Angang Steel Company Limited or Ansteel is a joint-stock limited company parented by Anshan Iron and Steel Group, which is supervised by State Council of the People's Republic of China. It is the second largest steel maker in Mainland China.Ansteel is engaged in producing and selling steel products as billets, cold rolled sheets, color coating plates, wire rods, thick plates and heavy rails. It was incorporated in 1997 when Anshan Iron and Steel injected its cold rolling, wire rod, and thick plate operations into Ansteel. Ansteel is headquartered in Anshan, Liaoning, China. Wikipedia.
Wu S.,Northeastern University China |
Cao G.,Northeastern University China |
Zhou X.,Northeastern University China |
Shi N.,Angang Steel |
Liu Z.,Northeastern University China
ISIJ International | Year: 2017
Recently, hot strip rolling processes are required to be agile and accurate in order to meet more and more diverse market demands. Under such circumstances, the traditional processing optimization by timeconsuming pilot experiments becomes difficult. To realize this target, core models of processing and mechanical properties are often established by neural network methods, which are used to handle nonlinear multi-variant systems. In modeling processing and mechanical properties, we found that the abnormal values in industrial big data could result in wrong predictions for the relationships between processing and properties. In the present work, therefore, data processing has been developed to prevent misleading predictions, which was performed by eliminating the redundant, abnormal, and imbalanced data before modeling. The Bayesian neural network was used to construct the modeling of mechanical properties for hot rolled C-Mn steels, which demonstrated that the accuracies between the measured and predicted values were within ±10% and ±5% for strength and elongation, respectively, providing a reliable model for the optimal process design. By applying the multi-objective optimization algorithm named Strength Pareto Evolutionary Algorithm 2 (SPEA2), the hot strip rolling processes for C-Mn steels were optimized in order for either stabilizing variations of properties or upgrading mechanical properties. Industrial trials were extensively carried out, showing good agreements with the optimized processes. © 2017 ISIJ.
Wei S.T.,Angang Steel |
Lv D.,Angang Steel |
Liu R.D.,Angang Steel |
Lin L.,Angang Steel |
And 3 more authors.
Science and Technology of Welding and Joining | Year: 2014
Similar and dissimilar combinations of a 1000 MPa galvanised dual phase (DP) steel and a 980 MPa transformation induced plasticity (TRIP) steel were resistance spot welded under different welding and heat treatment parameters. The microstructure and mechanical properties of spot welds were evaluated using metallographic technique, microhardness and tensile shear tests. The results showed that the tendency to fail in the pullout mode increased in the order of DP/ DP, TRIP/TRIP and DP/TRIP welds, which was caused by the different hardness distribution, carbon equivalent and susceptibility to shrinkage void formation of spot welds for different combinations. In the study of the effects of heat treatments on the DP/TRIP welds, the pre-heating procedure improved the splash of welding to some extent. When the cooling time was larger than or equal to 1000 ms, the post-heating procedure improved the mechanical properties of spot welds owing to the temper of spot weld microstructure. © 2014 Institute of Materials, Minerals and Mining.
Ding F.,LIAONING Technical University |
Wang X.,Angang Steel
Advanced Materials Research | Year: 2011
A numerical model is developed to describe the kinetics of the microstructure evolution in an atomized droplet of Mg-9wt%Al alloy. The model is coupled with the heat transfer controlling equations to simulate the solidification process of the atomized droplets. The numerical results show that the microstructure development is a result of the common action of the nucleation and growth of grains. The nucleation events take place at a critical supercooling for a given droplet. As the droplet size decreases, the critical supercooling increases significantly. The volume fractions of the phases formed during the period of the recalescence, the segregated solidification and the eutectic reaction are sensitive to the droplet size. It is demonstrated that the developed model describes the microstructure evolution process well.
