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2009 Vol. 44 No. 10
Published: 2009-10-15
综合论述
1
Recent Technology Development of Grain Oriented Electrical Steel
Recent research and technology development of grain oriented electrical steel and non-oriented electrical steel in the world were summarized，considering energy and environmental requirements．And new process such as thin slab casting rolling and twin roll casting technology were introduced．
2009 Vol. 44 (10): 1-1 [
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原料与炼铁
6
Effect of Magnesia addition on Sinter Reducibility
In this paper, the influence of MgO on sinter reducibility has been studied and analyzed through determining the reduction rate of sinter at different temperature and chemical composition via thermogravimetric analysis combining microstrcture of sinter. The study has shown that MgO has different rules on sinter reducibility at 850℃ and 1220℃, i.e.,it promotes reducibility of sinter at 850℃ and restrains sinter reduction at 1220℃. At the meanwhile, the effects of SiO2 and basicity on reducibility are effected by MgO, i.e., enhancement of basicity is inclined to reducibility, and the enhancing SiO2 content has adeverse effect on sinter reducibility, but both of which are weakend with the addition of MgO and Al2O3. Keywords: calcium ferrite MgO reducibility
2009 Vol. 44 (10): 6-6 [
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10
ZHANG Dai-lin YU Liang ZHeng Ming-dong
Study on factors of Influencing on coke thermal property
In present work, 13 experimental coal blends with similar caking property were tested by 70kg small coke oven test. Compared with the relationship between coke thermal property and mineral catalysis index, coal maceral and coke optical texture ,it was found that coke thermal property depends mainly on mineral catalysis index (MCI)in the ash when the coal blends have similar caking property; the content of coal macerals has an impact on coke thermal property; the influence of optical anisotropy index(OTI) and optical texture value as well as coke reactivity(CRI) on coke post-reaction strength (CSR) can be observed. The conclusion has important practical significance to guide coal blending production, stabilize and improve coke thermal property.
2009 Vol. 44 (10): 10-10 [
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14
LIJin Lian
Effect of additives on Reduction Swelling of Iron ore pellets
The reduction swelling of iron ore pellet is one of an important evaluation of the metallurgical properties . Because of the large-scale blast furnace, the request on pellets are constantly increasing , To get lower reduction swelling and quality of pellets is one of the pursuit of metallurgy workers. In this paper, under the present raw materials conditions of AnSteel, Adding additives containing CaO and / or MgO flux to the iron ore, and stduy on effect additives on Reduction Swelling of Iron Ore Pellets. From the results obtained, CaO deteriorated the reduction swelling of iron ore pellet, the swelling of iron ore pellet is controlled by adding additives containing MgO,With the flux in content increasing , the reduction swelling of iron ore pellet is lower.
2009 Vol. 44 (10): 14-14 [
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ZHeng Ming-dong
A Modeling Research of Mineral- Catalysis-Index for Coke Reactivity upon the Degree of Catalysis
Abstract: The mineral composition as Na2O, CaO, MgO, SiO2, Al2O3 et al affected on coke thermal properties. The catalysis behavior of main mineral composition on reactivity of coke was researched. The mathematic model of Mineral- Catalysis-Index upon the Degree of Catalysis was discussed. Several Catalysis Index models were compared and the adaptability on prediction quality of metallurgic coke was also researched. The results took an important rule on predicting the thermal property of coke.
2009 Vol. 44 (10): 17-17 [
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炼钢
21
Feng Wen-xiang
Water Model Study on Inclusion Removal in Tundish with Argon Bubbling
The effects of inclusion removal in tundish with argon bubbling were investigated by choosing aniline simulated as inclusions and silicone oil as slag in a water model. And RTD curves had been measured by means of “irritating-response method”. The process and mechanics of inclusions removal were researched. The results show that in gas bubbling tundish, the ratio of inclusion removal may not be at maximum with the biggest proportion of piston volume. When gas purging at the injection flow area, the probability of bubble capturing inclusion may be increased and the collision between inclusions may be promoted. These all will accelerate the inclusions rising and being removed.
