材料期刊网

HOT DEFORMATION BEHAVIOUR OF Nb-BEARING LOW CARBON STEEL AND PREDICTION OF FLOW STRESS FOR METALS DURING PLASTIC DEFORMATION

GAO Weilin.BAI Guangrun , ZHOU Zhimin , LUAN Guifu Northeast University of Technology.Shenyang , ChinaLONG Chunman Anshan Iron and Steel Company , China Lecturer , Post Box No.92.Northeast University of Technology.Shenyang 110006 , China

金属学报(英文版)

Experimental investigation of hot deformation behaviour of Nb-bearing low carbon steel 14MnNb was carried out by Gleeble 1500 simulator.Regressive analysis was made of the re- lationship between deformation onditions and steady state flow stress during hot deformation and the peak fliw stress corresponding to dynamic recrystallization.Clarification was also described for the influence of strain-induced Nb(C.N)precipitation on the activation energy of deformation.On the basis of analyzing the processes of dislocation multiplication and re- coveries from cross-slip of screw dislocation and from climb of edge dislocation during plastic deformation of metals.the theoretical mpdel to predict flow stress under the condiltions of dy- namic recorery and recrystallization occirred simultancously was developed,The prediction about flow stress in practice,under various deformation conditions by the model seems in fair agreement with the experimental results.

关键词: flow stress , null , null , null

VARIATION OF HYDROGEN CONTENT IN MOLTEN HEAVY RAIL STEEL AT PANZHIHUA IRON AND STEEL COMPANY

XIAN Aiping LI Peiji CHEN Wenxiu WANG Yikang Institute of Metal Research , Academia Sinica , Shenyang , ChinaCHEN Renyi MEI Dongsheng Panzhihua Institute of Iron and Steel Research , Panzhihua , China associate professor.Institute of Metal Research , Academia Sinica , Shenyang 110015 , China

金属学报(英文版)

At panzhihua Iron and Steel Company,hydrogen content in molten heavy rail steel is rather low during smelting in the oxygen top-blown converter,and sloightly increases in tapping and pouring.Average H content varies from 2.0(dry season)to 2.4 ppm(rainy season)at smelt- ing end;2.8 ppm in ladle;and 2.1 ppm(dry season)to 2.3 ppm(rainy season)in mould, which is on a level with RH vacuum circle.The low hydrogen content in molten steel,which is due to both the very dry climate in Panzhiihua region and the LD smelting process,is the main reason why there is little flake in the heavy rail produced by Panzhihua Iron and Steel Com- pany.

关键词: smelting , null , null , null , null

EFFECT OF REMOVING HYDROGEN FROM HEAVY RAIL STEEL BLOOMS BY STACK COOLING IN PANZHIHUA IRON AND STEEL COMPANY

XIAN Aiping LI Peiji CHEN Wenxiu WANG Yikang Institute of Metal Research , Academia Sinica , Shenyang , ChinaCHEN Renvi MEI Dongsheng Panzhihua Institute of Iron and Steel Research , Ministry of Metallurgical Industry , Panzhihua , China associate professor , Institute of Metal Research , Academia Sinica , Shenyang 110015 , China

金属学报(英文版)

The determination of dffusible hydrogen in U71Mn heavy rail steel,and hydrogen diffusivity as well as the hydrogen distribution in the cross section of blooms with stack cooling were stu- died.The results showed that,most of the hydrogen in blooms of heavv rail steel is diffusible, the hydrogen diffusivity in U71Mn rail steel blooms at room temperature is(0.85—1.02)× 10~(-6)cm~2/s,after stack cooling,the hydrogen content in bloom will decrease greatly which is helpful to form the flake-free phenomenon in the heavy rail produced by Panzhihua Iron and Steel Company.

关键词: rail steel , null , null , null

Progress of Sintering Technology in Handan Iron and Steel Company

钢铁研究学报(英文版)

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Investigation on Initial Stage of Electroless Deposition on Low Carbon Steel and Pure Iron

Yiyong WU , Yongqian WANG , Yongzhong ZHANG and Mei YAO (School of Materials Science and Technology , Harbin Institute of Technology , Harbin , 150001 , China)Xinguo HU(Applied Chemical Department , Harbin Institute of Technology , Harbin , 150001 , China)

材料科学技术（英文）

Initial process is influenced by substrate microstructure according to the study of initial stage of electroless plating on low carbon steel and pure iron. For low carbon steels, depositing on cementite is prior to that on ferrite, and for pure iron, the grain boundaries and some favourable grains are deposited more easily. The initial reactions of electroless depositing of Ni-P alloy have been tentatively proposed

