Zhongyuan Special Steel Co.

Shuangqiao, China

Zhongyuan Special Steel Co.

Shuangqiao, China
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Liu A.-F.,Zhongyuan Special Steel Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2015

The aluminium alloy sample was dissolved with sodium hydroxide solution followed by acidification with dilute sulfuric acid. The solution was transferred into separating funnel. The boric acid in solution could react with certain amount of mandelic acid and malachite green to form ternary complex, which could be quantitatively extracted with benzene. The extract liquor was directly injected into the organic sampling system of inductively coupled plasma atomic emission spectrometer (ICP-AES). The content of boron in ammonium alloy was determined using B 249.678 nm as analytical line. The sample dissolution method, the extracting reagent, the extraction method and conditions (time and acidity) were selected. The physical interference was eliminated by matrix matching method. The mass fraction of boron below 1.00 mg/L was linear to the emission intensity. The linear correlation coefficient of calibration curve was r=0.9993. The detection limit of boron was 0.001 mg/L. The standard sample and owned sample were determined according to the experimental method. The found results of standard sample were consistent with the certified values. The relative standard deviation (RSD, n=10) of determination results of owned sample was less than 5%. The recoveries were between 80% and 100%. The proposed method was applicable for the detection of boron in aluminium alloy with minimum mass fraction of 0.0001%. ©, 2015, Central Iron and Steel Research Institute. All right reserved.


Liu A.-F.,Zhongyuan Special Steel Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2015

In order to reduce the lower limit of quantitation for determination of trace boron in iron and steel by inductively coupled plasma atomic emission spectrometry (ICP-AES) and meet the requirements for determination of boron in iron and steel with mass fraction less than 0.000 1%, a combined method by extraction separation and inductively coupled plasma atomic emission spectrometry was proposed for determination of trace boron in iron and steel. The sample was dissolved with hydrochloric acid-nitric acid mixed acid, sulfuric acid-phosphoric acid mixed acid and hydrofluoric acid in microwave digestion system. Then, the complex formed from boron and methylene blue was extracted with 1, 2-dichloroethane at pH 0.4-0.8. The 1, 2-dichloroethane organic phase was mixed with anhydrous ethanol for direct injection. The content of boron was determined under the selected instrumental parameters with B 249.678 nm as analytical line. The detection limit of method was 0.001 mg/L, which was 0.000 005% by converting it into the mass fraction of boron in iron and steel. The lower limit of quantitation was 0.000 05%. The proposed method was applied to the determination of trace boron in certified reference materials and synthetic samples of iron and steel. The results were consistent with the certified values or the theoretical values, and the relative standard deviation (RSD, n=10) was between 0.44% and 7.3%. The recoveries were 92%-100%. ©, 2015, Central Iron and Steel Research Institute. All right reserved.


Xu C.J.,University of Science and TechnologyLiaoning | Zeng Y.X.,University of Science and TechnologyLiaoning | Wang Z.L.,Zhongyuan Special Steel Co. | Li J.,University of Science and TechnologyLiaoning | And 2 more authors.
Metalurgija | Year: 2016

The electromagnetic feeding method was used to improve solidification quality of steel ingot, and the feeding principle of electromagnetic riser was introduced. The distribution characteristics of magnetic field in electromagnetic riser were investigated before and after pouring steel by the measures of numerical and physical simulation. The results showed that there’s a good symmetry of magnetic field distribution in electromagnetic feeding riser before pouring steel, but both symmetry and uniformity of magnetic field distribution are broken after pouring steel into riser, and magnetic induction intensity of the surface is higher than that of the inner of feeding riser. © 2016, Faculty of Metallurgy. All Rights Reserved.


Zhuang C.,University of Science and Technology Beijing | Liu J.,University of Science and Technology Beijing | Mi Z.,University of Science and Technology Beijing | Jiang H.,University of Science and Technology Beijing | And 2 more authors.
Steel Research International | Year: 2014

Twinning induced plasticity (TWIP) steels with excellent strength and elongation properties are expected to be the next generation of automotive high-strength steels. The present work investigates endogenous inclusions formed in Fe-25Mn-3Si-3Al TWIP steels in laboratorial ingot, mold casting after AOD steelmaking and electroslag remelting (ESR) process at industrial plant, respectively. The research shows that AlN and Al2O3 inclusions are found as dominating inclusions, and most of them are AlN, but the number, distribution, size shape of inclusions have big differences in different metallurgical processes. The AlN inclusions in laboratorial ingot mainly present cluster states and have larger size, but after AOD or ESR process most of AlN inclusions are uniformly distributed, this would reduce harm to steel quality. From the point of view of thermodynamics, the research finds that the generation of AlN inclusions in Fe-25Mn-3Si-3Al steels is different from that of most of other high-Al steels or Al-killed steels, because many publications reported that the precipitation of AlN inclusions took place at solidifying front or solid phase, but AlN inclusions formed in Fe-25Mn-3Si-3Al steels generate in liquid steel, and related experimental results prove this point. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Liu J.-H.,University of Science and Technology Beijing | Wang G.-X.,Zhongyuan Special Steel Co Ltd | Bao Y.-P.,University of Science and Technology Beijing | Yang Y.,University of Science and Technology Beijing | And 2 more authors.
Journal of Iron and Steel Research International | Year: 2012