2009 Vol. 44 (10): 21-21 [
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GENG Dian-Qiao Ji-Cheng HE
Effect of Different Technological Factors on Inclusion Removal in RH Degasser
The numerical method was employed to study the effect of technological factors on the inclusion removal in RH degasser. The numerical results indicated that for small inclusion, the number density can be decreased effectively by collision growth. For big inclusion, the number density can be decreased by Stokes floatation. The inserting depth of the snorkels, the vacuum chamber pressure and the gas flow rate are three key parameters of inclusion removal and the gas flow rate is the most important one. The inclusion removal rate is up 6 percent while the inserting depth of the snorkels decreases from 800mm to 300mm. The inclusion removal rate is up 12 percent while the vacuum chamber pressure decreases from 5.0kPa to 1.0kPa. The inclusion removal rate can reach 75 percent while the gas flow rate is up to 2000NL. Inclusions larger than 20μm can be removed after RH treatment if gas flow rate is up to 1275NL, but it can not promote the removal rate of inclusions greater than 10μm effectively if the gas flow rate is greater than 1750NL.
2009 Vol. 44 (10): 26-26 [
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31
ZHU Zheng-Hai PENG Shi-Heng
Experimental Study on Inclusion Removing Efficiency of CSP Tundish
Appropriate measures must be taken to strictly control inclusion content in the molten steel during the product process of electric steel because the inclusion in final steel product can remarkably influence on its properties especially for electric steel which has strictly requirements for the purity of molten steel. In this paper the authors investigate the category, content and granularity distribution of inclusion in continuous casting tundish when CSP was used to produce electric steel in Ma Steel. Then analyse and evaluate the inclusion removing capability of CC tundish. The results by test show that the CC tundish after rebuilding and optimization can almost remove inclusion larger than 40m in liquid steel, and provide assembling and growing kinetic condition for inclusion less than 30m. The tundish has powerful capability of inclusion removing, which guarantees that high-quality electric steel can be produced.
2009 Vol. 44 (10): 31-31 [
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36
ZHANG Xing-wu Ji-Cheng HE
Experiment Study of Magnetic Field Distribution in the Intermediate Frequency Soft-Contact Electromagnetic Continuous Casting Mold for Round Billets
In order to study the distribution of the magnetic field of the mold of intermediate frequency soft-contact electromagnetic continuous casting, measured the distribution of magnetic induction intensity of mold under different electrical parameters and different process parameters through the experimental method, the results showed that: the magnetic induction intensity of mold increased with the increasing of power and current intensity of the coils; under the same power, with the increasing of the frequency of power, the magnetic induction intensity of mold was reduced after the first increase, and under the same current intensity, with the increasing of the frequency of power, the magnetic induction intensity of mold was increased; in this experiment, when the frequency was 2500Hz, the largest magnetic induction intensity was obtained under the same power; with the fall of height of the free surface, the magnetic induction intensity was reduced after the first increase, and when the free surface was located in the center of height of the coils, magnetic induction intensity reached maximum.
2009 Vol. 44 (10): 36-36 [
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压力加工
41
Wang Ying-Rui
Plate Transient Temperature Field Precise Calculation in the Finish Rolling Process of Hot Tandem Rolling
Based on the different fashions of the cooling, the finish rolling area is divided into two parts, the rolling area and the no-rolling area, and with the finite difference method, the precise plate temperature field model is established. For analysis and calculation, the rolling area is mapped into the rectangle, and then the precise boundary conditions are built to calculate three dimensional temperature field of plate. In the no-rolling area, main factors are taken into account, such as the descaling, the water cooling and the air cooling and so on, to calculate two dimensional transient temperature of plate in the longitudinal direction. The results of the experiment and the simulation indicate that the model has higher computational accuracy, and accord with the actual engineering.
2009 Vol. 44 (10): 41-41 [
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PAN Liang-Ming Ming-xi Mao
The Influence of Protective Atmosphere and Structural Properties on Steel Strip Cooling Characteristics in Continuous Annealing Furnace
The requirement to the high-quality cold-rolled sheet production process is very high. Therefore the easy controlled rapid stable cooling rate has become an important way to enhance the quality of steel robin. In present paper, the unsteady standard k-ε turbulence model was adopted to simulate the continuous annealing furnace steel cooling process, the simulation agrees the experimental results very well. The investigation found that the temperature uniformity and cooling rate are optimized when the hydrogen concentration is 30%; controlling cooling rate can be realized by controlling the initial temperature, bellows-strip spacing and jet rate of the cooling gas.
