Advances in the Production of Bearing Steels by Modern Secondary Metallurgy and Continuous Casting

2009 ◽  
pp. 271-271-13
Author(s):  
K-J Kremer ◽  
H-P Jung ◽  
G Peschke ◽  
F Rakoski
Keyword(s):  
Continuous Casting ◽  
Secondary Metallurgy ◽  
Bearing Steels

scholarly journals The Influence of Ti on the Hot Ductility of Nb-bearing Steels in Simulated Continuous Casting Process.

2002 ◽  
Vol 42 (3) ◽  
pp. 273-282 ◽  
Author(s):  
Haiwen Luo ◽  
L. Pentti Karjalainen ◽  
David A. Porter ◽  
Heidi-Marja Liimatainen ◽  
Yan Zhang
Keyword(s):  
Continuous Casting ◽  
Casting Process ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Bearing Steels

The Influence of Argon Flow on Inclusion Characteristic and Fatigue Life of Continuous Casting Bearing Steels

2011 ◽  
Vol 418-420 ◽  
pp. 972-976
Author(s):  
Chin Chuan Hsu ◽  
Ho Hua Chung
Keyword(s):  
Fatigue Life ◽  
Continuous Casting ◽  
Extreme Values ◽  
Energy Dispersive Spectrometer ◽  
Casting Process ◽  
Inclusion Size ◽  
Bearing Steel ◽  
Inclusion Type ◽  
Bearing Steels ◽  
Argon Flow

In this study, scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) are used to measure the inclusion size and identify the inclusion type respectively. The evaluated maximum nonmetallic inclusion size of bearing steel has been obtained by using statistics of extreme values (SEV). The influence of argon flow of the continuous casting process on the inclusion characteristics of bearing steels has been estimated, the influence of size and type of inclusion of bearing steel on its fatigue life have been discussed as well. It was found that most inclusions in steels are oxysulfide and alumina cluster. With the decreasing of the argon flow, the inclusion size gets larger and the amount of cluster-type inclusion also increases. In addition, by adopting the criterion of return period (T) at 200, the serial analyses show that the relation between predicted inclusion size for max and the argon flow is inverse proportion, but the fatigue life of steel is proportional to argon flow. A correlation among argon flow, inclusion size and fatigue life of bearing steel has been established in this study.

Computational Modelling of Oxide Surface Tensions in Secondary Metallurgy and Continuous Casting

2010 ◽  
Vol 81 (11) ◽  
pp. 959-964 ◽  
Author(s):  
E.-P. Heikkinen ◽  
J. Riipi ◽  
T. Fabritius ◽  
R. Pajarre ◽  
P. Koukkari
Keyword(s):  
Continuous Casting ◽  
Computational Modelling ◽  
Oxide Surface ◽  
Surface Tensions ◽  
Secondary Metallurgy

Analysis of Internal Defects Appeared in the Continuous Casting

2018 ◽  
Vol 16 (14) ◽  
pp. 23-27
Author(s):  
Elena Valentina Stoian ◽  
Vasile Bratu ◽  
Cristiana Maria Enescu ◽  
Carmen Otilia Rusanescu
Keyword(s):  
Continuous Casting ◽  
Internal Defects ◽  
Secondary Metallurgy ◽  
Central Porosity ◽  
Steel Grades ◽  
Continuously Cast

Abstract The paper presents the study of internal defects resulting from the continuous casting of steels. The 50 samples were taken from a total of 20 continuously cast bits of different steel grades. The investigation of the causes of internal defects, shown on the analyzed samples, started from the assumption that the secondary metallurgy was performed correctly. The following internal defects have been evident: internal cracks (axial cracks, section cracks), central porosity and marginal punctuation impurities.

Fatigue property evaluation of bearing steels issued from rotary continuous casting

1992 ◽  
Vol 89 (10) ◽  
pp. 877-886 ◽  
Author(s):  
G. Baudry ◽  
J. Saleil ◽  
G. Giroud ◽  
G. Duplomb ◽  
J.H. Bulit ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Fatigue Property ◽  
Bearing Steels ◽  
Property Evaluation

Ultra low aluminium DWI grade development of an atypical continuous casting powder with high viscosity

2009 ◽  
Vol 106 (6) ◽  
pp. 242-247
Author(s):  
C. Damerval ◽  
H. Tavernier ◽  
L. Avedian ◽  
P. Disant ◽  
P. Delfosse ◽  
...  
Keyword(s):  
Continuous Casting ◽  
High Viscosity

Influence of technology parameters of free-cutting steel continuous casting on the billet internal structure

2020 ◽  
Vol 76 (2) ◽  
pp. 139-142
Author(s):  
A. T. Kunakbaeva ◽  
A. M. Stolyarov ◽  
M. V. Potapova
Keyword(s):  
Regression Analysis ◽  
Continuous Casting ◽  
Internal Structure ◽  
Sulfur Content ◽  
Manganese Content ◽  
High Quality ◽  
Correlation And Regression Analysis ◽  
Cutting Steel ◽  
Continuously Cast

Free-cutting steel gains specific working properties thanks to the high content of sulfur and phosphorus. These elements, especially sulfur, have a rather high tendency to segregation. Therefore, segregation defects in free-cutting steel continuously cast billets can be significantly developed. The aim of the work was to study the influence of the chemical composition of freecutting steel and casting technological parameters on the quality of the macrostructure of continuously cast billets. A metallographic assessment of the internal structure of cast metal made of free-cutting steel and data processing by application of correlation and regression analysis were the research methods. The array of production data of 43 heats of free-cutting steel of grade A12 was studied. Steel casting on a five-strand radial type continuous casting machine was carried out by various methods of metal pouring from tundish into the molds. Metal of 19 heats was poured with an open stream, and 24 heats – by a closed stream through submerged nozzles with a vertical hole. High-quality billets had a cross-sectional size of 150×150 mm. The macrostructure of high-quality square billets made of free-cutting steel of A12 grade is characterized by the presence of central porosity, axial segregation and peripheral point contamination, the degree of development of which was in the range from 1.5 to 2.0 points, segregation cracks and strips – about 1.0 points. In the course of casting with an open stream, almost all of these defects are more developed comparing with the casting by a closed stream. As a result of correlation and regression analysis, linear dependences of the development degree of segregation cracks and strips both axial and angular on the sulfur content in steel and on the ratio of manganese content to sulfur content were established. The degree of these defects development increases with growing of sulfur content in steel of A12 grade. These defects had especially strong development when sulfur content in steel was of more than 0.10%. To improve the quality of cast metal, it is necessary to have the ratio of the manganese content to the sulfur content in the metal more than eight.

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