Effect of non-metallic inclusions on properties of cast steel

Wear ◽  
1969 ◽  
Vol 13 (4-5) ◽  
pp. 376
Keyword(s):  
Cast Steel ◽  
Metallic Inclusions

scholarly journals Technological Aspects of Low-Alloyed Cast Steel Massive Casting Manufacturing

2013 ◽  
Vol 13 (4) ◽  
pp. 97-102
Author(s):  
J. Szajnara ◽  
A. Studnicki ◽  
M. Kondracki ◽  
J. Głownia
Keyword(s):  
Wear Resistance ◽  
Quantitative Analysis ◽  
Steel Casting ◽  
Complex Geometry ◽  
Cast Steel ◽  
Secondary Crystallization ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
Alloyed Cast ◽  
Metallic Inclusions

Abstract In the paper authors have undertaken the attempt of explaining the causes of cracks net occurrence on a massive 3-ton cast steel casting with complex geometry. Material used for casting manufacturing was the low-alloyed cast steel with increased wear resistance modified with vanadium and titanium. The studies included the primary and secondary crystallization analysis with use of TDA and the qualitative and quantitative analysis of non-metallic inclusions.

Numerical Modeling of Nonmetallic Inclusions Flowing Out during Solidification of Continuous Cast Steel Billets in Mould Zone

2012 ◽  
Vol 706-709 ◽  
pp. 1385-1390 ◽  
Author(s):  
Wlodzimierz Derda ◽  
Ireneusz Staniewski
Keyword(s):  
Liquid Steel ◽  
Cast Steel ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Continuous Cast ◽  
Metallic Inclusions ◽  
Different Types ◽  
Metal Volume ◽  
Steel Grades ◽  
Continuous Cast Steel

Developing the metallurgical purity of steel products requires, among other things, the understanding of the behavior of non-metallic inclusions (NMI) in the bulk of liquid steel in the mould zone within the forming skin of a concast billet. The identification of the mode of NMI distribution with different values of casting parameters influencing the state of the metal in the mould, including electromagnetic stirring intensity, may be of key importance to developing the metallurgical purity of concast billets being cast. The present article discusses the analysis of the results of simulation of NMI flowing out from the liquid steel volume in the mould zone of the steel continuous casting machine (CCM). As the investigation object, two different types of square cross-section mould were chosen, while for carrying out computations for two selected steel grades, a hydrodynamic module (HDM) being an extension of the FLUENT® program was employed. The use of this module made it possible to take consideration of the influence of the EMS-M type electromagnetic stirrer on the conditions of NMI flotation and distribution in the metal volume within the mould for defined thermal – dynamical conditions.

scholarly journals Influence of Rare Earth Metals on Microstructure and Inclusions Morphology G17CrMo5-5 Cast Steel

2014 ◽  
Vol 59 (3) ◽  
pp. 993-996 ◽  
Author(s):  
J. Kasińska
Keyword(s):  
Rare Earth ◽  
Carbon Steel ◽  
Liquid Metal ◽  
Cast Steel ◽  
Rare Earth Metals ◽  
Metallic Inclusions

Abstract This paper presents influence of rare earth metals (REM) on the microstructure and morphology of non-metallic inclusions of G17CrMo5-5 cast carbon steel The research has been performed on successive industrial melts. Each time about 2000 kg of liquid metal was modified. The REM was in the form of mishmetal of the composition 49, 8% Ce, 21, 8% La, 17, 1% Nd, 5, 5% Pr and 5, 35% the rest of REM. Therareearth metals were put into the ladle during tapping of heat melt from the furnace.

scholarly journals Effects of Cr - Ni 18/9 Austenitic Cast Steel Modification by Mischmetal

2012 ◽  
Vol 12 (4) ◽  
pp. 47-52
Author(s):  
M. Gajewski ◽  
J. Kasińska
Keyword(s):  
Mechanical Properties ◽  
Intergranular Corrosion ◽  
High Efficiency ◽  
Cast Steel ◽  
Electric Induction ◽  
Δ Ferrite ◽  
Steel Modification ◽  
Metallic Inclusions ◽  
Basic Lining ◽  
Final Effect

