Chemistry effects on the crack susceptibility of structural steels during continuous casting

2001 ◽  
Vol 72 (11-12) ◽  
pp. 496-502 ◽  
Author(s):  
Wolfgang Bleck ◽  
Winfried Dahl ◽  
Gunnar Picht ◽  
Gerhard Pariser
Keyword(s):  
Continuous Casting ◽  
Structural Steels ◽  
Crack Susceptibility

scholarly journals Effects of metallurgical factors on reticular crack formations in Nb-bearing pipeline steel

2020 ◽  
Vol 39 (1) ◽  
pp. 81-87 ◽  
Author(s):  
Hangyu Zhu ◽  
Lanqing Wang ◽  
Jianli Li ◽  
Jixuan Zhao ◽  
Yue Yu
Keyword(s):  
Iron Oxide ◽  
Continuous Casting ◽  
Pipeline Steel ◽  
Solidification Process ◽  
Casting Process ◽  
Chemical Compositions ◽  
Steel Matrix ◽  
Continuous Casting Process ◽  
Residual Elements ◽  
Crack Susceptibility

AbstractMicroscopic morphologies of reticular cracks in Nb-bearing pipeline surfaces are shown in this work. A decarburization layer, oxidized round spots, and the distributions of residual elements are each detected to better understand the mechanisms of reticular crack formations. The results show that reticular cracks are discontinuously distributed and filled with iron oxide. The oxidized round spots near the crack sides are larger and more intensive than steel matrix, with primary chemical compositions of Fe, Mn, and Si oxides. There is no obvious enrichment of Cu, Cr, or Sn near the crack zones. The formation of reticular cracks occurs prior to both decarburization and the formation of oxidized round spots. The ferrite potential (FP) of the examined pipeline steel is 1.05, which leads to a higher relative crack susceptibility. It is concluded that reticular cracks are generated during the continuous casting solidification process due to the extension of intergranular microcracks along grain boundaries under the abnormal conditions of the continuous casting process.

scholarly journals Converging criteria to characterize crack susceptibility in a micro-alloyed steel during continuous casting

2020 ◽  
Vol 772 ◽  
pp. 138691 ◽  
Author(s):  
Rosa M. Pineda Huitron ◽  
Pavel E. Ramirez Lopez ◽  
Esa Vuorinen ◽  
Robin Jentner ◽  
Maija E. Kärkkäinen
Keyword(s):  
Continuous Casting ◽  
Alloyed Steel ◽  
Micro Alloyed Steel ◽  
Crack Susceptibility

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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