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Development of JG785E High Strength High Toughness steel Plates

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Journal of iron and steel research International 2011年第S1期18卷 817-821页

作者： FENG Yong (Structure steel Dept of Technology Center of Jigang, Shandong steel Group, china) Shandong steel grp Struct Steel Dept Technol Ctr Jigang Jinan Peoples R China

A high strength structure steel plate --brand JG785E, which with more than 690MPa yield strength ,more than 47 joules toughness at minus 40℃ has been developed by Jigang of Shandong steel Group P. R. china. The steel plates can be easily welded in engineering structure due to its lower carbon equivalent value. The maximum thickness of heavy plate is 50.88mm (2 inch), the yield strength is 710-860MPa, the toughness of steel plate is 139~336J at the temperature of - 40℃ . The microstructure of steel plate is lower carbon Bainite. The main solid dissolve elements are silicon and manganese. All parameters of reheating, rolling and accelerating cooling are controlled strictly. This TMCP procedure can ensure to get better mechanical properties of steel plates, and to keep the market competitive power and lower cost of manufacture. The cleanness of steel is high by refined in ladle furnace (LF), the contents of P and S is lower. It is the low carbon Bainite microstructure that possesses the high strength, excellent lower temperature toughness and better weld-ability without preheat process. The JG785E is typical brand of the Jigang’s high strength steel brands as the S690QL conforms to EN10025-6 and as the ASTM A514M conforms to USA quenching and tempering steel specification.

关键词： JG785E high strength steel Bainite high toughness weld-ability

Characteristics of Hot Ductility in steels Containing Nb,Ti

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Journal of iron and steel research International 2011年第S1期18卷 372-376页

作者： SONG Hai-wu 1,QI Chang-fa 1,AI Xing-hui 2 (1.Technology Center of Tangshan iron and steel Group Company Ltd,Tangshan 063016,Hebei,china 2.Department of Metallurgy,Tangshan Vocational College of Science and Technology,Tangshan 063001,Hebei,china) Tangshan iron & steel grp Co Ltd Ctr Technol Tangshan 063016 Hebei Peoples R China Tangshan Vocat Coll Sci & Technol Dept Met Tangshan 063001 Hebei Peoples R China

The hot ductility was measured for a series of steels containing Nb and/or Ti with Gleeble-3500 thermo-mechanical *** is found that the effect of austenitizing temperature on hot ductility of Nb-containing steel is *** the austenitizing temperature rises up,the shape of embrittling curve (SEC) from V-shape gradually changes to U-shape,and the range of embrittling temperature widens out and the embrittling degree *** SEC of Nb-containing steel is U-shaped and the embrittling temperature range is about 600-1050℃.The initial temperature of embrittlement on the right is nearly independent of carbon *** SEC of Ti-containing steel is N-shaped and two lowest points are at about 600℃ and the A-F transformation *** SEC of Nb-Ti-containing steel is basically the superposition of two shapes mentioned *** crack on straightening in continuous casting belongs to intergranular fracture,and the crack on rolling (crack expansion) belongs to transgranular fracture.

关键词： hot ductility crack Nb-containing steel Ti-containing steel

Optimization of Oscillation Model for Slab Continuous Casting Mould Based on Mould Friction Measurements in Plant Trial

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Journal of iron and steel research International 2013年第1期20卷 13-20页

作者： WANG Xu-dong YAO Man ZHANG Li ZHANG Xiao-bing CHEN Shao-hui School of Material Science and Engineering Dalian University of Technology research institute Baoshan Iron and Steel Co Ltd Jiangsu Sha-steel Group

Lubrication and friction between the mould and strand are strongly influenced by mould oscillation, and play an important role in slab quality and operating safety during continuous casting processes. Investigation of mould oscillation is therefore essential for getting a better online control of the mould processes. A feasible approach for the development and optimization of mould oscillation was put forward, which combined online measurement of mould friction, design of negative oscillating parameters and evaluation for powder consumption. Three different control models including sinusoidal and non-sinusoidal oscillation for mould oscillations were developed to investigate and evaluate the effects of oscillation on mould friction and powder lubrication. For the purpose of investigating mould friction between mould and strand, online measurement was carried out on a slab continuous caster equipped with a hydraulic oscillator. Also the comparison of the mould friction in sinusoidal and non-sinusoidal mould oscillation was made for subsequent analysis. The industrial experiment result shows that the combination of inverse control model and non-sinusoidal oscillation mode will contribute to the proper powder consumption, leading to a suitable effect of friction force on strand surface, especially for high speed continuous casting. The proposed method provides reliable basis for guiding and optimizing mould oscillation among control models, sinusoidal oscillation and non-sinusoidal oscillation.

