Bai J.,Shenyang Aerospace University |
Wang J.,Anshan Iron and Steel Group Corporation
Advanced Materials Research | Year: 2011
in this paper, roll wear calculation model is developed considered the length of rolled strip, load distribution between rolls, roll surface roughness and other factors, and the corresponding calculation procedure has been developed. The experimental results show that the calculation value of the program is close to the actual data, and its accuracy can meet the requirement of on-line shape control. Based on the procedure, wear of each roll is calculated to study the effects of asymmetric bending. It is shown that asymmetric bending can decrease the local severe wear of rolls, and improve the uniform degree of roll wear distribution, thus the effects of asymmetric bending force on intermediate roll is better than that on work roll. Therefore asymmetric bending of intermediate roll can be used to reduce the wear of rolls in production. © (2011) Trans Tech Publications.
Shao A.,Anshan Iron and Steel Group Corporation
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013
For the mixed minerals which were prepared by pure martite, siderite and quartz, the iron grade, yield and recovery decrease rapidly with the increase of siderite content in iron ore, which indicates that the reverse flotation couldn't concentrate the carbonates-containing hematite ore. Stepped flotation was proposed which separates siderite first and then takes martite apart from quartz. Therefore, the mass fraction of the iron grade increases from 42.34% to 59.09% and iron recovery increases from 53.18% to 79.84% compared with routine reverse flotation. And for Donganshan carbonates-containing hematite ore, the mass fraction of iron grade of 66.34% and recovery of 71.6% are obtained in close-circle experiment of stepped flotation.
Zhang Y.-F.,Anshan Iron and Steel Group Corporation
Yejin Fenxi/Metallurgical Analysis | Year: 2016
The discharge behavior of light source in spark source atomic emission spectrometry was very complicated and it was difficult to observe directly. In order to study the emission behavior of atoms in single spark discharge, the time-resolved function and single spark treatment technique of spark source atomic emission spectrometer were utilized to design the experiments. The chronological sequence curves of light intensity in single spark discharge were obtained for atoms of seven elements in certified reference materials of stainless steel, including iron, aluminum, silicon, manganese, phosphorus, sulfur and carbon. The characteristics of chronological curves between single spark intensity and time were analyzed for each testing element. It was found that the emission behavior of atom in single spark excitation was behind the discharge behavior. The duration of chronological curve of single spark under same excitation condition and the time of maximum intensity of atoms were different for various elements. It provided a new route to decrease the detection limit, improve the sensitivity of spark source atomic emission spectrometer and avoid the spectral interference among elements. Moreover, it also provided a new way to further study the behavior of microscopic particles in spark discharge process. © 2016, Central Iron and Steel Research Institute. All right reserved.
Zhang X.-G.,Anshan Iron and Steel Group Corporation
Kang T'ieh/Iron and Steel (Peking) | Year: 2011
The latest developments in processes for producing high strength low alloy (HSLA) steels were introduced from clean steel production process, endless rolling process of thin slab continuous casting and rolling, strip cast rolling process and TMCP process based on fast cooling technology. The progress on many kinds of HSLA steel products was systematically described, such as automobile steels, steels for shipbuilding and offshore engineering, pipeline steels, steels for building structure, steels for nuclear power applications, steels for pressure vessels, steels for engineering machinery and steels for containers. Finally, the development trend of HSLA steels was predicted to be higher strength, higher performance and lower manufacturing cost in the future, which would be guidance for the development of HSLA steels in some way.
Shao A.L.,Anshan Iron and Steel Group Corporation
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016
A new soil amendment was prepared in this study, which was comprised of iron tailings (65%), active slag (20%), acid fertilizer (12%) and other additives (3%). Through comprehensive utilization, the iron tailings can be reused. The pH, salinity, density, porosity and permeability velocity of the soil from the test fields were detected. The results showed that the pH value of the soil decreased from 9.30 to 6.95, and the salinity decreased from 0.42% to 0.25% in one year. The density of the soil was lower by 7.80% than before improvement, while porosity and permeability velocity were higher by 9.35% and 72.73%, respectively. The new soil amendment could effectively resolve the problems of soil secondary salinization and re-alkali. The improvement of the saline-sodic soil by using this soil amendment has not only ecological, environmental and social benefits, but also economic benefits. © 2016 Taylor & Francis Group, London.
Liu D.-J.,Anshan Iron and Steel Group Corporation
Kang T'ieh/Iron and Steel | Year: 2016
On the basis of scientific analysis for the current quality of Ansteel coke, the influences of coke strength, thermal state performance, chemical composition, particle size and quality fluctuation on blast furnace smelting were studied. Through sampling the coke in the blast furnace tuyere and further validation with experiment, the blast furnace operation practice could be guided well, at the same time good results were achieved. The study made the blast furnace operator and coking plant personnel in Ansteel access to knowledge related to coke quality, the influence of coke quality on blast furnace smelting, and the coke quality evaluation methods and so on, especially the use of "tuyere sampling" for which it needs to know the change rule of coke in the furnace hearth working condition. The study provides a powerful technical support for the blast furnace operation, at the same time provides the basis for coking plant about how to implement low cost to meet the requirements of the blast furnace operation coke. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.
Gao Y.,University Of Science And Technology Liaoning |
Gao Y.,Anshan Iron and Steel Group Corporation |
Tahmasebi A.,University Of Science And Technology Liaoning |
Dou J.,University Of Science And Technology Liaoning |
And 2 more authors.
