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2010 Vol. 45 No. 9
Published: 2010-09-15
综合论述
1
KANG Yong-Lin Yu-qing WENG
Recent Progress in Steel Rolling Technology in China
Resent progress in steel rolling technology in China was briefly introduced in present work, including: 1) Technology integration and development of production lines, such as Hot Wide Strip, Wide and Heavy Plate, Large-Scale Cold Continuous Rolling and Three Roll Continuous Pipe-rolling Mill, as well as the equipment modernization development of Thin Slab Casting and Rolling Line; 2) Progress in steel rolling technologies such as Semi-endless Rolling, Thin Strip Production, Long Length (100m) Rail Rolling and New Generation Controlled Cooling technology; 3) Research and application of microstructure-property control during the rolling process, and the development of production technology and steel grades including high performance and high strength strip, medium heavy plate, cold rolling strip, long products and tubes; 4) Development of energy-saving and emission-reduction technology, such as the non-oxidizing or low oxidizing heat equipment and technology.
2010 Vol. 45 (9): 1-1 [
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原料与炼铁
14
Study on Application of Mount Gibson during Sintering Process
A low quality ore called Mount Gibson was researched for using during sintering. Firstly, high temperature properties of ore were studied by micro sintering equipment, based on which, sinter pot tesr was carried out to verify the application of Mount Gibson. Results show that, the assimilation and liquid phase fluidity of Mount Gibson both are high, which can be used as a measure to make up the disadvantage of that ore with high SiO2 and Al2O3 content and bad size composition. At last, in industrial practice, usage of Mount Gibson with ratio of 6% was feasible in sintering and blast furnace.
2010 Vol. 45 (9): 14-14 [
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18
Study on Sintering Process Parameters Orthogonal test of Cheng Gang V-Ti Magnitite
Chengde Iron & Steel sintering production was mainly vanadium-titanium magnetite concentrate for the iron materials, But the finished sinter strength is low, RDI serious。To solve this problem, Study the impact of RDI and mechanical strength of sinter based on raw materials R, fuel ratio, MgO content and water by sintering Cup ,Reached conclusion that the best Sintering process parameters under the current conditions of the original fue is that R is 2.6; Fuel ratio is 4.5%; MgO is 4.0%;H2O is 7.5%.which provided theoretical basis to the actual production.
2010 Vol. 45 (9): 18-18 [
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The Study on the Sintering Property of High proportion Limonite with Ultra-fine Magnetite Concentrate
Sinter pot tests and metallurgical properties studies were performed based on the physical, chemical and thermal analysis of Yandi ore .The studies had shown that sintering material cost will decrease and quality sinter will be produced if set a reasonable proportion of Yandi ore with self-made Jianshan iron concentrate and adopt corresponding measures to perfect sinter bed permeability.
2010 Vol. 45 (9): 22-22 [
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炼钢
28
WANG Wenjun Jingang Liu Ning Hao Yongdong Li
Study on Inclusions Removal from Liquid Steel by Soft Bubbling
Industrial trials were carried out in 100t ladles in Shouqin steel plant to study the correlation between the soft bubbling and inclusions removal degree. The results showed that at the beginning of soft bubbling the T[O] in steel is about 16ppm and most inclusions are smaller than 20µm. The inclusions in liquid steel could be removed efficiently with a gas flow rate of 80-110L/min and a soft bubbling duration of more than 15min. Under this condition the inclusion cleanliness index was high, which stands for the inclusions amount in steel and can keep larger than 0.97. When the gas flow rate was over 120L/min or under 60L/min, the inclusion cleanliness index was low, which infers that the inclusions in steel were not removed efficiently.