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Mechanism of Bainite Nucleation in Steel, Iron and Copper Alloys

Mokuang KANG , Ming ZHU , Mingxing ZHANG

材料科学技术（英文）

During the incubation period of isothermal treatment (or aging) within the bainitic transformation temperature range in a salt bath (or quenching in water) immediately after solution treatment, not only are the defects formed at high temperatures maintained, but new defects can also be generated in alloys, iron alloys and steels. Due to the segregation of the solute atoms near defects through diffusion, this leads to non-uniform distributions of solute atoms in the parent phase with distinct regions of both solute enrichment and solute depletion. It is proposed that when the Ms temperature at the solute depleted regions is equal to or higher than the isothermal (or aged) temperature, nucleation of bainite occurs within these solute depleted regions in the manner of martensitic shear. Therefore it is considered that, at least in steel, iron and copper alloy systems, bainite is formed through a shear mechanism within solute depleted regions, which is controlled and formed by the solute atoms diffusion in the parent phase.

关键词: Pre-bainite phenomenon , null , null , null

Super-steel Produced by Unrecrystallized Austenite Region Rolling in High-speed Wire Mill

Lin HU , Xiaodong HU , Peng GAO , Hongyang ZHAO , Dong-Ying Ju

材料科学技术（英文）

Based on the discussing of the mechanisms of grain refinement strengthening and deformation induced transformation, the characteristics of controlled rolling and controlled cooling for high-speed wire were analyzed. Aiming at the problems of wire mill in Anshan Iron & Steel Co., turbulent cooler and spray cooler on the Stelmor conveyor were developed. Super-steels had been developed for Q235 steel through unrecrystallized austenite region rolling. The constitution and properties of the wire on the coil overlap zone were also improved. This proved the possibility that super-steels can be developed in high-speed wire mill.

关键词: Super-steel , null , null , null

Treatment of Reused Comprehensive Wastewater in Iron and Steel Industry With Electrosorption Technology

ZHANG Yunhua , GAN Fuxing , LI Meng , WANG Dihua , HUANG Zhongmai , GAO Yunpeng

钢铁研究学报(英文版)

Electrosorption technology was used to treat the reused comprehensive wastewater from iron and steel industry. A problem of relatively high conductivity of wastewater which greatly affects the reuse was examined, and industrial test was conducted for the reused water advanced deionization and purification in a comprehensive wastewater treatment plant of WISCO [Wuhan Iron and Steel (Group) Corporation]. The results of the onsite industrial test showed a satisfactory treatment performance for the reused water even at a flow rate of 1000 L/h in a standard 500 L/h unit. The average conductivity decreased by about 70%, from 580-780 μS/cm to 100-350 μS/cm. The average removal efficiency of Cl- and Ca2+ was about 75% and 68%, respectively, and CODCr of the treated water was also reduced in some degree while the pH value was almost unchanged. The energy consumption was as low as 06 kWh/t, which was remarkably superior to the conventional technologies. Therefore, it is entirely feasible that the novel electrosorption technology can be used in enhanced desalination and purification treatment of reused comprehensive wastewater in iron and steel industry.

关键词: electrosorption , desalination , purification , conductivity , industrial reused water

Abrasive Wear Behavior of High Chromium Cast Iron and Hadfield Steel—A Comparison

Mehdi Mazar Atabaki , Sajjad Jafari , Hassan Abdollah-pour

钢铁研究学报(英文版)

Abstract： Wear properties of two different crushers used for grinding raw materials of cement industry are compared using pin-on-disk wear test. The wear test was carried out with different loads on a pin. Abrasive wear behavior of two alloys was evaluated by comparing mass loss, wear resistance, microhardness and friction coefficient. The microstructure of the specimens was detected using optical microscope. The results showed that abrasive wear of high chromium cast iron is lower than that of Hadfield steel. Due to the presence of M7C3 carbides on the high chromium cast iron matrix, impact crushers exhibited higher friction coefficient.

关键词: Key words: abrasive wear , Hadfield steel , high chromium , cast iron

Formation of Hearth Sediment during Vanadium Titano-magnetite Smelting in Blast Furnace No.7 of Chengde Iron and Steel Company

Xiao-jie LIU , Qing L , Shu-jun CHEN , Zhen-feng ZHANG , Shu-hui ZHANG , Yan-qin SUN

钢铁研究学报(英文版)

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