Zhao B.,Angang Steel |
Zhao T.,Angang Steel |
Li G.,Angang Steel |
Lu Q.,Angang Steel
Materials Science and Engineering A | Year: 2014
Single-pass compression tests were performed on a Gleeble-3800 thermo-mechanical simulator to study the dynamic recrystallization behavior of a low carbon vanadium-nitride microalloyed steel at the temperature in the range from 900°C to 1050°C and strain rate in the range from 0.1s-1 to 10s-1. Based on the flow curves from the tests, the effects of temperature and strain rate on the dynamic recrystallization behavior were analyzed. With the assistance of the process parameters, constitutive equations were used to obtain the activation energy and hot working equation. The strain hardening rate versus stress curves were used to determine the critical stress (strain) or the peak stress (strain). The dependence of the characteristic values on Zener-Hollomon was found. The dynamic recrystallization kinetics model of the tested steel was constructed and the validity was confirmed based on the experimental results. © 2014 Elsevier B.V.
Sha Q.-Y.,Angang Steel |
Li D.-H.,Angang Steel |
Li G.-Y.,Angang Steel
Journal of Iron and Steel Research International | Year: 2014
The dynamic recrystallization (DRX) and static recrystallization (SRX) behaviour of coarse-grained austenite in a Nb-V-Ti microalloyed steel were studied by using a Gleeble thermomechanical simulator. Continuous and interrupted compression tests of coarse-grained austenite were performed in the temperature range of 1000-1150 °C at a strain rate of 0.1-5 s-1 The peak and critical strains for the onset of DRX were identified with strain hardening rate analysis, and the ratio of critical strain to peak strain was found to be consistent with the one reported for finegrained austenite. An equation of the time for 50% softening was proposed by considering the activation energy of steel without microalloying elements and the solute drag effect of microalloying elements. Strain-induced precipitation may not take place at the deformation temperature above 1000 °C, which indicates that SRX of coarse-grained austenite is mainly retarded by coarse grain size and Nb in solution during rough rolling. © 2014 Central Iron and Steel Research Institute.
Sha Q.Y.,University of Science and Technology Beijing |
Sha Q.Y.,Angang Steel |
Sun Z.Q.,University of Science and Technology Beijing
Ironmaking and Steelmaking | Year: 2010
The solidification structure, austenite and precipitates in a quenched compact strip processing (CSP) medium thin slab (170 mm thick) of Nb-V-Ti microalloyed steel have been studied. It was found that secondary dendrite arm spacing and austenite grain size are slightly larger than that of similar steel produced by CSP thin slab. This is partially attributed to the slower cooling rate caused by the increased slab thickness. On the other hand, the formation of carbonitride during solidification reduces the width of secondary dendrite arm spacing, while TiN particles and alloying elements in solution may inhibit the growth of austenite grain during solidification and subsequent cooling. In addition to the semidendritic, larger cubic and fine cubic precipitates, which can be observed in CSP thin slab, dendritic precipitates were also found in CSP medium thin slab. © 2010 Maney Publishing.
Wei S.,Angang Steel |
Wei S.,CAS Shenyang Institute of Metal Research |
Lu S.,CAS Shenyang Institute of Metal Research
Materials and Design | Year: 2012
A low carbon microalloyed S355 steel weld metal with and without Nb addition was subjected to normalizing process for different times and the microstructure as well as mechanical properties of the weld metal were evaluated and analyzed. The results showed that there were great differences between the microstructure and mechanical properties of the as-welded and the as-normalized weld metal, and the number of normalizing times played an important role on the microstructure and properties of the Nb bearing weld metal. The strength and plasticity of the as-welded weld metal were improved with the addition of Nb element, while the impact toughness was not affected significantly with the Nb addition. The normalizing treatment at 900 °C converted the columnar grain microstructure (CGZ) of weld metal in the as-welded state to an equiaxed grain structure, and the NbC precipitates were observed in the CGZ of the Nb bearing weld metal. The as-normalized weld metal had lower yield and tensile strength, higher elongation and impact energy than the as-welded weld metal. Different normalizing times were performed in order to study the effect of subsequent normalizing on the mechanical properties of the weld metal. With increase of the normalizing times at the normalizing temperature of 900 °C for 3. h, the size of NbC precipitates in the Nb bearing weld metal increased significantly, while the strength, elongation and impact energy first increased and then decreased. After three normalizing treatments, the optimal microstructure, strength, plasticity and toughness of the weld metal were obtained. After six normalizing processes, a duplex grain structure appeared, which deteriorated the properties of the Nb bearing weld metal. However, for the Nb free weld metal, the microstructure and mechanical properties did not change significantly with increasing normalizing times. © 2011 Elsevier Ltd.
