Xinyu Iron and Steel Co

Xinyu, China

Xinyu Iron and Steel Co

Xinyu, China
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Fu Z.,Xi'an University of Architecture and Technology | Yang J.,Xi'an University of Architecture and Technology | Cao R.,Xinyu Iron and Steel Co. | Li G.,Xi'an University of Architecture and Technology | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2017

Taking the AH36 steel as the research object, the cooling system of the continuous casting billet and the tensile test specimen were simulated by Gleeble-3800 thermal simulation machine. The fracture microstructure was characterized by means of metallographic microscope. The hot ductility of the specimen under different cooling conditions was studied. The effect of cooling process on the transverse cracks of casting billet was cleared. The results show that the reduction of area of the sample using traditional cooling process is less than 40% at 800℃, with brittle featured fracture its thermoplastic and anti crack sensitivity are low, which is due to ferrite and pearlite uneven distribution and chainlike distribution coarse grain precipitates along the grain boundaries. Under the condition of thermal cycling cooling process, the reduction of area of the sample is 53.30% at 800℃and the microstructure is uniform with fine grain, and no chain-like precipitates. Thermal cycling cooling system can effectively improve the the surface hot ductility of continuous casting billet, reduce crack sensitivity, and eliminate the corner cracks. © 2017, Editorial Office of "Jinshu Rechuli". All right reserved.


Xu X.-Q.,Northeastern University China | Xu X.-Q.,Control Iron and Steel Research Institute, China | Hao X.-D.,Control Iron and Steel Research Institute, China | Fu S.-L.,Xinyu Iron and Steel Co. | And 3 more authors.
Journal of Iron and Steel Research | Year: 2017

For hot rolled strip, a more flexible cooling control strategy is required to make the strip cooled according to the cooling path set in advance, and consequently take full advantage of the phase transformation and precipitation strengthening during the cooling process. Thus, a new method based on temperature observer for strip temperature control was proposed, in which strip temperature observer based on physic models was developed to monitor the strip temperature and, at the same time, the model parameters of the observer were revised according to the measured temperature. On this condition, an optimal controller was applied to optimize the valves setting in each cooling unit, as well as to ensure the minimum deviations between the observed temperature distribution curve and the desired one. Practical application shows that this method can not only control the strip temperature accurately, but also overcome the limitations of fixed cooling pattern and fulfill the objective of cooling path control.


Feng X.,Xinyu Iron and Steel Co. | Luo D.,Jiangxi University of Science and Technology | Sun L.,Xinyu Iron and Steel Co. | Zhao Q.,Jiangxi University of Science and Technology | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2016

The static continuous cooling transformation curves of E690 steel for offshore platform were measured using dilatometry and Gleeble-3800 thermo-mechanical simulator for steel phase transition point. Simultaneous determination the dilatometric curves of under-cooled austenite during continuous transformation under different cooling rate. With metallographic-microhardness method, the effect of different cooling rate on microstructure and performance of E690 steel for offshore platform was analyzed. The results show that, when the cooling rate are 0.05 to 0.5℃/s, the cooling transformation phase is granular bainite. With the cooling rate increases to 0.1-3℃/s, the lath bainite evidently increases. When cooling rate is up to 5℃/s, the microstructure becomes lath bainite and lath martensite. © 2016, Editorial Office of "Jinshu Rechuli". All right reserved.


Qiu Z.S.,University of Science and Technology Beijing | He A.R.,University of Science and Technology Beijing | Chen C.C.,University of Science and Technology Beijing | Peng J.M.,Xinyu Iron and Steel Co. | Tang X.Y.,Xinyu Iron and Steel Co.
Applied Mechanics and Materials | Year: 2014

Aim at solving the problem of ribbing defect is found on cold rolling strips which is caused by bad hot strip shape, analyze the reason from the hot rolling process, and study out that there are some reasons such as uneven wear of rolls can lead to ribbing defect. Roll contour, roll shifting model, rolling plan were optimized and got a geart effect: the hot strip shape being better, the production being more stable, the ratio of ribbing defect decreasing obviously(from 2.2% to 0.3%). The quality of their product has been improved a lot. © (2014) Trans Tech Publications, Switzerland.


Xia W.-Y.,Control Iron and Steel Research Institute, China | Xia W.-Y.,Xinyu Iron and Steel Co. | Zhu Z.-H.,Control Iron and Steel Research Institute, China | Gan Y.,Control Iron and Steel Research Institute, China
Kang T'ieh/Iron and Steel (Peking) | Year: 2011

Based on experimental investigation of precipitates behavior, formation mechanism on crack of Micro-alloyed steel during hot charging process was analyzed by binding micro-structural evolution and thermal stress changing. The results show that different convey way and hot charging temperature have significantly effect on precipitates behavior in charging slab. But the status of precipitates in reheating slab is similar when convey way sand hot charging temperatures are different. The hot charging process crack of micro-alloyed steel was formed by resultant force of precipitates behavior, micro-structural evolution and thermal stress changing. The micro-structural evolution that is the formation of proeutectoid ferrite omentum on austenitic grain boundaries in A r1-A r3 is the leading role on formation of hot charging process crack.


