Dissertation > Excellent graduate degree dissertation topics show

Research on Microscopic Structure of X70 Pipeline Steel and Inclusions Controlment in Casting Slab

Author: WuYuChen
Tutor: ZuoXiaoLin；LiJunGuo
School: Hebei University of Technology
Course: Iron and steel metallurgy
Keywords: X70 pipeline steel Inclusions Microstructure Tundish Numerical Simulation Structural optimization
CLC: TF777
Type: Master's thesis
Year: 2009
Downloads: 70
Quote: 0
Read: Download Dissertation

Abstract


In recent years , the development of the national economy is increasingly urgent demand for high grade pipeline steels , the major steel companies at home and abroad are actively developing high steel grade pipe steel . As the largest modern iron and steel enterprises in Hebei Province , Tangshan Iron and Steel urgent need to develop high-level pipeline steel , so as to fill the blank in this field in the province . Industrial test sampling the number of inclusions of X70 pipeline steel slab , size , shape and composition , microstructure and mechanical properties of the X70 finished board , evaluation of the existing process of X70 pipeline steel Organization and inclusions the control . 1700 slab tundish molten steel flow and inclusion motion behavior by the numerical simulation of the Fluent software , research , and tundish flow control structure analysis, evaluation and optimization design and production of high quality for the Tangshan Iron and Steel X70 pipeline steel must theoretical basis . The main conclusions are as follows : High Niobium X70 Pipeline Steel organizations the acicular ferrite ideal , precipitates Nb , Ti nitride and carbonitride , organization , and mechanical properties of X70 pipeline steel to meet the technical requirements . X70 pipeline steel slab microscopic inclusions are mostly spherical, scattered, smaller particle size ; higher than other similar products in the average oxygen content in steel ; higher levels of large inclusions reached 4.37mg/10kg , and granularity relatively large , multi- aluminosilicate composite inclusions and calcium aluminate complex inclusions . The 1700 slab that are provided in the tundish flow control apparatus can significantly improve the state and the temperature distribution of molten steel flow , improve the rejection rate of the inclusions ; pulling speed has little effect on the flow of the liquid steel in a tundish state . Considering tundish Steel Fluid Flow , temperature field and inclusions preclude the rate of three factors , the steady flow plus 555mm tundish dam is the best structure , can further improve the tundish molten steel flow state and temperature distribution , equivalent diameter of 10 ~ 150μm inclusions exclusion rate increased from 6.5% to 12.5% ??.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Reactive Hot-Pressing and Mechanical Properties of （ZrB2-ZrO2）/BN Composites,TB332
  3. Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys,TG146.22
  4. Investigation on Microstructure and Properties of Cadmium-Free Silver-Based Intermediate Temperature Filler Metals,TG425.2
  5. Study on Springback of High-Strength Steel Stamping,TG386
  6. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  7. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  8. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  9. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  10. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  11. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  12. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  13. Numerical Simulation of Biomass Direct Reburning,TK16
  14. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  15. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  16. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  17. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23
  18. Characteristic Study of Combustion in Central Reverse Flame Chamber,TK223.21
  19. Numerical Simulation and Contrastive Analysis of Labyrinth Seals and Leaf Seals,TK263.2
  20. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  21. The Investigations on the Characteristics and Mechanism of NIR Emission from Bi-doped Silicophosphate Glasses,TQ171.1

CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Ingot > Continuous cast steel,near net shape casting
© 2012 www.DissertationTopic.Net  Mobile