2009 Vol. 44 (10): 46-46 [
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51
liu jia-wei
Overlapping degree Calculation Model for Flatness Measurement
In flatness measurement system, at the edge of shape meter sensor has the direct relation between forced condition and the coverage fraction size. In order to obtain the accurate shape of strip measurement value, the strip measurement theory of the BFI shape meter and it’s sensor at tension condition are analyzed .The overlapping degree mathematical expression is inferred. This model used in the BFI strip shape measurement system is applied in practice. It’s realized the precise shape of strip control
2009 Vol. 44 (10): 51-51 [
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Design of Backup Roll Profile with Genetic Algorithm to Improve strip Flatness in MeiSteel
In order to resolve the flatness problems of extreme size strip in MeiSteel 1422 tandem hot mill after the enlargement of sizes and steel grades, the initial profile of hot mill backup roll were researched, and the functional design principles of new backup roll profile optimization were proposed; on the basis of these design principles, the genetic algorithm backup roll profile design platform was established which used two-dimension FEM with variable thickness to calculate roll system deformation, the automatic optimization of roll profile curve was realized, and the design method of hot mill backup roll initial profile was perfected; according to simulation verified the improvement effect of new profile on aspect of flatness control efficiency, and applied to the production, practice results shows that the new backup roll profile has obviously improved the flatness of extreme size strip at the unit exit, at the same time the wearing of backup and work roll has large improvement.
2009 Vol. 44 (10): 57-57 [
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钢铁材料
61
Song Zhi-gang
Research on dynamic softening mechanism of 00Cr22Ni5Mo3N during hot distortion
Through plane strain compression ,the effect of distortion temperature on the hot ductility of 00Cr22Ni5Mo3N is studied ,and the dynamic softening mechanism of 00Cr22Ni5Mo3N duplex phases during hot distortion is investigated .The results show that the distortion temperature can markedly influence the peak stress of 00Cr22Ni5Mo3N specimens .And ferrite can be softened through dynamic restoration and recrystallization ，but austenite can be softened only through dynamic restoration during hot distortion .
2009 Vol. 44 (10): 61-61 [
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66
Study on Increasing Pre-finishing Temperature of GCr15 Bearing Steel Wire
Few network carbides and fine laminar pearlite were obtained in the industrial experiment on increasing the pre-finishing temperature of GCr15 bearing steel φ10mm wire, and heat simulation method was used in laboratory to analyze industrial experiment phenomena further. It was found that cementite particles are uniform and fine, network level decreases to 1.5, Brinell hardness is 202.72, and strength and toughness are both high in annealed tested steel, the time of network carbides precipitate is the moment of ultra-fast cooling, when the pre-finishing temperature is 944℃, and they all satisfy demands for GB/T18254-2002 and practical production to annealed GCr15 bearing steel.
2009 Vol. 44 (10): 66-66 [
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71
Ming-Xin CHEN
Technology and Principle Low Temperature Secondary Hardening of Organic Matter Cutting Tool Steel
The technical principle of reaching ultra-hardness by secondary hardening at low temperature for organic matter cutting tool steel 9CrV has been studied in detail. Special heat treatment was used to precipitate numerous and fine alloy cementites directly in low temperature tempering, and then realize ultra-hardness via high-carbon matensitic hardening and precipitation strengthening of fine dispersed alloy cementites, the size of the cementites is refined to about 50nm and the hardness of the cutting tool steel reaches HRC 68 ~ 72.
2009 Vol. 44 (10): 71-71 [
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75
Xu Fengyun Bing-zhe BAI Hong-sheng FANG
Development of water-cooled bainitic steel used in hydraulic shelves pillar
Water-cooled bainitic steel used in hydraulic shelves pillar was developed to increase the hardenability of steels and trial production was carried out. The water-cooled bainitic steel developed with non-expensive alloy element shows excellent combination of strength and toughness, processing high-performance and can meet the need of hardenability of pillar with a diameter blow 300mm. Granualr bainite was obtained after Ф300 pillar quenched by water, and yield strength, tensile strength and toughness at -20 oC of Ф300 pillar are greater than 620 MPa, 850MPa, 65 J repectively.