Sun L.,University of Science and Technology Beijing | Wang F.,University of Science and Technology Beijing | Yan B.,Xinyu Iron and Steel Company
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

Microstructure and mechanical properties of coarse gain zone and α+γ zone of HAZ in E690 steel for offshore platform was investigated with thermal simulation, microstructure analysis and mechanical property test. The results show that with the increase of weld heat input, microstructure of coarse grain zone transforms into bainite in stead of martensite, impact value increases firstly then decreases and reaches maximum at t8/5=20-30 s and the hardness decreases. For α+γ zone, the microstructure has a tendency to grow up with the increase of weld heat input, and the impact property and hardness decreas. However, the reduction of impact toughness and hardness in α+γ zone is obviously less than these of coarse grain zone with weld heat input increasing.


Chen J.-H.,Northeastern University China | Chen J.-H.,Xinyu Iron and Steel Co | Wu H.,Xinyu Iron and Steel Co | Zhang W.,Northeastern University China | Zhao D.-W.,Northeastern University China
Journal of Iron and Steel Research | Year: 2010

The softening behavior of hot deformed austenite of HSLA Q390 was studied by double-pass compression method, and the influence of temperature and interval time was analyzed. The softening percentage of static recrystallization was defined by the 0. 2% stress offset method. The static recrystallization activation energy of Q390 was determined and the static recrystallization kinetics model to predict the evolution of softening was devoleped.


Zhu J.,Xinyu Iron and Steel Co. | Zhu J.,University of Science and Technology Beijing | Li J.,University of Science and Technology Beijing | Sun L.,University of Science and Technology Beijing
Advanced Materials Research | Year: 2011

A water modeling approach was employed to investigate the effects of gas injection condition on the fluid flow in a two-strand tundish. The rational parameter of argon injection was determined as the optimized positions. Adopting the Case of weir-gas-dam could prolongs fluid's retention, stagnation and peak periods in the tundish properly. The dead zone could be reduced to 17.4%. The flow pattern which was oberved with ink showed that the flow condition was improved greatly in Case 2(WGD), favoring the mixture of liquid steel and the inclusion removal. © (2011) Trans Tech Publications, Switzerland.


Hao X.,University of Science and Technology Beijing | Wang X.-H.,University of Science and Technology Beijing | Yang G.-W.,University of Science and Technology Beijing | Qin Y.-M.,University of Science and Technology Beijing | Zhao H.-M.,Xinyu Iron and Steel Co.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2014

Three heats of industrial trials were performed to investigate the cleanliness of A32 ship plate steel produced by a BOF-LF-RH-CC route. The variation of T.O and [N] contents as well as the transformation route and mechanism of inclusions in the steel were studied by system sampling during secondary refining processes. The steel have high level cleanliness with the T.O content under 2×10-5 and the [N] content under 4×10-5 in tundish samples. The T.O content, number density and average size of inclusions decrease during the LF refining process, and the inclusions transform into a CaO-MgO-Al2O3 ternary system. In the RH refining process, the T.O content and the number density of inclusions decrease, but the average size of inclusions increases. During calcium treatment, the number density of inclusions increases but the average size of inclusions decreases, and the inclusions transform into a CaO-Al2O3 -CaS ternary system. ©, 2014, University of Science and Technology Beijing. All right reserved.


Xia W.-Y.,Control Iron and Steel Research Institute, China | Xia W.-Y.,Xinyu Iron and Steel Co Ltd | Wang Y.-C.,Control Iron and Steel Research Institute, China | Wang M.-L.,Control Iron and Steel Research Institute, China | Qiu S.-T.,Control Iron and Steel Research Institute, China
Journal of Iron and Steel Research | Year: 2011

To promote the precipitation of the dispersed oxide particles is an effective means for improving the heat afect zone toughness. By thermodynamic calculation of Al-Ti-O system, the behavior of the oxide precipitation during solidification in Al, Ti complex deoxidized steel was analyzed theoretically and the optimum processing condition for forming Ti2 O3 nuclei was put forward at the beginning of solidification. The results show that small particles of Ti2O3 and complex precipitates can be precipitated by strict control the content of Al, Ti and the oxygen activity. The morphology, size and distribution of precipitates were statistically analyzed.

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