2010 Vol. 45 (9): 28-28 [
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32
Wu YANG Pei ZHAO
Research on Heredity of Solidification Structure and Segregation of Spring Steel Billet Rolled
Solidification and composition segregation of billet are important factors which affect homogeneity of mechanical property of steel. In order to study heredity of solidification structure and segregation of spring steel billet rolled,the 60Si2Mn billets with different equiaxed grain rate and segregation degree are used as experiment object in this paper. The billets whose section size is 150mm×150mm has been rolled into two round bars whose diameter are 75mm and 25mm separately.The mechanical property at interior different position of rolled steel and segregation index of billets with different equiaxed grain rate have been measured. The result show that the carbon segregation index in off center area where the distance to billet core exceed 21.2 mm does not improved while equiaxed grain rate is increased.Porosity and light segregation existed within rolled steel and the inner mechanical property is poor relatively.Therefore central segregation and porosity of billet would inherit to rolled steel.The mechanical property and its uniformity of round bar whose diameter is 25mm is better than that of round bar whose diameter is 75mm.As a result,adding rolling reduction would lighten heredity effect of billet central segregation.
2010 Vol. 45 (9): 32-32 [
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36
Study on Neuron Control of Non-sinosoidal Oscillation System for Continuous Casting Mold
This paper introduces the Application of single neuron adaptive PID controller in non-sinusoidal oscillation system for continuous casting mold. The control performance comparing with the conventional PID controller was given. The simulation results show that single neuron adaptive PID controller can improve the responding rate and control precision of mold oscillation. The Target of mold negative strip time is ensured efficiently. The movement curve of the mold can be same as the defined non-sinosoidal oscillation curve.
2010 Vol. 45 (9): 36-36 [
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40
YU Guosong
LF Refining Slag Technics of Low Carbon Free Cutting Steel
Compared with reductive slag，free cutting steel LF refining slag possesses the unique metallurgical function of control of free oxygen content in molten steel , low rate of desulphurization and dephosphorization. With low basicity and proper quantity，the slag should contain proper ratio of FeO and MnO, and absorb A12O3 and silicate adequately. The proper refining slag contains 30-40%CaO,10-25%A12O3,2-6%FeO,10-25%MnO,10-20%SiO2,4-8%MgO.With this slag, the average desulphurization rate is 11.7%,( %p)/[%P] is 0.56，inclusion B ranges from 0 to 1, inclusion C is 0 to 1.5.
2010 Vol. 45 (9): 40-40 [
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44
Production Practice on the Reduction of Surface Faint-sliver defects in Cold-Rolled IF Steel
Abstract: Results showed that faint-sliver defects in cold-rolled steel sheet were caused by microcrack under the skin of strands, slag entrapment in mold during casting and inclusions in strands during rolling by analysis on cold-rolled plates, hot-rolled plates and strands in Panzhihua Steel. Faint-sliver defects were reduced effectively after the use of technical measures in mass production of IF steel, which were decreasing oxidation of ladle slag, controlling the ratio of CaO/Al2O3 in slag, extending circulation time of deoxidization and alloying in RH furnace, controlling the casting speed and increasing the viscosity of mold fluxes. Therefore, the ratio of decreasing the quality grade of strands reduced from 10.97% to 1.0%.
2010 Vol. 45 (9): 44-44 [
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48
YANG Yue-Biao
Development and Application of Dynamic Secondary Cooling Control Model in Continuous Casting
The on-line solidification and heat transfer model for continuous casting was established by tracking elements method. The concept of virtual slab life was proposed for the first time in the model, and it has realized the calculation of real-time temperature field in the casting strand. The dynamic secondary cooling control model based on the on-line solidification and heat transfer model for continuous casting has been developed via the control algorithm of adaptive setting PID together with classical anti-windup. The application shows that the control model has strong disturbance rejection ability, and secondary cooling water rate could be well controlled. Under the control of the model, the secondary cooling water changed smoothly under the condition of unsteady casting, and in the range of normal casting speed the fluctuation of the surface temperature of strand was less than ±5℃. In addition, the error between calculating temperature and measured temperature can be controlled in 10℃. The quality of continuous casting products has been significantly improved after the application of the control method.
