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2015 Vol. 34 No. 4
Published: 2015-08-15
CONTINUOUS CASTING
Continuous Casting Technology
Strand Quality
Continuous Casting Equipment
continuous casting technology
1
HE Yang，LIU Jian-hua，HAN Zhi-biao，YANG Bo-feng，LIU Jian，JI Yi-long
Effects of La on mechanical properties of fecral stainless steel under high temperature
In order to explore the effects of La on mechanical properties of FeCrAl stainless steel under high temperature， mechanical properties under high temperature were tested on FeCrAl stainless steel by gleeble 3500. The fracture microstructure and morphology of the investigated steel after drawing were analyzed by means of Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). The results show that the addition of La improves the tensile strength of FeCrAl stainless steel and removes the third brittleness zone. From the analysis results of fracture morphology， deep dimples were found on the surface of fracture under the temperature of high plastic zone， and the fracture mechanism mainly belongs to transcrystalline rupture. Cleavage fracture and shallow dimples were found on the surface of fracture under the temperature of low plastic zone， and the fracture mechanism mainly belongs to intergranular fracture.
2015 Vol. 34 (4): 1-8 [
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9
GUO Wei-da，MA Zhong-wei，XIAO Qiang，HU Peng，CHEN Yong-sheng，ZHANG Hui
Simulation experiments for slivers on the edge of heavy plate
Steel plates have to change their size or even change into batch waste caused by slivers on plate edge which is came from folding of the plate edge during the production in heavy plate. The reasons for slivers and folding were found by inspecting and analyzing samples from simulating rolling slab experiments.
2015 Vol. 34 (4): 9-12 [
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13
YANG Ji，REN Bing-zhi，HAN Zhi-wei，SHEN Hou-fa
Coupling of fluid flow and solidification with roll type electromagnetic stirring in continuous slab casting
Based on the Maxwell’s and the[k-ε]turbulence equations， a transportation model has been developed to simulate the electromagnetic stirring (EMS) in a solidifying strand. The interaction of solidification and fluid flow in an ultra-thick slab under the effect of roll-type EMS has been investigated. The results show that solidified shell significantly weakens the effect of EMS. The velocity of molten steel and the range of the re-circulation region in liquid pool decrease compared to those without solidification in continuous slab casting. The solid shell is influenced by the interaction of heat transfer and fluid flow with EMS.
2015 Vol. 34 (4): 13-17 [
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18
ZHOU Li，WANG Xin-Hua，DENG Xiao-xuan，LI Lin-ping，WANG Wan-jun
Discussion of effective thermal conductivity in heat transfer models of continuous casting
Deals with the influence of effective thermal conductivity on the results of heat transfer models of continuous casting. Heat transfer models can predict the surface temperature and solidification end accurately， but shell thickness of the earlier stage of solidification becomes thinner when thermal conductivity is large. On the other hand， the value of thermal conductivity affects the prediction of mushy zone greatly. When the thermal conductivity is larger， the liquid steel turn into the mushy zone earlier. Hence， the thickness of mushy zone is thicker， temperature gradient in the mushy zone is smaller， and local solidification time is longer. Changing convection equivalent factor[（m）]to fit the calculated number and measured number is practicable method to determine the value of m. As to casting machine， while setting[m＝7]in the force convection area，[m＝5]in the transition region of force convection and natural convection， [m＝3]in the natural convection and[m＝1]in the stagnant region， an exact modeling result can be obtained.
2015 Vol. 34 (4): 18-23 [
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24
TIAN Qian-ying，FU Yan-mian
Study of the secondary cooling system of 700 mm×1 500 mm thick rectangular casting billet
Exploratory development on 700 mm×1 500 mm thick rectangular billet， the only standard about evaluating the feasibility of the study is to obtain the high-quality casting billet which can meet the conditions. Have analyzed the scheme by means of the empirical calculation and the finite element simulation from the aspects of model choice， casting speed， secondary cooling system， etc.， and then contrasted the cloud picture and curve to verify the feasibility of it.
