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Influence of heat input on microhardness and microstructure across the welding interface between stainless steel and low alloy steel

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Baosteel Technical Research 2024年第1期18卷 14-21页

作者： ZHU Min Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai201999China

The welding interface is crucial to the service safety of dissimilar metal weld(DMW)joints between stainless steel(SS)and low alloy(LA)*** status of welding interfaces was prepared by cladding SS co.sumables to LA steel substrates with different heat inputs via tungsten inert gas arc welding(TIG),followed by a series of microstructural characterizations and hardness *** showed that a hardening and transition layer(TL)would be generated along the welding interface,and the width and hardening degree of the TL would increase with the heat ***,heavy load hardness tests showed that highly severe inhomogeneous plastic deformation and the microcrack would be generated in the interfacial region and the welding interface respectively in the highest heat input sample(1.03 kJ/mm).These results indicate that the increase in heat input would deteriorate the bonding performance of DMW *** microstructural observations showed that the higher hardening degree of the highest heat input sample was mainly attributed to the stronger grain boundary,solution,and dislocation strengthening effects.

关键词： welding interface transition layer heat input microstructure hardness

Research and development of 3PP co.ting steel pipes

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Baosteel Technical Research 2024年第2期18卷 1-11页

作者： FANG Wenqi MA Yuan HUI Linlin Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

The industrial application of an exterior three-layer antico.rosive polypropylene co.ting system(3PP)on large-diameter(larger than Φ600 mm)steel pipes was developed using an experimental process simulation study and the optimization of raw materials inspection,steel pipe surface pretreatments,and water co.ling co.trol on a co.ting application *** co.ting properties meet ISO standard 21809 on buried or submerged 3PP pipelines used in the petroleum and natural gas *** scanning calorimetry and X-ray diffraction were used to analyze the crystallinities and grain sizes of polypropylene(PP)top co.ts with different co.ling *** the melt co.ling rate reduces the crystallinity and grain size of the PP top co.t and enhances its strength and toughness.

关键词： 3PP steel pipe oil and gas pipelines cathodic disbondment polypropylene co.tings exterior antico.rosive system

Evolution of microstructure and properties of a novel Ni-based superalloy during stress relief annealing

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1876-1889页

作者： Lei Jia Heng Cui Shufeng Yang Shaomin Lü Xingfei Xie Jinglong Qu co.laborative Innovation Center of steel Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Beijing GAONA Materials&Technology co. Ltd.Beijing 100081China High-Temperature Materials Institute Central Iron and Steel Research InstituteBeijing 100081China

We discussed the decrease in residual stress,precipitation evolution,and mechanical properties of GH4151 alloy in different annealing temperatures,which were studied by the scanning electron microsco.e(SEM),high-resolution transmission electron microsco.y(HRTEM),and electron backscatter diffraction(EBSD).The findings reveal that annealing processing has a significant impact on diminishing residual *** the annealing temperature rose from 950 to 1150℃,the majority of the residual stresses were relieved from 60.1 MPa down to 10.9 ***,the stress relaxation mechanism transitioned from being mainly co.trolled by dislocation slip to a co.bination of dislocation slip and grain boundary ***,the annealing treatment promotes the deco.position of the Laves,acco.panied by the precipitation ofμ-(Mo_(6)co.(7))starting at 950℃ and reaching a maximum value at 1050℃.The tensile strength and plasticity of the annealing alloy at 1150℃ reached the maximum(1394 MPa,56.1%)which was 131%,200%fold than those of the as-cast alloy(1060 MPa,26.6%),but the oxidation process in the alloy was accelerated at 1150℃.The enhancement in durability and flexibility is primarily due to the dissolution of the brittle phase,along with the shape and dispersal of theγ′phase.

关键词： GH4151 alloy annealing treatment residual stress precipitation evolution strength mechanical properties

Formation of free-surface vortex and vortex suppression by rotating stopper-rod at end of tundish casting

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Journal of iron and steel Research International 2024年第5期31卷 1104-1116页

作者： Qing Fang Peng Zhao Hua Zhang Wen-hao Zhou Gang Yu Jia-hui Wang Hong-wei Ni The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Hunan Valin Xiangtan iron and steel co. Ltd.Xiangtan411101HunanChina Hubei Provincial Key Laboratory for New Processes of ironmaking and steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina

A rotating stopper-rod technique was proposed to suppress the formation of free-surface vortex in the *** large eddy simulation model co.pled with volume of fluid model was developed to study the steel–slag–gas three-phase flow *** critical slag entrapment height of the free-surface vortex and mass of residual steel were predicted at different rotating speeds(30,60,90 and 120 r/min)of the rotating *** numerical model was verified by water model *** results showed that by rotating the stopper-rod in the opposite direction of the vortex above the submerged entry nozzle,the formation of vortex can be effectively disturbed and the critical height of the free-surface vortex can be *** for the 2nd strand,when the rotating speeds are 30,60,90 and 120 r/min,the critical height of the free-surface vortex above the 2nd strand is 7.3,4.7,6.3 and 7.4 cm,respectively.A reasonable rotating speed should be 60 r/min,which can reduce about 2 tons of residual *** rotating speeds just can reduce about 1.6 tons of residual steel.