2010 Vol. 45 (9): 48-48 [
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压力加工
53
DU Feng-shan Zhang Shang-Bin
A New Study on Online Control Model for Rolling Process of Strip
Based on discrete system fast finite element, a fast numerical calculation method is proposed to study the accurate and fast model of online control on plate or strip mill. After the deformation zone is meshed by finite distinct elements, taking the influence of shear strain on rolling force into consideration, fast model of rolling force has been obtained under the plane-strain condition. The rolling forces simulated by the model are in good agreement with that of Marc and experimentation. But the shearing deformation parameter is difficult to determine, we got the shearing deformation parameter by BP network on the background of kinds of operating models. The calculation of 1420 5-stand continuous rolling using the model can be completed within 0.3 seconds. The model is of great important to the application of online control on cold and hot tandem mill of strip.
2010 Vol. 45 (9): 53-53 [
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Research on Controlling shape of Hot Strip in 2150ASP
ASP is a new type of hot strip production line, adapting special production management and products variety, it is necessary that there is high adjusting capacity for flatness and profile in finishing mill. After using LVC technique, ASPB technique, and other controlling methods, the problems that the shape for high strength steel and ultra low carbon steel is difficult to control have be solved, and production efficiency has been greatly improved on 2150ASP.
2010 Vol. 45 (9): 58-58 [
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62
HuiGang Wang
Research on Hot Rolling Mill Horizontal Vibration
The horizontal roller friction flutter model was established according to the nonlinear stick-slip friction characteristic of rolling interface. Then the work roll "jump vibration" model of horizontal direction was also established with unbalanced force caused by spindle. It shows that by numerical simulation when external disturbance forces is small the system is a periodic motion, external disturbance force is large the system appear chaotic state. when there has clearance between the roll machine seat and the frame, the vibration wave top was cut, and the system dynamics became worse. When the clearance and the spindle imbalance force were eliminated, the system dynamic better. The field measurement also shows that the vibration became weakened when implementing corresponding measures.
2010 Vol. 45 (9): 62-62 [
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钢铁材料
67
Pei Ying-hao 陈其安 Chen Qi`an Yun PEN TANG Guang-Bo
Effect of Alloy Element on the Microstructure of Grain Oriented Silicon Steel at High Temperature
The high temperature microstructure of grain oriented silicon steel at 850-1300℃ has been studied by using optical microscope and scanning electron microscope. The influences of alloy elements and temperature on austenite volume fraction, and the distribution of alloy elements in austenite and ferrite have been investigated. The results show that the temperature range for high temperature microstructure with maximum volume fraction of austenite phase in the grain oriented silicon steel of different chemical compositions is about 1100-1200℃, and the temperature for the maximum volume fraction of austenite phase increases with increase of the content of austenite-stabilizing elements. There is a linear relationship between the carbon content and austenite volume fraction in grain oriented silicon steel at high temperature.
2010 Vol. 45 (9): 67-67 [
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72
suhang
Effect of cooling rate on the M-A constituents and toughness in normalized 10MnNiCr steel for ship hull
The effect of cooling rate on the M-A constituents and mechanical properties in normalized 10MnNiCr steel was investigated using Gleeble simulation, microstructure observation and hardness and impact energy measurement. The results indicate that the island-like M-A constituents formed in the steel after normalization in an extensive range of cooling rate from 0.167 to 15o C/s. With the cooling rated increased, the polygonal ferrite as the matrix neighboring to the islands was replaced gradually by bainitic ferrite. This resulted in the morphological variation of island from large massive to small elongated ones. The improvement of impact toughness could be attributed to the decrease of microhardenss in M-A constituents and refinement of matrix phase as the cooling rate increased.