2015 Vol. 34 (4): 24-30 [
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31
WANG Qi， LUO Zhi-guo， RU Jia-sheng
Simulation on the discrete phase movement in mold with argon blowing process
A mathematical model was developed to describe the bubble coalescence， inclusion coalescence， and inclusion adhesion mechanism on the bubbles in the continuous casting mold. This model included the Eulerian-Lagrangian method to predict the size， the speed of discrete phase (including the argon bubble and inclusion)， etc. Though the statistical analysis of discrete particles (including the bubbles and inclusions)， the effects of blowing argon on inclusion removal were obtained.
2015 Vol. 34 (4): 31-34 [
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MA E，LU Xian-hui， LIU Hong-yan
Research and practice of the slab casting mould level fluctuation
Since 2013，variety steel’s production of He Steel Hanbao company steelmaking plant is increased， but the problems that the casting mould level fluctuation causes quality problems occur occasionally. In this paper， the author found out the different types of mould level fluctuation and its characteristic curve through on-site tracking. According to the liquid level fluctuation causes， the corresponding optimization measures were taken. Through the technical research， notable results were achieved. (1) Fluctuation meniscus?furnace?ratio?was lowered from 9.63%?to 3.47%； (2) For ultra-low carbon steel， SEN nozzle replacement ratio due to the fluctuation of meniscus was reduced from?16.67% to 6.67%； (3）The level of fluctuation of the liquid level control was improved， the severity and frequency of the surface wave was reduced， and the quality of products was enhanced.
2015 Vol. 34 (4): 35-39 [
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continuous casting equipment
40
ZHAO Shu-mao，HU Xiao-bing，MEI Guo-hui
Thermal stress analysis of continuous liquid steel temperature sensor
Transient thermal analysis of continuous liquid steel temperature sensors（CLSTS）was carried out by finite element method， and the finite element model was proved by the real measurement data of temperature. After that， the dynamic stress field of sensors was computed from the temperature field by indirect coupling method. The results showed that high stress area for ordinary and corrosion-resisting CLSTS was between 250 and 450 mm above the bottom， while the one for fast response CLSTS located at the junction between different materials. The maximum thermal stress at high value zone reached its peak after CLSTS was inserted into molten steel for about 40 s. And the peak values of thermal stress were 3.2 MPa， 3.4 MPa and 6.0 MPa for ordinary， corrosion-resisting and fast response CTSFL individually.
2015 Vol. 34 (4): 40-47 [
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48
WANG Hui，ZHOU Li-hong，LU Lu，LIANG Li
Development of maanshan iron and steel thin slab continuous casting with liquid core reduction system
CSP of Masteel is one of the most advanced processes for hot rolled plate in the world at present. Four Segments was designed for the caster. The liquid core technology was used in the caster. Some theory， the software modification and application result involved in the transformation of the segment control system，which realized the liquid core reduction of slab from 90 mm to 60 mm are analyzed. This paper mainly introduced the structure， work principle， new breakthrough and use of LCR in Masteel.
2015 Vol. 34 (4): 48-50 [
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51
ZHANG Hong-ling，LI Jian-jun，MAO Jing-hua，DING Xiao-lin，YAN Jian-wu
Analysis of surface handling process for stainless steel slabs
This paper introduces the methods for stainless steel slabs surface handling，including methods for descaling and defect treatment of slabs surface. Descaling machine， water blast pool and shot blasting machine were used for descalingslabs surface. Grinding machine was used for slab surface defect cleaning. And the paper introduced the principle of descaling machine， water blast pool， shot blasting machine and grinding machine， and analyzed the characteristic of the handling methods.
