manufacturing is developed by the cover annealing process.After the performance test,the average tensile strength of the steel strip is 518 MPa(fluctuation ≤ 20 MPa),the average yield strength is 365 MPa,the average elongation is 25.66％,the surface roughness Ra is less than 0.9 μm,and the annealing is uniform spherodized pearlite.In industrial production,the qualified rate of customers' trial batches has reached 98.9％,providing high-quality raw materials for the manufacturing of high-precision tape measures.

Abstract:40Mn2-1 hot-rolled round steel is mainly used for engineering applications.Customers using Φ100 round billets for hot upset forging experienced cracking in some parts.Through inspections and investigations of the actual production process using metallography,electron microscopy scanning,and other methods,it was ultimately determined that high hydrogen content in the steel and improper control of slow cooling of the continuous casting billet during the steelmaking process were the root causes of internal cracks in the billets,leading to cracking in the rolled products.To address this issue,measures such as adjusting the vacuum degassing process in the VD furnace and strengthening the control of slow cooling of the continuous casting billet were implemented,effectively controlling the cracking problem in the 40Mn2-1 Steel billets.

Abstract:Based on a six-strand billet continuous casting machine project exported to a country in the Middle East,this paper introduces the main process technical parameters,process flow and characteristics of the main process equipment of the continuous casting machine.During the implementation of overseas projects,the environment is more complex.The design standards,design communication and handover and confirmation of design documents are different from those in China.This paper explains the content of design management and focuses on the relevant design management experience such as design scope,design process control,design interface management and design liaison.

Abstract:Aiming at the failure problem of 90° bending cracking of 355 MPa grade low alloy hot-rolled steel strips,the cracking causes were analyzed through methods such as micro structure observation and mechanical property testing.The results show that the base material structure is mainly pearlite+ferrite and contains a small amount of bainite.The overall strength is relatively high.There are burr defects at the shear edge.Moreover,in the bending test,the bending radius is too small,resulting in stress concentration and causing the deformation of the outer metal to exceed the deformation limit,which is the main factor causing bending cracking.The micro structure abnormalities and surface quality defects formed by surface rust on the steel strip and pear lite segregation in the core further intensify the risk of cracking.The research suggests that in the smelting and rolling process,by reducing the billet drawing speed and optimizing the controlled rolling and controlled cooling process to control the uniformity of the micro structure,using indoor storage and covering with rain covers to prevent surface rust during storage,and optimizing the shearing process during bending processing to improve the edge cutting accuracy and avoid burrs,the cracking problem during the bending and pipe manufacturing of this type of steel strip can be effectively controlled.It provides a process optimization direction for improving the processing performance of low alloy steel strips.

Abstract:Since 2024,the No.4 blast furnace of Rizhao has experienced poor operation,high fuel consumption,and poor blast furnace capacity to accept air volume.The blast furnace breaks away from conventional concepts and adopts short tuyere reshaping operation to shape the furnace.At the same time,based on the mathematical model formula of the blast furnace tuyere swirling zone,high wind speed and high blast energy operation are adopted to increase the proportion of swirling zone area,improve smooth operation,and optimize the blast furnace indicators.

Abstract:The nitrogen content in steel directly affects its formability,welding performance,high-temperature toughness,and brittleness,while also exacerbating the aging and brittleness of the steel.A green and environmental protection control method for the whole process of argon blowing is proposed in this paper.Argon is blown on ladle before steel discharge to control nitrogen content in molten steel during converter discharge process,so that the molten steel flow and steel water surface in the process of steel discharge are in argon atmosphere,thus reducing nitrogen absorption in molten steel and avoiding corner cracks in continuous casting billet caused by high nitrogen content in molten steel.The quality of casting billet,metal yield and environmental protection are improved.

Abstract:This article elaborates on the importance of hydrogen energy in energy conservation and carbon reduction in the steel industry.It analyzes the production processes of hydrogen energy in the steel industry,including hydrogen extraction from coke oven gas,hydrogen production from coal gasification gas,and hydrogen production from natural gas.Combined with current development,it focuses on describing the main application pathways of hydrogen energy in the steel industry,including hydrogen rich blast furnaces,hydrogen based vertical furnaces,and hydrogen rich sintering.Finally,several suggestions are proposed to expand hydrogen sources,explore new hydrogen metallurgical technologies,and provide policy guarantees.

Abstract:Fatigue resistance is the key index for testing the steel used in the shaft of construction machinery,but the application of steel is limited by the problems of high cost and complicated process flow.The fatigue resistant 30CrMnTi steel developed by Laiwu Branch of Shangang Co.,Ltd.can replace the quenched and tempered 20CrMnTi.Its static torsional strength K=2.13,torsional fatigue B50≥30×104 times,tensile strength≥1 470 MPa,nonmetallic inclusions A and B are not more than 1.5 grades,C and D are not more than 0.5 grades,and grain size is not less than 7 grades.All indexes meet the technical requirements of users.

Abstract:To address issues such as poor wear resistance of the chain grate conveyor's chute plates,long relocation processing time,and unreasonable material distribution angles,technical measures have been adopted,including using stainless steel plates,designing automatic reset structures,and optimizing the material distribution angle.These measures have led to a"material pile material"distribution method,improving the uniformity and gas permeability of the material layer,and enhancing the heat utilization efficiency and production efficiency of the rotary kiln.

Abstract:To meet the low-silicon smelting requirements of blast furnaces at Qingdao Special Steel,measures such as optimizing raw material and fuel management(coking coal M40≥85%,CSR≥65%),operating systems(oxygen enrichment rate≥3.5%,slag basicity 1.18～1.23),thermodynamic regulation(physical heat≥1 500℃),and equipment modification were implemented.As a result,the silicon content in molten iron was reduced from 0.433%to 0.415%,achieving the goal of reducing fuel consumption and lowering the cost per ton of iron,directly creating an annual benefit of 9.96 million Yuan.

Abstract:Round bar of GCr15 bearing steel was developed and produced adopting the process route of LD(100 t)→LF(100 t)→RH(100 t)→CC(240 mm×300 mm)→rolling.In order to verify product quality,fatigue test was done for GCr15 which of fatigue life L10 reached 2.107 6×107.However,the fatigue failure occurred in some samples,in order to find out the cause of fatigue,examination and analysis of SEM,inclusions and carbides was done for the samples which showed the fatigue failure was caused by class B or D/DS inclusions contained Al2O3 that are not easily deformed,even though the size of this kind inclusions was not big and this kind inclusions may be Al2O3,MgO·Al2O3 of class B or CaO·6Al2O3,CaO·2Al2O3 of class D/DS.

Abstract:This article studies the influence of chemical components such as CaO,MgO,Al2O3,SiO2 on the metallurgical properties of high alumina blast furnace slag through viscosity tests.The focus is on analyzing the effects of factors such as binary alkalinity(R2),MgO,Al2O3,and magnesium aluminum ratio on slag viscosity and melting temperature.The aim is to provide theoretical basis and practical guidance for the smooth and efficient smelting of Tiangang combined blast furnace.