2010 Vol. 45 (9): 72-72 [
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Hot-rolled microstructure analysis of X100 pipeline steel
In this paper, hot-rolling tests, using scanning electron microscopy, TEM observation and analysis of EBSD technology, microstructure and mechanical properties relationship. Studies have shown that: Micro-organizations GB + AF-based organizations, AF was typical of the organization's long needle-like; to massive changes in the form of quasi-polygonal ferrite-based, interior contains a lot of dislocation, the formation of high dislocation density of dislocations cell, dislocation lines distributed small precipitates with high strength and good impact toughness; wide-angle grain boundary analysis of the region's total grain boundary of 88%, wide-angle grain boundary are mainly distributed in 30 ~ 60 °, on the impact of very beneficial to toughness.
2010 Vol. 45 (9): 77-77 [
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STUDY OF CREEP BEHABIOR OF P92 STEEL
Based on the creep data, the creep rupture strength extrapolation curve of P92 steel was calculated, the extrapolated strength from which were similar to the data of ECCC. The creep characteristic of the new generation heat resistant steel P92 was studied as well, the values of Norton stress exponents of high stresses creep indicated that the creep mechanism was dislocation mechanism. The results of microstructure investigation showed that the strengthening mechanism of P92 steel was dislocation and dispersion strengthening. There were high density dislocations inside the martensite lath and carbide M23C6 between the martensite lath and disperse carbonitride MX , these were the reason why P92 steel had a high strength. The heat resistance of P92 steel decreased with the decreasing dislocation density and precipitated phases coarsening.
2010 Vol. 45 (9): 82-82 [
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86
CUI Yan Wang Rui-zhen Wang
Effect of Continous Annealing on Bake Hardening Property of Ultra-low Carbon Steel
This article study effect of continous annealing on bake hardening property of the ultra low carbon steel through experiments. The result of study shows that: with the increase of annealing temperature, the bake hardening property of steel improved, because increasing the annealing temperature can not only improve the dissolution of NbC, but also appropriately increase the grain size which make the grain boundary segregation of carbon atoms decreased. Improving the cooling velocity of slow cooling section can also improve the bake hardening property because the precipitation of NbC decreased. The cooling velocity of fast cooling section and over aging temperature have no significant effect on bake hardening property. Improving the cooling velocity after over aging can obstruct the grain boundary segregation of carbon atoms, so it’s beneficial to improving the bake hardening property.
2010 Vol. 45 (9): 86-86 [
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环保与能源
91
Dynamic Experimentation on Meso-Structured Nanometer γ-Al2O3 Dealing with Reusing Zongpai Water of Baogang
The thesis identified factors which influenced meso-structured nanometer γ-Al2O3 absorption effectiveness, that was water flux time and rate, through dynamic experiment of meso-structured nanometer γ-Al2O3 dealing with SO42-、Cl-、Ca2+ from reusing Zongpai water of used blast furnace circulating cooling water of Baogang. The results showed that SO42- removal rate was 88% when pH=5, flux time was 10 min and flux rate was 15L/h; Cl- removal rate was 75%when pH=5, flux time was 10 min and flux rate was 60L/h; Ca2+ removal rate was 84% when pH=11, flux time was 10 min and flux rate was 60L/h.
2010 Vol. 45 (9): 91-91 [
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技术交流
94
Wu Kang－Mian
Research on Mechanism of Poor Adhesion of Coated Layer in HDG
Normal Fe-Al inhibition layer has been clearly observed under SEM through inclined specimen grinding. Research results show that there are different causes for poor coated layer adhesion in actual production, but abnormal coated lay structure can be found out in every case of poor adhesion. When the ratio of air to fuel gas is unsuitably low in NOF section, carbon enrichment on strip surface will occurs which makes poor coated layer adhesion. When the ratio is unsuitably high, thick oxidation film on strip surface makes it difficult to be deoxidized by reduction section. Poor deoxidized surface results in bad adhesion. In this case, many ZnO particles exist in the coated layer near steel substrate. Delaminated Zn layer causes bad adhesion with ZnO phase found in the delaminated place.
2010 Vol. 45 (9): 94-94 [
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