2015 Vol. 34 (4): 51-53 [
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54
LU Xian-Hui，Ma E
Effect of casting process on Nb plate edge crack
Easy encountered transverse cracks in Nb steel plate edge were researched to improve the quality. Though hot pickling detection of slab, metallurgical testing of plate, petrographic analysis of mould powder etc., the origin of slab edge crack defect was confirmed. Slab edge crack mechanism was inductively analyzed. By optimizing continuous casting technology which included process control and optimization of secondary cooling, decreasing Als from 0.045% to 0.025%，adopting mould powder with low viscosity and low melting point for suitable crystallization temperature，and increasing slab straightening zone temperature higher than 900 ℃，the slab corner heat transmission was improved, and then the slab corner cracks and Nb steel edge transverse were controlled.
2015 Vol. 34 (4): 54-59 [
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strand quality
60
WANG Zhong-qi，WANG Xin-zhi，XIA Zhi-sheng，ZHANG Zhen-shen
Analysis and prevention of surface longitudinal cracks of atmospheric corrosion resisting steel slab
For surface longitudinal crack of the continuous casting slab of atmospheric corrosion resisting steel， in combination with the production practice， discussed the factors， such as composition， mold powder， mold cooling， secondary cooling， etc.， and put forward the improvement and optimization direction of continuous casting process. The production practice indicated that， by adjusting the Ni/Cu rate larger than 0.3， using a special powder of weathering resistant steel with high basicity， high melting point and low viscosity， adjusting the mould taper over 1.0% per meter， choosing the weak cooling in the mould and the secondary cooling zone， controlling the unsteady casting strictly， maintaining the superheat of molten steel at 20-30 ℃， stabling liquid surface fluctuation within 2%， casting speed fluctuation in ±0.2 m/min， the occurrence rate of the slab surface longitudinal cracks was reduced from more than 50% to 3%.
2015 Vol. 34 (4): 60-64 [
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LI Jian-wen，GAO Fu-bin，LIU Hong-yan
Control technology of subsurface inclusion defects of continuous casting slab
Mainly discussed the problems of "inclusion" about low carbon steel surface and subcutaneous.Through the "inclusion" sampling and SEM analysis，found that "inclusion" main ingredients for slag. in order to reduce these defects， took these measures such as stable the mold level， transverse speed， optimization of protection operation performance and so on.Application results show that low carbon steel as a result of the "inclusion" unscheduled rate reduced from 0.84% to 0.20%， casting quality is obviously improved.
2015 Vol. 34 (4): 65-68 [
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69
ZHAO Lei，REN Hai，LIU Guo-gui
Analysis of longitudinal cracks in the slab surface
This article describes longitudinal cracks of slab surface in No.4 continuous caster for the second steelmaking plant of ISC of Chongqing. The morphology and formation mechanism of longitudinal cracks are also analyzed. Finally， combining with production technology and equipment， the corresponding optimization improvements are proposed.
2015 Vol. 34 (4): 69-73 [
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74
LI Meng-xi，MA Kun-xia，FU Jian-jun，HAO Li-qing
Slab inner quality control practice of thin slab caster in high drawing speed
For solving the problems such as inner crack， central segregation and central porosity of slab in high speed thin slab continuous casting，the formation mechanism of slab inner defect were analyzed. Through controlling reduction ending positions，improving secondary cooling water and equipments installation accuracy， the slab’s inner quality was improved obviously. According to Mannesmann criteria for evaluation， the level of central crack of medium carbon was 1.5， and the level of central segregation of medium carbon steel was 1， and the level of central crack and central segregation of low carbon steel were 1.
2015 Vol. 34 (4): 74-77 [
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CONTINUOUS CASTING
78
WANG Zeng， PU Rui
Control measures for corner crack of low silicon boron steel
Mainly introduced the problem about corner crack of low silicon boron steel in the production practice of plate manufacture department of Rizhao steel. It reduced slab corner cutting rate and production cost， improved the efficiency of enterprises in the practical production， through controlling the continuous casting machine equipment precision， nitrogen content in steel and using chamfering crystallizer.
2015 Vol. 34 (4): 78-81 [
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