Abstract This paper presents the results of Cr - Ni 18/9 austenitic cast steel modifications by mischmetal. The study was conducted on industrial melts. Cast steel was melted in an electric induction furnace with a capacity of 2000 kg and a basic lining crucible. .The mischmetal was introduced into the ladle during tapping of the cast steel from the furnace. The effectiveness of modification was examined with the carbon content of 0.1% and the presence of δ ferrite in the structure of cast steel stabilized with titanium. The changes in the structure of cast steel and their effect on mechanical properties and intergranular corrosion were studied. It was found that rare earth metals decrease the sulfur content in cast steel and above all, they cause a distinct change in morphology of the δ ferrite and non-metallic inclusions. These changes have improved mechanical properties. R02, Rm, and A5 and toughness increased significantly. There was a great increase of the resistance to intergranular corrosion in the Huey test. The study confirmed the high efficiency of cast steel modification by mischmetal in industrial environments. The final effect of modification depends on the form and manner of placing mischmetal into the liquid metal and the melting technology, ie the degree of deoxidation and desulfurization of the metal in the furnace.

scholarly journals Influence of Low-Alloy Cast Steel Modification on Primary Structure Refinement, Type and Shape of Non-Metallic Inclusions

2015 ◽  
Vol 60 (1) ◽  
pp. 77-83
Author(s):  
D. Bartocha ◽  
J. Suchoń ◽  
Cz. Baron ◽  
J. Szajnar
Keyword(s):  
Primary Structure ◽  
Structure Refinement ◽  
Cast Steel ◽  
Vacuum Refining ◽  
Slag Refining ◽  
Steel Modification ◽  
Metallic Inclusions ◽  
Alloy Cast

Abstract In the article there are presented methods and results of investigation which main aim were determination of influence of melting technology (gas extraction, vacuum refining, slag refining and extraction, deoxidation and degassing) and type of used modifiers on the type and shape of non-metallic inclusions and the primary structure refining. Low alloy cast steel melted in laboratory conditions, in an inductive furnace was investigated. Additions of FeNb, FeV, FeTi and FeZr modifiers were applied. The contents of oxygen and nitrogen in obtained cast steel were determined. The most advantageous impact on refining of the primary structure of has been found for the modifiers FeTi+FeZr. In cast steel with the addition of Zr the conglomerates from a different non -metallic inclusions have been observed. Zirconium probably plays role of the nucleus - creating for other inclusions present in the conglomerates. Clusters of inclusions due to their size affect the crystallization and grain growth processes reducing grain size of the primary structure.

Non-Metallic Inclusions Control for High Strength Anti-HIC X65 Tube Steel

2012 ◽  
Vol 581-582 ◽  
pp. 1062-1067
Author(s):  
Jian Wang ◽  
Yong Chen ◽  
Sheng Quan Huang ◽  
Jian Hua Zeng ◽  
Liang Gang Yi ◽  
...  
Keyword(s):  
Sulfur Content ◽  
Phosphorus Content ◽  
Cast Steel ◽  
High Strength ◽  
Tube Steel ◽  
Hot Metal ◽  
High Sulfur Content ◽  
Metallic Inclusions ◽  
Small Spherical Particle ◽  
Inclusion Control

The hot metal fed converter in Panzhihua Steel Company is characterized by high sulfur content of 0.085% and high phosphorus content of 0.133%. Under this condition, some technologies like control of sulfur and T[O] content, ladle slag optimization, calcium treatment and protective casting were used in practice, and the desired result of T[O] as low as 0.0014% and sulfur content of 0.0023%was achieved, which met the cleanness requirements by anti-HIC X65 tube steel. With the help of inclusion control technology, grade of inclusions in as-cast steel was less than 0.5. In addition, total amount of inclusions was only 0.0044% which dispersed in slab in form of small spherical particle.

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