Dongbei Special Steel Group Co.

Dalian, China

Dongbei Special Steel Group Co.

Dalian, China

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Yang X.-Y.,Shenyang Ligong University | Yang X.-Y.,CAS Shenyang Institute of Metal Research | Wang J.,Dongbei Special Steel Group Co Ltd
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Annealed electrodeposited Ni-Al nano-composite (A-ENC)and micro-composite, (A-EMC) coatings with γ'/γ structure were prepared by Ni-Al composite electrodeposition on nickel plate and subsequent vacuum heat treatment. Compared with A-EMC coatings, A-ENC coatings exhibits finer grain sizes of matrix and more Al in the γ-phase matrix. A-ENC coatings show beffer oxidation resistance than that of A-EMC coatings during oxidation in air at 1000°C for 20 h. It is argued that the early formation of a continuous Al2O3 layer in the A-ENC coatings during oxidation is responsible for its higher oxidation resistance. The size effect of the Al particles on the oxidation behavior of the composite coatings is discussed in detail.


Bo H.-G.,Dalian University of Technology | Zhang N.,Dongbei Special Steel Group Co. | Liu X.-B.,Dalian University of Technology | Huang X.-W.,Dalian University of Technology
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2010

Aiming at process industry characteristics and its Bill of Material (BOM) integration management requirements, on basis of analyzing the multi-form and mapping logic relationships of multi-view BOM, a batch-based approach for multi-view BOM transformation & mapping was presented. By associating batches, product type, application domain and product lifecycle, successive cells, substitutable cells, derivate cells, aggregating cells and the relevant transformation & mapping functions were defined. By identifying the batch-mapping characteristics of BOM, algorithms for multi-view BOM structure transformation and data mapping were put forward. And transformation mapping for multi-view BOM was realized. The BOM transformation and mapping model was proved to be feasible and effective by its application in enterprise. Thereby, the multi-view BOM integrated application model was set up for process industry.


Bo H.-G.,Dalian University of Technology | Zhang S.-R.,Dalian University of Technology | Liu X.-B.,Dalian University of Technology | Zhang N.,Dongbei Special Steel Group Co. | Liu J.,Dongbei Special Steel Group Co.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2011

Current methods of production capacity state time-series data preprocessing were difficult to ensure accurate data update timely and distortion-free production capacity sate description. To deal with these problems, a novel method supporting data dynamic reconfiguration for production capacity state time-series prediction was presented. Handling methods of production capacity sate data grooming, data cleaning, and data mapping procedures were studied and proposed. Data assimilation model of production capacity sate was set up based on dynamic data reconfiguration, rapid retrieval method of assimilation data was presented based on process feature attributes matching. Application studies and example analyses were used to validate the actual handling process of production capacity state time-series data in certain steel enterprise.


Meng Q.,Dalian University of Technology | Guo G.,Dalian University of Technology | Shi W.,Dalian University of Technology | Nan Z.,Dongbei Special Steel Group Co.
Advanced Materials Research | Year: 2012

In the actual production of iron and steel enterprises, alloy element yield is difficult to predict because it changes with different materials, processes, etc. Then planning weights of raw materials can't be calculated accurately so as to influence raw material cost planning control. Taking raw material attributes, process parameters, and etc. of smelting stage as the influence factors, the prediction model of alloy element yield is built. In order to increase the model's prediction accuracy, parameter optimization method for support vector regression (SVR) based on ant colony algorithm (ACO) is designed, which optimizes punish parameter, nuclear parameter and sensitive coefficient. The performance of the SVR algorithm with optimized parameters is compared with the grid search algorithm to verify that the former's performance and efficiency are better. The prediction method of alloy element yield based on the above improved support vector regression is built, whose regression and generalization performance are better compare with BP neural network, so that the relationship between influence factors and the alloy element yield is established. It can predict alloy element yield accurately according to the actual process and provide methods for realizing lean production in iron and steel enterprises. © (2012) Trans Tech Publications, Switzerland.


Liu Z.-T.,Dongbei Special Steel Group Co. | Zhou J.,Control Iron and Steel Research Institute, China | Ma D.-S.,Control Iron and Steel Research Institute, China | Qiu L.-P.,Dongbei Special Steel Group Co. | Liu B.-S.,Dongbei Special Steel Group Co.
Kang T'ieh/Iron and Steel | Year: 2013

Effect of such two different smelting process as "Vacuum Induction Furnace (VIF)+ Electroslag Remelting (ESR), Electric Furnace(EF)+LF+VD" of special steel on microstructure and mechanical property of H13 molds was studied. The results show that the process of VIF+ESR has some effects on increasing of the cleanliness, decrease of S, P and segregation in H13, which can enhance the transversal impact toughness to some extent in the core of H13 steel. The increase of impact toughness is restricted by a large number of primary carbides in microstructure of H13 steel.


