钢铁研究学报(英文版)
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2011年 18卷 4期
刊出日期：2011-04-15
材料
工艺
工艺
1
WANG Qian,LU Yongjian,HE Shengping,WANG Lijuan,K C Mills
Development of Test Method for Measuring Sintering Temperature of Mould Fluxes
Excessive sintering of mould fluxes can readily cause defects and sticker breakouts in continuously cast strands. Studying the sintering property is important to minimize problems related to sintering arising from the use of mould fluxes in continuous casting. An effective method of measuring the apparent sintering temperature has been developed in this study. The method is based on monitoring the formation of cavities caused by melting of samples. For monitoring, the differential pressure of an inert gas flow was measured through a set volume of sample (mould flux A) held in a furnace tube. The apparent sintering temperature was defined in this test to determine sintering process. The sintering properties of fluxes with various contents of carbon black were examined along with identification of mineralogical phases and the nature of the sinter for samples of mould flux A held for one hour at different temperatures. The experimental results indicated that the apparent sintering temperature (AST) was a useful parameter to assess the threat of problems related to sinter.
2011 Vol. 18 (4): 1-6 [
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7
FU Wei-guo,WEN Yongcai,XIE Hongen
Development of Intensified Technologies of VanadiumBearing anomagnetite Smelting
It was very difficult for the smelting of vanadiumbearing titanomagnetite by blast furnace because the content of TiO2 of blast furnace slag could amount to 20%-25%. After long term development and continuous improvement, special intensified smelting technologies for vanadiumbearing titanomagnetite by blast furnace were obtained and improved gradually. With the improvement of beneficiated material level and equipment level, smelting intensity has been increased gradually and the highest comprehensive smelting intensity reached 145 t/(m3·d). Technicaleconomic indexes of blast furnace have also been increased remarkably. The highest utilization coefficient exceeded 27 t/(m3·d) on the condition that the burden grade was only about 50%.
2011 Vol. 18 (4): 7-10 [
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11
LI Junguo,ZENG Yanan,WANG Jianqiang,HAN Zhijie
Simulation of Flow Field of Oxygen Lance Gas Jet Utilized for 50 t Converter
Based on the operating conditions of oxygen lance utilized for a 50 t converter in Tangsteel, gas jet flow fields of three types of oxygen lances were simulated by FLUENT software. The influence of lance configuration and lance level on penetrating area was studied through cold model experiment. The results showed that the gas flow velocities of fourhole, variable angle fourhole and fivehole oxygen lances declined rapidly with an increase in gas jet length within 1 m, 1 m and 08 m, respectively. Besides, the multi gas streams sprayed from these three lances should be syncretized at 16 m, 17 m and 14 m, respectively. At the highest lance level, the effective penetrating area of these three lances could be 0255 m2, 0385 m2 and 00907 m2, respectively. It was suggested that the effective penetrating area of variable angle fourhole oxygen lance was the biggest, while that of fivehole oxygen lance was the least. The validity of numerical simulation results was proved through cold model experiment. The lance level was suggested to be controlled in the range of 1-16 m, 1-17 m and 08-14 m for the fourhole, variable angle fourhole and fivehole oxygen lances, respectively.
2011 Vol. 18 (4): 11-18 [
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JIANG Zhouhua,DONG Yanwu,LIANG Lianke,LI Zhengbang
Hydrogen PickUp During Electroslag Remelting Process
The pickup of hydrogen during electroslag remelting process for several slags consisting of CaF2Al2O3CaOSiO2MgO had been investigated. The laboratoryscale remelting experiments had been carried out in open air and waterfree argon atmosphere, and then the influencing factors were analyzed. It had been found that the hydrogen content in steel varied with different slag compositions. The compositions and state of slag had significant effect on the hydrogen level in steel. Partial return slag and premelted slag could avoid the hydrogen pickup especially in the early stages of the process. However, premelted slag was the optimum state to control the hydrogen pickup in steel. Experimental results indicated that waterfree argon atmosphere was very favorable to the control of hydrogen in steel in the normal remelting period.