关键词： continuous casting mould friction oscillation mode non-sinusoidal powder consumption

Optimization and Application of Oxygen Lance Nozzle for 120 t Converter of Pangang

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Journal of iron and steel research International 2011年第S2期18卷 190-194页

作者： CHEN Jun1, LIANG Xin-teng1, LIU Rong-di2, ZENG Jian-hua1 (1. Pangang Group research institute Co., L td. Chengdu 611731, Sichuan, china 2. Vnadium-recoverying and steel-making plant of Pangang, Panzhihua 617062, Sichuan, china) Pangang grp res inst Co L Td Chengdu 611731 Sichuan Peoples R China Vnadium Recoverying & steel Making Plant Pangang Panzhihua 617062 Sichuan Peoples R China

In order to meet the requirement of semi-steel making, the original nozzle was optimized by Vanadium-recoverying and Stee1-making Works of Pangang. And then every parameters of the oxygen lance were assessed according to industrial tests. results show that, comparing with the original oxygen lance nozzle the new designed one has a better metallurgical effect, the average volume of oxygen and oxygen supply intensity were increased by 774m3/h and 0.19 m3/(t·min) respectively, oxygen consumption was reduced by 1.87m3/t, the blowing time was lowered by 56 seconds, a better dephosphorization effect was obtained by the new one.

关键词： steel-making oxygen-supply strength nozzle design dephosphorization

Formation of Intragranular Ferrite During Isothermal/Thermomechanical Processes in a Medium Carbon V-Ti-N Microalloyed steel

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Journal of iron and steel research International 2011年第S1期18卷 350-354页

作者： XU Lei 1,LIU Guo-quan 2,NIE Yu-zhu 1,WANG Xue-hui 1,MA E 1 (1.Hebei iron and steel Technology research institute,Shi Jiazhuang 050021,Hebei,china 2.School of Materials Science and Engineering /State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,china) Hebei iron & steel Technol res inst Shijiazhuang 050021 Hebei Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn State Key Lab Adv Met & Mat Beijing 100083 Peoples R China

For a V-Ti-N microalloyed steel with 0.34%C-1.54%Mn,intragranular ferrite (IGF) was obtained in both isothermal austenite decomposition processes and thermomechanical processes simulating the industrial seamless tubing manufacture *** show that with decrease of the isothermal temperature in range of 600℃ down to 450℃,not only the morphology of IGF changed from equiaxed to acicular,but also the equiaxed IGF and the acicular IGF were *** importantly,it is found that the amount of equiaxed ferrite increased significantly in the thermomechanical process sample water quenched from 550℃ after 800℃ deformation than that in the isothermally treated sample at 550℃ sample without hot *** implies that appropriate controlled deformation with controlled cooling can significantly promote equiaxed IGF formation,and not solely rely on nucleation mechanisms related with *** deformation of austenite without dynamic and complete static recrystallization causes high energy regions,therefore further promotes the nucleation potency of IGF.

关键词： V-Ti-N microalloyed steel intragranular ferrite (IGF) isothermal treatment thermomechanical processes controlled cooling

Magnetic Properties and Oxygen Content of Nanocrystaline FeCuNbSiB Alloy Annealed in Hydrogen and Air

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Journal of iron and steel research International 1997年第1期4卷 33-36页

作者： Chen WenzhiCentral iron and steel research institute, MMI, Beijing (100081), china Ctrl. iron and Stl. res. institute MMI lieijing 100081 China

Soft magnetic properties and distribution of oxygen are investigated for the nanocrystalline Fe 73.5 Cu 1Nb 3Si 13.5 B 9 alloy annealed in hydrogen and air respectively by means of magnetic measurements, X ray diffraction, Auger energy spectra and X ray photoelectron analysis. The oxygen content at the surface of the strips can be as high as 39 at.% after air annealing. The oxygen is concentrated mainly in the surface layer up to 30 nm in form of Fe 2O 3 and SiO 2. Excellent magnetic properties can still be reached (except for initial permeability μ o) by air annealing. The optimum temperature for the air annealing decreases by 40 ℃ than that of hydrogen annealing.