Li B.-Z.,Northeastern University China | Zhang J.,Northeastern University China | Li C.-S.,Northeastern University China | Li Z.-Z.,Dongbei Special Steel Group Co. | Qiao B.,Dongbei Special Steel Group Co.
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2014

Using the MMS-300 thermal mechanical simulator, the deformation resistance of 20CrNi2Mo steel with strain 0~0.8 and strain rate 0.01 s-1~10 s-1 at 850 ℃~1150 ℃ in single pass axial compression process is tested and studied, and the relationship among deformation temperature, strain rate, degree of deformation and deformation resistance has been determined. The results show that the deformation resistance is affected remarkably by both strain rate and deformation temperature, the deformation resistance decreases with the increase of temperature, and it increases with the increase of strain rate. In addition, the interaction of deformation temperature, strain rate and degree of deformation affects the deformation resistance together. Through multiple non-linear regression analysis, the deformation resistance model for the 20CrNi2Mo steel is established, and this model proved to have good curve fitting characteristics and relatively high precision. ©, 2014, Beijing Res. Inst. of Mechanical and Elec. Technology. All right reserved.


Zhou J.,Control Iron and Steel Research Institute, China | Ma D.-S.,Control Iron and Steel Research Institute, China | Liu B.-S.,Dongbei Special Steel Group Co Ltd | Kang A.-J.,Dongbei Special Steel Group Co Ltd | Li X.-Y.,Control Iron and Steel Research Institute, China
Journal of Iron and Steel Research | Year: 2012

For the common banding segregation of H13 steel, research of banding segregation evolution law for H13 steel in different states was investigated systematically by metalloscope and SEM. The result shows that banding segregation of annealed H13 steel is attributable to thermal deformation of dendritic segregation with the characters of nonuniform spheroidizing, granular size and distribution of carbides. The heterogeneity of annealed structure affects the homogeneity of quenched and tempered structure of H13 steel directly, and also in the annealed structure, the heterogeneity of alloy elements and the primary eutectic carbides in the segregation banding are reserved till the final temper state, which has effect on the isotropic of H13 steel; Well annealed structure is the key factor for making H13 hot die steel with high performance.


Wang K.,Control Iron and Steel Research Institute, China | Wang K.,Dongbei Special Steel Group Co. | Si H.,Control Iron and Steel Research Institute, China
Journal of Iron and Steel Research International | Year: 2014

In order to confirm the segregation characteristic of phosphorus in an Fe-17Cr alloy at grain boundary, the phosphorus segregation was obtained by Auger electron spectroscopy. The results show that a maximum phosphorus segregation appeared at 450 °C for all specimens aged for 30 min at 350, 400, 450, 500, and 600 °C after being solution-treated at 1000 °C for 1 h. These results were analyzed by the characteristics of segregation peak temperature of non-equilibrium segregation. © 2014 Central Iron and Steel Research Institute.


Li Z.-X.,Northeastern University China | Li C.-S.,Northeastern University China | Zhang J.,Northeastern University China | Qiao B.,Dongbei Special Steel Group Co. | Li Z.-Z.,Dongbei Special Steel Group Co.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2015

In order to control the size and distribution of carbides and improve the cold formability of 1.0C-1.5Cr bearing steel, the effects of annealing parameters during isothermal spheroidization were studied. Mean diameter of carbides (D), interparticle spacing of carbides (s), number of carbides per area (n), and carbides particle size distribution were measured. The cold formability was evaluated through hardness and fracture strain. The results show that when austenitizing time increases from 0.5 to 7 hours or austenitizing temperature increases from 1033 K to 1153 K (760 °C to 880 °C), the values of D and s both increase, and the value of n decreases. With the increasing of second annealing time from 0.5 to 2 hours or the increasing of second annealing temperature from 953 K to 993 K (680 °C to 720 °C), the values of D and s tend to increase and the value of n decreases. According to the measured values of D, s, and n, two models describing their relationships were proposed. In addition, the hardness decreases with the increasing of D. The fracture strain changes slightly at first and then decreases significantly when the value of D exceeds 0.36 μm. © 2015, The Minerals, Metals & Materials Society and ASM International.


Li Z.,Northeastern University China | Li C.,Northeastern University China | Li Z.,Dongbei Special Steel Group Co. | Qiao B.,Dongbei Special Steel Group Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Spheroidizing process of GCr15 steel was simulated in pipe furnace and the effect of austenitizing temperature on spheroidization was investigated. The XRD and TEM were used to analyze the kinds of carbides and the electronic probe was used to observe the microstructure. The mean diameter, the number of carbides per unit area and mean carbides particle spacing were counted by Image-Pro Plus and Photoshop software. The results show that carbides in spheroidized GCr15 steel belong to M3C; with the increase of austenitizing temperature from 760℃ to 880℃, the mean diameter of carbides, which ranges from 0.35 μm to 0.45 μm, decreases first and then increases, the number of carbides per unit area decreases gradually, the carbides particle spacing increases and the hardness decreases. It is also found that the Vickers hardness is proportional to the area of ferrite-carbide interface, the fitting equation is HV=17.4S+190. In order to get good spheroidized structure, the austenitizing temperature should be controlled about 800℃. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.

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