2011 Vol. 18 (4): 19-23 [
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24
秦旭 朱超甫 郑立文
Research on Predicting Molten Steel Breakouts by the friction
通过对板坯连铸机结晶器液压伺服振动系统液压伺服油缸压力及活塞行程的检测，并应用结晶器伺服液压振动系统的运动方程，确定结晶器与连铸坯坯壳之间的摩擦力,找出该摩擦力在漏钢前的变化特征，用来预报粘结、裂纹及异物卷入漏钢，有效减少漏钢事故的发生。
2011 Vol. 18 (4): 24-29 [
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30
GUO Defu,HE Anrui,SHAO Jian,YANG Quan,WANG Zhongming,WANG bo
Research and Application of Flat Roll Technology in the Downstream Stands for CSP
CVC mills are generally used in the whole stands of CSP (Compact Strip Product). Their special “s” curve of work roll contour and shifting strategy aimed at controlling strip shape, and the characteristics of continuous casting and rolling production, which make the work roll wear in downstream stands seriously uneven, and easily form abnormal transverse profile at the rolling end. As a result, CVC mill configuration in the downstream stands can not meet the profile and flatness control requirement for schedule free rolling, and bring some difficulties in profile and flatness control for the subsequent cold rolling. Based on the characteristics of the shape control system of CSP production line, and combined with the theory of flat roll technology, a kind of technology solution of using flat roll in the downsteam stands for CSP hot strip mills was proposed. At last, industrial test was carried out in the last stand of Masteel CSP, and good results were obtained.
2011 Vol. 18 (4): 30-35 [
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36
JIAO Xiaohong,SHAO Liping,PENG Yan
Adaptive Coordinated Control for Hot Strip Finishing Mills
To further improve the control accuracy for strip dimension of hot strip mills, an adaptive control scheme is investigated for a hot strip finishing mill based on the decentralization and coordination among the controllers of gauge, tension and looper. Consequently, the adaptive controller designed can regulate simultaneously the strip exit thickness, the strip tension and the looper angle to ensure better performance of the strip quality of finishing mills. Moreover, the control scheme is proposed in consideration of the essential nonlinearity and the unavoidable friction phenomena in the mechanical system, so the controller can be efficient in a wider range of working situations. The simulation results of a model obtained from a real hot strip finishing mill show the effectiveness of the proposed control scheme in comparison with the conventional control method.
2011 Vol. 18 (4): 36-43 [
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材料
44
Jafar KhalilAllafi,Behnam AminAhmadi
Effect of Mold Hardness on Microstructure and Contraction Porosity in Ductile Cast Iron
The effect of mold hardness on the microstructure of ductile iron and the contraction porosity was investigated. Molds with different hardnesses (041, 048, 055, 062 MPa) and a sand mold prepared by Co2 method were used. The influence of silicon content on the induced expansion pressure owing to the formation of graphite was also investigated. The contraction during solidification can be compensated by an induced expansion owing to the graphite relief when the hardness of mold increases; therefore, the possibility of achieving a sound product without using any riser increases.
2011 Vol. 18 (4): 44-47 [
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48
ZHAO Xin,YANG Xiaoling,JING Tianfu
Processing Maps for Use in Hot Working of Ductile Iron
The hot deformation characteristics of ductile iron are studied in the temperature range of 973 to 1273K and strain rate range of 0001 to 1 s-1 by using hot compression tests. Processing maps for hot working are developed on the basis of the variations of efficiency of power dissipation with temperature and strain rate. The results reveal that the flow stress of ductile iron is sensitive to strain rate. In the processing map under strain of 07, a domain is centered at 1273 K and 1 s-1, and the maximum efficiency is more than 36%. According to the maps, the zone with the temperature range of 1173 to 1273 K and strain rate range of 01 to 1 s-1 may be considered as the optimum region for hot working.
