Qiqihar, China
Qiqihar, China

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Jing H.M.,Anhui University of Technology | Jing H.M.,Nanjing University of Science and Technology | Jing H.M.,Yangzhou Chengde Steel Pipe Co. | Wang B.,Anhui University of Technology | And 6 more authors.
Advanced Materials Research | Year: 2011

The use of P92 is becoming more and more widespread in high temperature steam pipe of super-ultracritical power station boilers, it's key material for the manufacture of boiler's four main pipes. The properties of P92 are closely related with its microstructure, and the microstructure of P92 has strong relationship with its' composition and hot processing technology. Three types of P92 with different composition have been prepared. The relationship of delta ferrite between composition, smelting and heat forging process has been investigated for these three samples. The results show that the delta ferrite can be avoided by the adjustment of composition and making process, the delta ferrite will occurred in the matrix of P92 which without delta ferrite before heat treatment if the heat temperature exceed 1200°C , the delta ferrite existed in P92 ingot matrix resulted from the composition cannot be eliminated by hot working and heat treatment. © (2011) Trans Tech Publications.

Xiong H.-J.,Beiman Special Steel Co. | Shi Z.,Kunming University of Science and Technology | Li B.,Beiman Special Steel Co. | Xie K.-L.,Beiman Special Steel Co. | And 2 more authors.
Journal of Iron and Steel Research | Year: 2015

In the process of research on Huimin high-phosphorus iron smelted by smelting reduction, the mass action concentrations of structural units or ion couples of CaO-MgO-FeO-Al2O3-SiO2-P2O5 slags were calculated by using of VB 6.0 in combination with select the main element relaxation iterative method based on the ion and molecule coexistence theory, and the desulfurization model of this slags is developed, sulfur distribution ratio calculated from this model had better agreement with that tested in process, which indicates the desulfurization model can be applied in high efficient dephosphorization slags.

Shi Z.,Kunming University of Science and Technology | Xiong H.,Beiman Special Steel Co.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2014

In combination with Huimin high-phosphorus iron smelted by smelting reduction and HIsmelt ironmaking technology, which have the advantages of high efficient dephosphorization, CaO-SiO2-Al2O3-MgO- FeO-P2O5 slags with basicity R (mass ratio of CaO to SiO2)ranging from 0.8 to 1.4, Al2O3 ranging from 6.4% to 15.4%, P2O5 ranging from 0 to 3% and the content of MgO and FeO fixed as 4% and 6% respectively, are studied. The slags are synthesized by reagent grade. The mineral composition and microstructure of the slags are studied with scanning electron microscope and the effects of changes in the composition of smelting reduction slags on its viscosity are studied by RTW-10 melt comprehensive physical properties measuring apparatus. Results show that the mineral structure of slags are mainly composed of melilite(gehlenite and akermanite), which is characterized by square and thick skeleton form. The viscosity decreases with the increasing of the slag basicity at fixed P2O5 or Al2O3 mass fraction, increases with the increasing of Al2O3 mass fraction at fixed slag basicity or P2O5 mass fraction, and increases with the increasing of P2O5 mass fraction at fixed slag basicity or Al2O3 mass fraction.

Sun T.,University of Science and Technology Beijing | Yue F.,University of Science and Technology Beijing | Wu H.-J.,University of Science and Technology Beijing | Guo C.,University of Science and Technology Beijing | And 2 more authors.
Journal of Iron and Steel Research International | Year: 2016

The solidification structure of a continuous casting large round billet was analyzed by a cellular-automaton-finite-element coupling model using the ProCAST software. The actual and simulated solidification structures were compared under mold electromagnetic stirring (MEMS) conditions (current of 300 A and frequency of 3 Hz). Thereafter, the solidification structures of the large round billet were investigated under different superheats, casting speeds, and secondary cooling intensities. Finally, the effect of the MEMS current on the solidification structures was obtained under fixed superheat, casting speed, secondary cooling intensity, and MEMS frequency. The model accurately simulated the actual solidification structures of any steel, regardless of its size and the parameters used in the continuous casting process. The ratio of the central equiaxed grain zone was found to increase with decreasing superheat, increasing casting speed, decreasing secondary cooling intensity, and increasing MEMS current. The grain size obviously decreased with decreasing superheat and increasing MEMS current but was less sensitive to the casting speed and secondary cooling intensity. © 2016 Central Iron and Steel Research Institute.

Liu W.,Control Iron and Steel Research Institute, China | Liu L.,Control Iron and Steel Research Institute, China | He P.,Control Iron and Steel Research Institute, China | Gao H.,Beiman Special Steel Co. | Lu C.-H.,Beiman Special Steel Co.
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

Based on the measurement of surface temperature on the bloom, mathematical model for solidification heat transfer is presented according to modifying the heat transfer coefficient of different cooling zone and the calculating results of the model are applied to the static soft reduction well. The results show that the best casting condition for soft reduction is liquid steel overheat 10-30°C, secondary intensity 0.28 L/kg, casting speed 0.85 m/min and reduction amount 8mm. Using soft reduction technology can decrease the grade of center porosity from 2.0-2.5 to 1.0-1.5, the V-shape segregation and center shrinkage cavity are improved, and the center average carbon segregation index of the bloom decreased from 1.17-1.26 to 1.07-1.13.

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