2009 Vol. 44 (10): 75-75 [
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78
CHEN Chao
Condensate Corrosion Behavior of A New Style Ferritic Stainless Steel Used in Automotive Exhaust System
Cr plays a very important role in the corrosion resistance of ferritic stainless steels. The corrosion resistance of a series of ferritic stainless steels used in automotive exhaust system was evaluated by a condensate corrosion test. As a result, the condensate corrosion resistance of ferritic stainless steels contained more than 17% Cr was almost the same with the ones contained 17% Cr after ten periods of the condensate corrosion test. Moreover, the average corrosion lost weight was lower than 6g/m2 and the average maximum corrosion depth was less than 0.03mm for the two types of ferritic stainless steels. According to the test result, the new developed type 439M ferritic stainless steel and type 409L stainless steel were studied in the condensate corrosion test for 5 periods, 10 periods and 20 periods separately. The maximum pitting depths on the samples’ surface after various period corrosion tests were calculated by extreme value analysis to evaluate the maximum pitting depth of the whole muffler. The result indicates that the forecasted longevity of 439M ferritic stainless steel is 1.6 times of 409L stainless steel’s.
2009 Vol. 44 (10): 78-78 [
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82
An-wu LIU Chun-xu WANG Xian-min LIU Yong LI
Investigation on Hot Deformation Behavior of SAE 9310 Steel
The hot compression deformation behaviors of high strength carburized SAE9310 steel used for making transmission parts has been investigated by use of Gleeble-3500 simulator at the temperature rang of 1123K to 1423K, strain rate of 0.1-10s-1 and at the true strain of 0.8. The high temperature flow curves of SAE9310 steel have been determined and hot deformed microstructures were observed. The results show that the flow stress and peak strain increase with strain rate increasing or deformation temperature decreasing. At true strain 0.8, the temperature of full dynamic recrystallization increases with the strain rate rising. when the deformation temperature is above 1323K full dynamic recrystallization occurred at strain rate of 0.1-10s-1. The hot deformation activation energy Q of SAE9310 steel is 416.78kJ/mol and the hot deformation equation is derived based on the experiments.
2009 Vol. 44 (10): 82-82 [
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环保与能源
87
Wu Fu-zhong 吴复忠
Study on Reaction Mechanism of Flue Gas Desulfurization in Sintering with Pyrolusite
By the HCS Chemistry software, analyzed the reaction mechanism of FGD with pyrolusite, and make sure there are two process of desulfurization:①the main reaction as(MnO2+SO2=MnSO4),②the minor reaction (SO2+1/2O2+H2O=H2SO4). The minor reaction has much influence on the main. The results can give the evidence and feasibility of the technology process of FGD in sintering with pyrolusite.
2009 Vol. 44 (10): 87-87 [
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Experimental research of using CO2 to reduce dust in steelmaking
Through the experiment of application COMI converter steel-making process control dust, results showed that: increasing the proportion of CO2 injection, converter dust continued to lower core loss. And the research on converter dust collected on-site test showed: the overall amount of converter dust continue to trend lower in the process, TFe content had the larger fluctuation. Combination of the above-mentioned research, this paper proposed application of COMI steel-making process to control the generation of converter dust divided-period, which provides a reference for the industry implementation of the COMI steel-making process.
2009 Vol. 44 (10): 92-92 [
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技术交流
95
James Wu
Technique Study pf Reducing Longitudinal Surface Crack of Beam Blank
Studied the reason and the countermeasure of longitudinal surface crack of Ma-Steel beam blank. Because of the special shape, there were strong non-uniformity of heat transfer in the mould. there were strong variations in surface temperature of beam blank. So that, Thermal stress induce the crack. Heat transfer in the mould and the performance of casting powder were improved. the stabilization of casting conditions were enhanced. Finally, the ratio of crack defect have been decreased 80%.
2009 Vol. 44 (10): 95-95 [
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98
ZHAI Jun WU Wei
Study on Inclusions of 45A Caster
In order to determine the inclusions of 45A Caster ,in this paper ,with the help of metallographic observation、SEM and big sample electrolysis ,slab inclusion type, shape, dimension and distribution of arc caster have been studied .The results showed that：the whole control level of inclusion is well.The average of the amount of inclusions is 22.2mm-2,but in the middle of the caster inclusions is 25.8mm-2；With the help of big sample electrolysis，SEM，found that the total amount of inclusions of cast is 2.23mg/10kg，and inclusions is more than 300μm.Large inclusion come from mould fluxes、oxidation products、tundish covering flux and so on.
2009 Vol. 44 (10): 98-98 [
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