Inclusion variations of die steel H13, including changes of species, morphologies, compositions, amounts and sizes, in the production of EAF→LF→VD→ingot casting→electro-slag refining (ESR) procedure, were investigated by systematic sampling, and analyzed with scanning electron microscope (SEM), energy dispersive spectrum (EDS), and metallographic microscope. The variation mechanism was studied by comprehensive analysis of total oxygen, nitrogen, and acid soluble aluminum as well as chemical test of refining slag. Based on the investigations, technical measures for cleanness improvement were discussed. The results show that oxide inclusions in H13 steel change from irregular Al2O3→near globular CaO-MgO-Al2O3 and CaO-Al2O3-SiO2 complex inclusions→finer CaO-Al2O3-SiO2 inclusions with higher CaO content→CaO-Al2O3-SiO2 inclusions with higher Al2O3 content and irregular MgO-Al2O3 inclusions→fine irregular MgO-Al2O3-CaS inclusions in various steps of the production; the variations are related with changes of acid soluble aluminum content, reactions between slag and steel, re-oxidation of liquid steel during casting, and refining of ESR. It is also found that A12O3 inclusions are modified by refining slag in LF and VD refining; and ESR plays a good role in inclusion removal, especially in controlling the large linear VC-CrC-MoC inclusions distributed in grain boundaries. It is suggested that casting protection should be improved, and the basicity of refining slag and acid soluble aluminum content in steel should be raised. © 2012 Central Iron and Steel Research Institute.


Yuan C.,Jiyuan Vocational and Technical College | Yang Y.,Jiyuan Vocational and Technical College | Chen L.,Zhongyuan Special Steel Co.
Applied Mechanics and Materials | Year: 2013

In view of the current LCA software, electromechanical products green design and green technology system are lacks of good support issues. From the electromechanical product manufacturing, process's technology characteristics, process parameters and green characteristic starting, to establish the overall technology system flow, system structure and system function model, and then from the view of electromechanical product life cycle green information integration, to analyze product BOM structure and green information integration strategy. According to the relationship between macining process parameters and process output indicators factors, to set up electromechanical products' process parameter model and the quantification method under LCA, using GBP algorithm selects optimization program, to achieve green manufacturing process. From the point of integration in-depth analysis, the analysis of the relationship between system functions and multiple targets of process parameters, and further development of a prototype system. © (2013) Trans Tech Publications, Switzerland.


Zhang W.,Zhongyuan Special Steel Co. | Xu H.,Zhongyuan Special Steel Co. | Liu P.,Zhongyuan Special Steel Co. | Shen W.,Zhongyuan Special Steel Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2016

Quenching process for a conical roller using 50 Hz/250 Hz dual frequency induction hardening machine was introduced. During quenching process, the space between the roller and the inductor is changed contiously that result in the magnetic flux efficiency continuously changed, so applied power should be adjusted linearly with roller stroke, thus the quenching temperature of the roller can reach uniform. After detected and used, the hardness and hardened layer depth of the roller meet technical requirements, which show the double frequency quenching technology can accomplish quenching of conical roller. © 2016, Editorial Office of "Jinshu Rechuli". All right reserved.


Zhou X.,Henan University of Science and Technology | Li H.,Henan University of Science and Technology | Yang C.,Huaneng Qinbei Power Generation Co. | Guo J.,Henan University of Science and Technology | Gao Q.,Zhongyuan Special Steel Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Hot compression tests were used to investigate the plastic deformation behavior of as-cast 42CrMo steel at elevated temperature. The tests were performed on Gleeble 1500D at strain rates ranged from 0.01 to 10 s-1, deformation temperature 1000-1150℃, and deformation 60%. The results show that the material flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate. The peak stress activation energy of the tested steel is 325.63 kJ/mol and the steady stress activation energy is 271.84 kJ/mol. Dynamic recrystallization takes place during the deformation process, and the average dynamically recrystallized grain size (Ddrx) increases with temperature and decreases with the increase of strain rate. The natural logarithm of Ddrx is linear with the natural logarithm of Zener-Hollomon parameter. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Du G.,Zhongyuan Special Steel Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

Rational post-forged heat treatment parameter for H13 steel was confirmed according to the service performance by analyzing phase transformation theory of H13 steel. Perfect spheroidizing annealed structure was obtained. And combining with the actual production situation of company, the most suitable post-forged heat treatment process was worked out. The production test demonstrates that the normalization+spheroidal annealing following new process is superior to others.


Liu J.-H.,University of Science and Technology Beijing | Zhuang C.-L.,University of Science and Technology Beijing | Cui X.-N.,Zhongyuan Special Steel Co. | Wang G.-X.,Zhongyuan Special Steel Co. | And 2 more authors.
Journal of Iron and Steel Research International | Year: 2014

Inclusion distribution in ingots was studied by dissection of a 16.8 t P12 ingot and a 5.0 t H13 ingot, with the analysis of T[O], original position statistic distribution analysis (OPA), metallographic microscope static analysis and small sample electrolysis. The results showed that the inclusions in ingots were uneven; a positive segregation area was found in the center and lower part of the ingot, while a negative segregation area was present in the central part of ingot top; inclusion segregation in a large size ingot was severer than that in a small one. A new concept, named inclusion segregation index, was put forward to quantify the segregation degree of inclusion. It was found that the segregation indexes drawn from T[O] analysis and OPA fit well, but they were different from those obtained by metallographic microscope static analysis and small sample electrolysis in the investigation of P12 ingot, which contained a higher sulfur content; while the segregation index drawn from T[O] analysis was close to that from metallographic microscope static analysis in the H13 ingot with a lower sulfur content. © 2014 Central Iron and Steel Research Institute.

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