Bioresource Technology | Year: 2016
Oxy-fuel combustion of solid fuels is seen as one of the key technologies for carbon capture to reduce greenhouse gas emissions. The combustion characteristics of lignite coal, Chlorella vulgaris microalgae, and their blends under O2/N2 and O2/CO2 conditions were studied using a Thermogravimetric Analyzer-Mass Spectroscopy (TG-MS). During co-combustion of blends, three distinct peaks were observed and were attributed to C. vulgaris volatiles combustion, combustion of lignite, and combustion of microalgae char. Activation energy during combustion was calculated using iso-conventional method. Increasing the microalgae content in the blend resulted in an increase in activation energy for the blends combustion. The emissions of S- and N-species during blend fuel combustion were also investigated. The addition of microalgae to lignite during air combustion resulted in lower CO2, CO, and NO2 yields but enhanced NO, COS, and SO2 formation. During oxy-fuel co-combustion, the addition of microalgae to lignite enhanced the formation of gaseous species. © 2016 Elsevier Ltd.
Devereaux P.J.,Population Health Research Institute |
Xavier D.,St Johns Research Institute |
Pogue J.,Population Health Research Institute |
Guyatt G.,McMaster University |
And 11 more authors.
Annals of Internal Medicine | Year: 2011
Background: Each year, millions of patients worldwide have a perioperative myocardial infarction (MI) after noncardiac surgery.Objective: To examine the characteristics and short-term outcome of perioperative MI.Design: Cohort study. (ClinicalTrials.gov registration number: NCT00182039)etting: 190 centers in 23 countries.Patients: 8351 patients included in the POISE (PeriOperative ISch-emic Evaluation) trial.Measurements: Four cardiac biomarker or enzyme assays were measured within 3 days of surgery. The definition of perioperative MI included either autopsy findings of acute MI or an elevated level of a cardiac biomarker or enzyme and at least 1 of the following defining features: ischemic symptoms, development of pathologic Q waves, ischemic changes on electrocardiography, coronary artery intervention, or cardiac imaging evidence of MI.Results: Within 30 days of random assignment, 415 patients (5.0%) had a perioperative MI. Most MIs (74.1%) occurred within48 hours of surgery; 65.3% of patients did not experience ischemic symptoms. The 30-day mortality rate was 11.6% (48 of 415 patients) among patients who had a perioperative MI and 2.2% (178 of 7936 patients) among those who did not (P < 0.001). Among patients with a perioperative MI, mortality rates were elevated and similar between those with (9.7%; adjusted odds ratio, 4.76 [95% CI, 2.68 to 8.43]) and without (12.5%; adjusted odds ratio, 4.00 [CI, 2.65 to 6.06]) ischemic symptoms.Limitation: Cardiac markers were measured only until day 3 after surgery, and additional asymptomatic MIs may have been missed.Conclusion: Most patients with a perioperative MI will not experience ischemic symptoms. Data suggest that routine monitoring of troponin levels in at-risk patients is needed after surgery to detect most MIs, which have an equally poor prognosis regardless of whether they are symptomatic or asymptomatic. Primary Funding Source: Canadian Institutes of Health Research. © 2011 American College of Physicians.
Sha Q.,Anshan Iron and Steel Group Corporation |
Li D.,Anshan Iron and Steel Group Corporation
Materials Science and Engineering A | Year: 2013
A low carbon X80 pipeline steel with reduced Mn content has been thermomechanically processed. The microstructure, mechanical properties and susceptibility of the steel to hydrogen induced cracking (HIC) were studied. Yield strength levels up to 595. MPa, tensile strength levels up to 721. MPa and toughness levels up to 100% of shear area at -15. °C for drop wear tear test (DWTT) were achieved while no HIC crack was observed. The microstructure predominantly consisted of acicular ferrite (AF) together with small amount of granular bainite (GB) and martensite/austenite (M/A) constituent. The microstructure also contained high dislocation density and dislocation substructure. Precipitates of different morphologies and size ranges were observed and include cuboidal (70-100. nm), irregular (80-120. nm), spherical (30-70. nm) and fine precipitates (5-10. nm). The results indicate that the X80 steel with reduced Mn content is suitable for sour service application. © 2013 Elsevier B.V.
Ma G.-Y.,Northeastern University China |
Ma G.-Y.,Anshan Iron and Steel Group Corporation |
Cai J.-J.,Northeastern University China |
Zeng W.-W.,Northeastern University China |
Dong H.,Northeastern University China
Energy Procedia | Year: 2012
As energy crisis become increasingly prominent, the energy consumption has became the main problem which restricts the sustainable development of China's iron & steel industry. the recovery and utilization of different kinds of waste heat can effectively reduce energy consumption, the research of the scientifical recovery and utilization of waste heat become very important. The current situation and status of recovery and utilization of waste heat in the China's iron & steel industry will be analysed from some aspects such as the quality and the source process of waste heat, Based on them the potential and develop directions will be pointed out, combining with the analysis of the basic principle using energy scientifically, the mode of the recovery and utilization of waste heat is given, it is hoped that it can promote the scientifical and rapid development of recovery and utilization of waste heat of China's iron & steel industry. © 2011 Published by Elsevier Ltd.