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Chu S.L.,Qinhuangdao Shouqin Metal Materials Co Ltd
Advanced Materials Research | Year: 2014

In the course of systematic modeling, the artificial neural networks method is studied. In allusion to the defect of grads descension of traditional back propagation network algorithms, some improving measures have been taken to determine the optimal prediction and analysis model. These measures include adaptive learning, additive momentum, reasonable selection of drive function, and using genetic algorithm to optimize the input parameters. And to learn and predict the utilization of blast furnace production data, better application result is acquired. © (2014) Trans Tech Publications, Switzerland.


Li J.,Northeastern University China | Zhao D.-W.,Northeastern University China | Liu X.-H.,Northeastern University China | He Y.-C.,Qinhuangdao Shouqin Metal Materials Co. | Sui H.-L.,Shougang Institute of Technology
Journal of Iron and Steel Research | Year: 2010

The industrial trials of 80-85mm gauge heavy plate steel were conducted by using TMCP (thermal-mechanical control process) and RCR+ ACC ( recrystallization control rolling+ accelerated cooling) processes with non-microalloyed Q345D continuous cast slabs, and the effect of both rolling processes on microstructure and mechanical property was studied. The results indicate that both processes can realize the good match between microstructure and mechanical property. Comparing with the TMCP process, RCR+ACC process rolled plate has good property homogeneity in thickness direction, also the good microstructure uniformity in 1/4 thickness layer and the middle layer; and this plate is rolled in austenite high temperature area, the resistance of deformation is reduced, which is in favor of decreasing the load of mill or implementing low speed heavy reduction rolling, moreover, leaving out the waiting time for temperature in TMCP process, and decreasing the rolling pass, so the heavy plate steel rolling process is simplified.


Song X.,Qinhuangdao Shouqin Metal Materials Co Ltd | Wang G.-J.,Qinhuangdao Shouqin Metal Materials Co Ltd | Zhang G.-D.,Qinhuangdao Shouqin Metal Materials Co Ltd | Wang K.,Qinhuangdao Shouqin Metal Materials Co Ltd | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2014

The 70 mm heavy gauge and high strength Q890 steel was successfully developed by proper chemical composition design, optimized thermo-mechanical control process (TMCP) and quenching and tempering process(QT) The better mechanical properties are obtained. The yield strength at the center and quarter of the plate thickness is between 895 MPa and 976 MPa, and the tensile strength is in the range of 949 MPa to 1020 MPa. The minimum value of elongation is 15.5%, and its maximum value can reach 18.0%. The Charpy impact energy at -20 ℃ and -40 ℃ are 165-209J and 103-197J, respectively. The requirements of GB/T 16270-2009 about mechanical properties to Q890 steel are fully met. Through tempering simulation trial, strength of the plate decreases, but ductility and toughness is improved with the tempering temperature increasing. The better comprehensive properties of strength, ductility and toughness can be achieved for the Q890 steel after tempering at 600 ℃.


Wang H.-Y.,Qinhuangdao Shouqin Metal Materials Co.
Kang T'ieh/Iron and Steel | Year: 2013

Contact pressure and its' distribution mode between backup roll and work roll are critical to flatness and service life of rollers. In order to investigate the pressure distribution law and make it more uniform, a thermal-deformation coupled finite element model was setup for wide-thick plate rolling process in a 4100mm mill based on elastic-plastic nonlinear finite element method, and the deformation of both hot plate and rolls was coupled in this model. From the numerical simulation results, the contact pressure distribution and roll gap shape are presented, by which, the backup roll profile curve is optimized to be quadratic and its' shoulder form is improved to be parabolic curve. The service life of backup roll and flatness of plate are improved with the new roll profile.


Liu D.,Yanshan University | Ren T.,Yanshan University | Jin X.,Yanshan University | Ma Q.,Qinhuangdao Shouqin Metal Materials Company Ltd
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

A concept of motion integration was presented to improve the efficiency and to reduce the space of series mechanisms. Combining with movable tooth gear and noncircular gear theory, the motion integration mechanism with roller movable tooth was proposed. Firstly, a eccentric circle was selected as the wave generator. A tooth profile model of the inner ring was built under any transmission ratio, with continuous transmission conditions discussed. Then a mathematical relationship in the maximal number of movable teeth, the number of period of transmission ratio and the number of inner ring teeth were studied. When the number of movable teeth was less than two, a parallel movable tooth gear was constructed to realize any speed ratio. Finally, the design process of a motion integration mechanism with roller movable tooth was given to achieve the transmission ratio of series noncircular gear system, which laid the foundation for applying the new gear, and guided the research of other movable tooth gears. © 2016, China Mechanical Engineering Magazine Office. All right reserved.


