Dissertation > Excellent graduate degree dissertation topics show

Study on J4 Stainless Steel Continuous Casting Flux

Author: LiuPeng
Tutor: WangYu
School: Chongqing University
Course: Metallurgical Engineering
Keywords: J4 stainless steel high-temperature thermal and physical properties of steel performance of mold flux slab quality
CLC: TF777
Type: Master's thesis
Year: 2009
Downloads: 240
Quote: 0
Read: Download Dissertation

Abstract


J4 stainless steel is a Cr-Mn-Ni stainless steel, which is equivalent to the United States series of AISI200 stainless steel, the applications of J4 stainless steel is large widely.At present, the high-temperature thermal properties of J4 stainless steel are lacked.and its lead difficulties in choosing slag and formulating continuous casting technology draft, there is an urgent need for steel based on the thermal properties of high temperature materials, on-site process on the basis of the corresponding flux suitable for research.Southwest Stainless Steel Co Ltd is the Southwest region’s largest private steel company. There are depression and cracks with varying degrees of J4 stainless steel slab surface in the continuous casting production process. This paper studies high-temperature of J4 stainless steel mechanical properties, thermal properties, on-site mold the flow characteristics of molten steel, explore in the mold casting solidification and crack sensitivity of the characteristics and the southwest cast stainless steel continuous casting machines and related parameters of the production process conditions, obtain appropriate corresponding flux, through the study of this article:①This paper studies high temperature properties and thermal properties of the J4 stainless steel through use DIL402C use analyzer of thermal expansion, STA449C simultaneous thermal analyzer and Gleeble-1500D thermal simulation testing machine in domestic first systematically, and the scope of expansion coefficient is 23.8915×10-6 ~ 35.1729×10-6 in decreasing process of .Zero strength temperature is 1400℃. Zero plastic temperature is 1350℃. High temperature brittle zone is relatively widely; J4 slab steel high-temperature brittle zone is 1250℃~ melting point , fragile area 650 ~ 950℃, plastic District for the 950 ~ 1250℃, plastic zone cross-section low shrinkage, crack is sensitive. Stainless steel slab J4 poor mechanical properties of high temperature, thermal properties of complex and changeable, and its solidification contraction meniscus region in uneven heat transfer caused by solidification shrinkage Initial Solidification Shell uneven.②The author simulates the on-site mold flow of steel liquid by fluid FLUENT combination of software, analyses the effect on the flow field and temperature field of molten steel in mold of different nozzle parameters and different sections etc. Combined with high-temperature mechanical properties and thermal properties of steel J4, bring forward requirements and limitations of the main performance indicators of the continuous casting mold flux from these two aspects.③Based on performance testing and process analysis of J4 steel, confirming performance of flux, make flux more targeted. Design slag system of CaO-SiO2-Al2O3-Na2O-F--MgO-MnO in the laboratory to study the influence of component on the melting temperature, viscosity and viscous flow activation energy. And ultimately determine the main performance indicators of the steel continuous casting flux suitable for Southwest J4 stainless: R = 1.10, Tm=1140±5℃,η1300℃=0.28±0.04Pa·s, slag consumption is 0.45kg / tsteel.④The field test shows: the slab cracks fall from 2.4 percent to 0.11 percent, the ratio needs to grinding out seriously of the depression deficiencies declines to 12% from 60%, scarring droping from the 2.3% to 0.10%, which basically meet to the requirements of the enterprise and reach a goal to increase the economic efficiency of enterprises substantially.

Related Dissertations

  1. The Application and Practice of Interrelated Technologies in Revamping of 1930mm Slab Caster in Baosteel,TF341.6
  2. Influences of EMBr on Metallurgical Behavior and Slab Quality in CSP Processes,TF777
  3. Research and Numerical Simulation of New Continuous Straightening Curve,TF777.1
  4. Numerical Simulation and Experiment Study on Electromagnetic Stirring Process in Continuous Casting Mold of Round Billets,TF341.6
  5. Study on the Optimization of Mould Electromagntic Stirring Process Parameters,TF777
  6. Study on the Process for Controlling the Cleanness of Molten Steel and Its Application for Medium-Thin Slab Continuous Casting,TF777
  7. Study of Slab Quality on Unsteady Casting Conditions and Liquid Steel Behavior in Mold,TF777.1
  8. Numerical Simulation on EMS in Continuous Casting Mold of Billets and Its Application at ChongSteel,TF777.2
  9. Continuous casting mold oscillation process parameter optimization and slab quality research,TF777.1
  10. The Research of the Slab Quality about the Container-sheet Processing,TG335.11
  11. Multi-dimensional Statistical Analysis and Research on Decision Tree Rule of Casts the Semi Finished Product Quality,TG24
  12. Study on Facial Longitudinal Crack of Slabs at Shaogang,TF777
  13. Research on Slab Designing and Matching Optimization Problems in Iron & Steel Enterprise,TF777
  14. Experimental Research on Liquid Metal Free Surface Behavior under Compound Magnetic Field,TF777
  15. Forecasting Study on Quality of Slab in Continuous Casting Slab Producting Process,TF777
  16. Study on Ni-based Tenacious Wear-resistance Gradient Coating In-situ Prepared by Laser on the Surface of Crystallizer Copper Alloy,TF777
  17. Study on the Preparation of Refractories Used for the Submerged Entry Nozzle,TF777
  18. The Design and Development of Steelmaking Continuous Casting and Mould Casting Scheduling System,TF777
  19. Study on Secondary Cool Dynamic Controlling Model of Continuous Casting for Medium Thickness Slab,TF777.1
  20. The Trial of Producing Aluminum Killed Steel by Short Carved Caster,TF777.1
  21. Study on Carbon and Nitrogen Control during the Production of IF Steel,TF777

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