关键词： nanocrystalline alloy annealing magnetic property oxygen

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nfluences of superheat and cooling intensity on macrostructure and macrosegregation of duplex stainless steel studied by thermal simulation

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Journal of iron and steel research International 2021年第9期28卷 1125-1132页

作者： Hong-gang Zhong Xiang-ru Chen Yan-jie Liu Zhi-qiang Wei Hai-feng Yu Qi-jie Zhai Center for Advanced Solidification Technology Shanghai UniversityShanghai200444China Shanghai institute of Materials Genome Shanghai200444China research institute Baoshan Iron&Steel Co.Ltd.Shanghai200431China

The influences of superheat and cooling intensity on macrostructure and macrosegregation of one new kind duplex stainless steel(DSS)were *** simulation equipment was applied to prepare samples,which could reproduce the industrial processes of DSS manufactured by a vertical continuous slab *** and macrosegregation were analyzed using the digital single lens reflex and laser-induced breakdown spectroscope(LIBSOPA-200),*** percentage of both chill zone and center equiaxed zone increases with the superheat decreasing,while that of the columnar zone *** is only equiaxed grain existing as the superheat is 10 and 20℃.The lower the superheat is,the coarser the gain size *** cooling intensity in mold could remarkably decrease the chill zone length and refine the grains in chill zone and center equiaxed *** influences of cooling intensity on macrosegregation are greater than those of *** macrosegregation of Si,Mn and Cr is slightly dependent on superheat,while that of Cu,Mo and Ni changes greatly with superheat increasing.

关键词： Continuous casting Solidification Thermal simulation Duplex stainless steel Macrosegregation

Microstructure and Mechanical Properties of Gear steels After High Temperature Carburization

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Journal of iron and steel research International 2013年第12期20卷 140-145页

作者： YANG Yan-hui WANG Mao-qiu CHEN Jing-chao DONG Han Faculty of Materials Engineering Kunming University of Science and Technology National Engineering research Center of Advanced steel Technology Central Iron and Steel Research Institute

High temperature carburization is becoming more and more attractive because it can remarkably reduce processing time and increase productivity. However, the commonly used gear steels which are microalloyed by Al are not suitable for high temperature carburization due to abnormal grain coarsening. The gear steel 20CrMnTiNb, which is microalloyed with 0. 048% Nb and 0. 038% Ti, has been compared with the gear steel 20CrMn in terms of microstructure in the case of hardened layer and in the core after carburizing at 1000 ℃ for 4 h and mechanical prop- erties after carburizing and pseudo-carburizing. The results indicate that the fine austenite grains exist in the carbu- rized case of 20CrMnTiNb steel, while there is abnormal coarsening and duplex grain structure in the case and core of steel 20CrMn. The average prior austenite grain sizes are 19.5 and 34.2 μm for the steels 20CrMnTiNb and 20CrMn, respectively. In addition, the mechanical properties of 20CrMnTiNb steel are superior to those of 20CrMn steel. In particular, the HV hardness of the former is higher than that of the latter by about 40--70 in the range of less than 0. 7 mm in depth. Therefore, the steel 20CrMnTiNb is suitable for high temperature carburization.

关键词： gear steel high temperature carburization austenite grain size effective case depth

Elemental Partitioning Characteristics of Equilibrium Phases in Inconel 718 Alloy at 600-1100℃

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Journal of iron and steel research International 2013年第6期20卷 88-94页

作者： WEI Xian-ping ZHENG Wen-jie SONG Zhi-gang LEI Ting YONG Qi-long XIE Qing-cheng Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Central iron and steel research institute No.704 institute of china Shipbuilding Industry Corporation

The optimization of heat treatment and chemical composition for Inconel 718 alloy has been investigated uninterruptedly because of its excellent mechanical properties and metallurgical *** species , chemical compositions and content of equilibrium phases of Inconel 718alloy in the temperature range of 600-1 100℃ were calculated by using thermodynamic software ＂ Thermo-Calc ＂ and the latest relevant datebase of Ni-base superalloys.A concept of elemental partitioning fraction was used to study the partitioning characteristics of alloying elements in each equilibrium phase at different temperatures , such as Ni , Cr , Fe , Nb , Mo , Al , Ti and C , and some calculation results were confirmed under a scanning transmission electron microscope （ STEM ） .The results showed that the elemental partitioning characteristics with the change of temperature revealed the selective partitioning characteristic of alloying elements in equilibrium phases at different temperatures , such as Nb was mainly distributed in δ and γ′phase , C in carbides , Al and Ti in γ′phase and Cr , Mo in Laves *** the same time , the effect of the change of component and quantity for each precipitated phase on matrix phase can be helpfully understood , which provided a theoretic foundation to optimize the chemical composition and heat treatment in different environments for Inconel 718alloy.

关键词： Inconel 718alloy Thermo-Calc thermodynamic calculation elemental partitioning fraction