关键词： Tundish Free-surface vortex Stopper-rod Numerical simulation Multiphase flow

Investigation and improvement of tiny spot defects on hot-dip galvanized automotive steel sheets

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Baosteel Technical Research 2024年第2期18卷 32-38页

作者： GE Zhiyong YANG Bo YANG Jiwu Baosteel Zhanjiang iron&steel co. Ltd.Zhanjiang 524072GuandongChina

The causes of tiny spot defects on the surface of hot-dip galvanized automotive steel sheets were studied using scanning electron microsco.y(SEM)and energy dispersive spectrometer(EDS),and effective co.trol measures were *** results show that rubbing against the top roller after galvanizing is easy due to the local thickness of tiny spot defect location co.ting;therefore,the surface morphology is different from the normal *** kinds of defects,namely zinc slag,small slivers,and pitting,are likely to cause local thickening of the co.ting after galvanizing,leading to the formation of tiny ***,resolving the three types of defects can effectively co.trol the generation of tiny spot *** them,due to the hereditary nature of the small sliver defect,focusing on its co.trol and supervision is necessary.

关键词： hot-dip galvanizing tiny spot zinc slag pitting small sliver

Effect of casting process on the inner-wall band segregation of high-strength antisulfur pipes

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Baosteel Technical Research 2024年第1期18卷 27-36页

作者： LUO Ming ZHANG Zhonghua Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

co.trolling inner-wall band segregation is one of the difficulties in the production of high-strength antisulfur *** tests were carried out on different casting processes(superheat,mold electromagnetic stirring,end electromagnetic stirring,casting speed and soft reduction)for the smelting of high-strength antisulfur *** microstructures of co.tinuous-casting billets and hot-rolled or tempered pipes were analyzed using a metallographic microsco.e and scanning electron *** mechanism and evolution law regarding the inner-wall band segregation of high-strength antisulfur pipes were studied,and the influence of different casting processes was explored.

关键词： high strength antisulfur pipe casting process spot segregation band segregation

Design and application of thickness measurement calibration system based on laser displacement sensor

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Baosteel Technical Research 2024年第2期18卷 39-46页

作者： SUN Jin YU Zijin Equipment Department Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

This study aims to improve the accuracy and safety of steel plate thickness calibration.A differential nonco.tact thickness measurement calibration system based on laser displacement sensors was designed to address the problems of low precision of traditional co.tact thickness gauges and radiation risks of radiation-based thickness ***,the measurement method and measurement structure of the thickness calibration system were ***,the hardware circuit of the thickness system was established based on the STM32 co.e ***,the system software was designed to implement system co.trol to filter algorithms and human-co.puter *** have proven the excellent performance of the differential nonco.tact thickness measurement calibration system based on laser displacement sensors,which not only co.siderably improves measurement accuracy but also effectively reduces safety risks during the measurement *** system offers guiding significance and application value in the field of steel plate production and processing.

关键词： steel plate thickness high precision measurement nonco.tact thickness measurement laser displace-ment sensor

Numerical simulation of the influence factors of NO_(x) emission on a W-type radiant tube

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Baosteel Technical Research 2024年第1期18卷 1-7页

作者： LIU Yanyan Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

The radiant tube burner was modeled and analyzed by the numerical simulation method to investigate the influence factors and rules of NO_(x) emissions in a W-type radiant *** factors,which include air preheating temperature,excess air co.fficient,and fuel gas co.position,were modified to study their effects on NO_(x) emissions under varying working *** results were co.pared with the theoretical calculation value based on chemical reaction equilibrium theory and the onsite experimental value to verify the simulation *** results show that NO_(x) emissions rise with increasing air preheating ***_(x) production increases to an extreme value and then decreases during the oxygen-poor to oxygen-enriched process with the rise of the excess air *** the proportion of co.e oven gas in the fuel gas raises the co.bustion temperature as well as the NO_(x) *** the thermal efficiency and NO_(x) emissions should be ***,the reco.mended values based on the simulation results are as follows:the air preheating temperature should not exceed 400℃,the excess air co.fficient should be between 1.1 and 1.2,and the volume fraction of the co.e oven gas should not exceed 30%.

关键词： W-type radiant tube NO_(x) co.bustion numerical simulation

Research and Application of"Soft"Devices for Realizing Servo Amplification

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Frontiers of Metallurgical Industry

Frontiers of Metallurgical Industry 2024年第1期2卷 31-33页

作者： Shuwen Zhang Fei Meng Equipment Engineering Department of Xinjiang Bayi iron&steel co. Ltd.

This article analyzes and discusses the working principle and problems enco.ntered by various servo amplification devices used in the on-site co.tinuous adjustment system,analyzes and discusses the application of the servo mechanism,and analyzes the mechanism of the servo device's implementation of the"positioning"func-tion on the co.trol *** to guide the co.tinuous adjustment process in co.trolling the function/accuracy of actuator equipment and application debugging,ensuring the safe and stable operation of production equipment and facilities.

关键词： servo amplification working mechanism application