Zhang G.,Qinhuangdao Shouqin Metal Materials Co. | Song X.,Qinhuangdao Shouqin Metal Materials Co. | Chen T.,Qinhuangdao Shouqin Metal Materials Co. | Li Q.,Qinhuangdao Shouqin Metal Materials Co. | You L.,Qinhuangdao Shouqin Metal Materials Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Effect of tempering temperature on low temperature toughness and microstructure of low carbon bainitic X80 pipeline steel was studied by mechanical properties test and microstructure analysis. The results indicate that the strength and low temperature toughness have the best matching at 300 ℃ tempering for X80 low carbon bainitic pipeline steel. The YS (yield strength) remains at 625 MPa. The charpy absorbed energy at -40 ℃ reaches 315 J and 268 J at -60 ℃. TMCP process produced low carbon pipeline steel is mainly GB (granular bainite) structure. The microstructure remains the same with the as rolled state after tempered at 300 ℃ for 2 h. The GB starts to coarsing and some PF (polygon ferrite) starts to appear in the microstructure after tempered at 600 ℃. The low temperature toughness improvement is due to the transform of M/A components at the grain boundary from islands to spots and strips in the process of tempering. All these microstructure can inhibit the propagation of the crack.


Li X.-L.,Qinhuangdao Shouqin Metal Materials Co. | Yang C.-W.,Qinhuangdao Shouqin Metal Materials Co.
Kang T'ieh/Iron and Steel | Year: 2013

The controlled cooling process after normalizing is the combined process of cooling process and normalizing. Because the temperature of austenization is as the same as the normalizing, the finer microstructure of ferrite and pearlite can be obtained after water cooling. Experimental study was performed in the development of 120 mm E36 ship plate steel, and the "weak water-cooling" model of quenching experiment was used after normalizing. The final cooling temperature was between 600°C and 650°C. Compared with the traditional air cooling after normalizing, the plasticity doesn't decrease, and the strength increases by about 15MPa. Low-temperature toughness is good, especially the -60°C impact energy in the center is over 100J. The more fine and uniform ferrite-pearlite microstructure can be obtained by experiment. The mechanical properties index can meet the standard requirement of E36 ship plate. The results have important significance in the development of heavy gauge ship plate.


Liu Y.-X.,Qinhuangdao Shouqin Metal Materials Co. | Zhu Q.-M.,Qinhuangdao Shouqin Metal Materials Co.
Corrosion and Protection | Year: 2010

Abstract Using sulfuric acid as electrolyte, the effects of electrolyte conccntration current density, oxidizing time and electrolyte temperature on oxide film's thickness and electrochemical behavior were studied. The optimal anodic oxidation process was determined. The obtained anodic film had good corrosion resistance in neutral salt test and uniform gray surface. The aniodic oxidation technology with the advantages of simple process and easy operating would ha wide application prospect.


Tian Y.,Northeastern University China | Li Q.,Qinhuangdao Shouqin Metal Materials Co | Wang Z.-D.,Northeastern University China | Wang G.-D.,Northeastern University China
Journal of Materials Engineering and Performance | Year: 2015

X70 (steel A) and X80 (steel B) pipeline steels were fabricated by ultra fast cooling (UFC). UFC processing improves not only ultimate tensile strength (UTS), yield strength (YS), yield ratio (YS/UTS), and total elongation of both steels, but also their Charpy absorbed energy (AK) as well. The microstructures of both steels were all composed of quasi polygonal, acicular ferrite (AF), and granular bainite. MA islands (the mixtures of brittle martensite and residual austenite) are more finely dispersed in steel B, and the amount of AF in steel B is much more than that in steel A. The strength of steel B is higher than that of steel A. This is mainly attributed to the effect of the ferrite grain refinement which is resulted from UFC processing. The finely dispersed MA islands not only provide dispersion strengthening, but also reduce loss of impact properties to pipeline steels. UFC produces low-temperature transformation microstructures containing larger amounts of AFs. The presence of AF is a crucial factor in achieving desired mechanical properties for both steels. It is suggested that the toughness of the experimental steel increases with increasing the amount of AF. © 2015, ASM International.


Wang Q.-M.,Qinhuangdao Shouqin Metal Materials Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

Effect of the delay after hot rolling on yield ratio of the test steel microalloyed with Nb were analyzed by means of transmission electron microscope, scanning electron microscope, electron backscatter diffraction(EBSD) and mechanical properties tests. The results show that the delay after hot rolling can increase ferrite grain size, reduce the dislocation density in ferrite grain, affect the lamellar distribution in pearlite colony, increase the thickness of carbide lamellar and also make the yield ratio lower. At 770 °C and 730 °C of delay temperatures, the yield ratios of test steel decrease respectively to 0.738 and 0.724 from 0.765 without delay. When taking into account the general strength requirements, the optimized delay temperature of test steel is (770 ±10) °C.

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