Li H.,CAS Institute of Process Engineering |
Cao H.,CAS Institute of Process Engineering |
Li Y.,CAS Institute of Process Engineering |
Zhang Y.,CAS Institute of Process Engineering |
Liu H.,Angang Steel
Environmental Engineering Science | Year: 2010
Coking wastewater was treated by an A-O1-O2 biofilm system composed of an anoxic bioreactor and two aerobic ones. To improve removal efficiency of organic pollutants, the anoxic bioreactor was used to investigate organic removal via anoxic process with enhanced denitrification, and the first aerobic bioreactor was used to test the feasibility of nitrogen removal via nitrite in an attached growth system. Concentrations of ammonium nitrogen(NH+ 4-N), phenols, and chemical oxygen demand (COD) in the wastewater ranged between 200 and 500, 250 and 350, and 1,700 and 2,200mg L-1, respectively. Removal of organic pollutants through anoxic process was enhanced by raising ratio in the influent of anoxic bioreactor. Removal efficiencies for total organic compounds of 17.84%, 41.78%, 82.63%, and 88.73% were obtained at ratios of 1:10, 1:5, 1:3, and 1:2, respectively. Shortcut nitrification was obtained in the first aerobic bioreactor when dissolved oxygen was 2.0-3.0L-1 at 35°C±1°C. Both ammonia oxidation ratio and nitrite accumulation ratio were maintained above 85%, with ammonia load ranging from 0.22 to 0.30g (L day)-1 by adjusting the hydraulic retention time and influent concentration. Gas chromatography/mass spectrometry analysis demonstrated that most of organic compounds were decomposed at the enhanced denitrification stage and the high removal efficiency of total organic compounds was obtained through the A-O1-O2 process. This study was presumed to provide a better option for the treatment of coking wastewater. © Mary Ann Liebert, Inc.
Deng J.-H.,Angang Steel
Yejin Fenxi/Metallurgical Analysis | Year: 2013
The basic knowledge and related books of glow discharge optical emission spectrometry technology were briefly introduced. Its application in domestic steel industry was reviewed in detail. The bulk analysis of domestic steel industry was involved in middle-low alloy steel, stainless steel, pig iron, cast iron and high temperature alloy. The anode diameter was main 4 mm. The analytical elements were up to 24 kinds. The excitation power was 12-90 W. The data precision was mostly less than 5%. The depth profile analysis was mainly involved in galvanized sheet, tinning sheet and color-coated sheet. The determination of fluorine and preparation of scanning electron microscopy samples were bright spots of its application. The progress of international standard and national standard of glow discharge optical emission spectrometry was summarized. The repeatability and reproducibility of glow discharge optical emission spectrometry, X-ray fluorescence spectrometry, inductively coupled plasma atomic emission spectrometry and spark source atomic emission spectrometry in the determination of multi-elements in middle-low alloy steel were compared. The data indicated that the repeatability of glow discharge optical emission spectrometry was low, while the reproducibility was high. Finally, the factors limiting the development of glow discharge optical emission spectrometry were discussed.
Angang Steel | Date: 2014-12-24
A method for preparing low-cost clean steel includes steps of: preliminarily desulfurizing iron melt: preliminarily desulfurizing in an iron melt channel during blast furnace tapping and during iron folding in an iron folding room, adding a desulfurizing ball into the iron melt during the blast furnace tapping or the iron folding; dephosphorizing and controlling sulfur: dephosphorizing and controlling sulfur during converter steelmaking, in such a manner that P 0.014% and S 0.004% during tapping; rapidly dephosphorizing by slag-forming: rapidly dephosphorizing by slag-forming during converter tapping, at a converter end point, controlling a C content at 0.020.10%, adding a dephosphorizing ball through an alloy chute during the converter tapping, blowing argon and stirring at the same time; purifying steel melt during RH refining: adding a purifying ball at a late stage of the RH refining when a vacuum degree is at 66.7500Pa; and continuously casting with whole-process protection. According to the present invention, steel quality is effectively improved while cost is lowered. Compared with the conventional process, raw materials utilized in the method are cheap, the cost per ton of steel is reduced by5-10 Yuan.