2011 Vol. 18 (4): 48-51 [
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52
陈宏 丁铁锁 肖学山 赵钧良 江来珠
A New Economical Sigma-free Duplex Stainless Steel 19Cr-6Mn-1.0Mo-0.5Ni-0.5W-0.5Cu-0.2N
2011 Vol. 18 (4): 52-56 [
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58
方轶琉
Crack Properties of Lean Duplex Stainless Steel 2101 in Hot-formming Processes
2011 Vol. 18 (4): 58-62 [
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XU Lei,WEI Dongyuan,YU Yang,ZHANG Han,BAI Bingzhe
Effect of Microstructure on Corrosion Fatigue Behavior of 1500 MPa Level CarbideFree Bainite/Martensite DualPhase High Strength Steel
Influence of microstructure of the experimental steels on the corrosion fatigue behavior in 35% of NaCl aqueous solution was studied. Experimental results show that compared with the full martensite (FM) steel, the carbidefree bainite/martensite (CFB/M) steel has higher corrosion fatigue strength and corrosion fatigue crack threshold (ΔKthcf), and lower corrosion crack propagation rate [(da/dN)cf].
2011 Vol. 18 (4): 63-67 [
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68
YU Man,,LI Jingshe,TANG Haiyan,BAO Yaozong
Hot Working Characteristics of CorrosionResistant Alloys G3 and 825
The G3 and 825 alloys, with excellent combination of mechanical properties and corrosion resistance, can be used in hot, and acid environments. Thermal simulation tests were conducted on the alloys G3 and 825 in the THERMECMASTORZ simulator, at temperature between 1030 and 1300 ℃, with strain rate from 1 to 50 s-1 and strain ε=08. The variations of flow stress with deformation temperature and strain rate were presented. Change of alloy structure with hot deformation and effect of strain rate on alloy dynamic recrystallization have been studied through microstructure observation by OM, SEM and TEM. Moreover, hot plasticity characteristics of alloy were analyzed by temperaturereduction of area curves. The results showed that available hot working temperature for G3, G3Z and 825 was 1100 to 1240 ℃, 1130 to 1220 ℃ and 1050 to 1240 ℃, respectively. The reliable information on hot working in the alloy pilot production in steelwork is given.
2011 Vol. 18 (4): 68-72 [
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ZHANG Qunli,,YAO Jianhua,,Jyoti Mazumder
Laser Direct Metal Deposition Technology and Microstructure and Composition Segregation of Inconel 718 Superalloy
Multilayer of laser direct metal deposition (DMD) was prepared by depositing a gas atomized prealloyed powder with a composition close to Inconel 718 alloy on Inconel 718 high temperature alloy substrate. The effects of the DMD parameters on the buildup rate and the structure of the deposited layer were studied. The laser DMD sample was further processed by a solution treatment. The microstructure and property of the laser DMD zone before and after heat treatment were investigated as well. The results show that the laser parameters of actual laser power of 650 W, scanning speed of 58 mm/s, beam diameter of 1 mm, powder feed rate of 645 g/min, with a corresponding specific energy of 90-130 J/mm2, can be recommended as optimum parameters for high buildup rate of Inconel 718 alloy. Under the condition of optimized parameters, a directional solidification microstructure was obtained and the average distance between the columnar crystals was 5-10 μm. The microcomposition segregation was found between the columnar crystal trunk and columnar crystal. The elements of Nb, Mo, Ti concentrated in the columnar crystal trunk. After the heat treatment, the segregation was greatly minimized, and the segregation ratios were close to 1. The hardness of the laser deposited layer did not show obvious difference along the height of the layer either for the asdeposited layer or for the heat treated layer. However, the microhardness of the laser DMD zone after heat treatment was obviously higher than that after the asdeposited treatment. During the heat treatment process, some Nb and Morich phases precipitated and strengthened DMD layer.
2011 Vol. 18 (4): 73-78 [
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