The Improvement in Steel Treatment

1903 ◽  
Vol 56 (1454supp) ◽  
pp. 23301-23301
Keyword(s):  
Author(s):  
Yuriy Akhmadeev ◽  
Ilya Lopatin ◽  
Yurii Ivanov ◽  
Elizaveta Petrikova ◽  
Maria Rygina

2006 ◽  
Vol 47 (6) ◽  
pp. 337-339 ◽  
Author(s):  
S. I. Kazakov ◽  
A. M. Chuklai ◽  
O. I. Frolov ◽  
V. Ya. Gushchin

2019 ◽  
Vol 129 (5) ◽  
pp. 494-497
Author(s):  
Peter Nagy ◽  
Samuel Dudley ◽  
Anthony Sheyn

Objectives: Examine outcomes of patients 1 month of age or less who received supraglottoplasty. Demonstrate the feasibility and safety of supraglottoplasty in neonates <1 month of age. Methods: Charts were reviewed from 2015-2017. Patients with previously identified laryngomalacia requiring surgical intervention and age 1 month or less were identified. We collected data on age, gender, surgical technique, other airway lesions, time to extubation and discharge, and comorbidities. Results: Six patients met the inclusion criteria of which four were male and two were female. Average age at time of surgery was 19.5 days. All patients had diagnosis of laryngomalacia made on flexible or direct laryngoscopy with increased work of breathing, reports of cyanotic episodes, or oxygen desaturations. All had feeding difficulties, and three had signs and history consistent with gastroesophageal reflux. Two patients underwent supraglottoplasty by CO2 laser treatment alone, one patient received cold steel treatment alone, and the remaining three patients received cold steel with supplemental microdebrider treatment. Out of six patients, five were extubated within 5 days of their procedure. The average time to extubation was 1.8 days. The average time to discharge was 24.25 days following surgery. Two patients required revisions. Conclusions: Supraglottoplasty in children younger than 1 month of age is rare. Despite the rare occurrence, it appears to be feasible early in life in treating laryngomalacia. Neonates with respiratory failure, apneas, and cyanosis, or difficulty feeding due to laryngomalacia should be evaluated and treated with supraglottoplasty.


2020 ◽  
Vol 989 ◽  
pp. 381-387
Author(s):  
Vlasta D. Tutarova ◽  
Alexey N. Shapovalov ◽  
Alexander N. Kalitaev

This article discusses the problems of efficient removal of nitrogen in the vacuum tank degasser operating at the electric arc furnace shop of Uralskaya Stal (Ural Steel) OJSC in the course of manufacturing of high-quality low carbon steel grades by means of steel grades «2» and «T». In order to determine the reasonable and balanced treatment parameters that ensure the required level of nitrogen content in the above steel grades, an analysis of production data for the period of November-December 2016 has been carried out. This analysis is the basis for identifying the vacuum degassing parameters in compliance with the technological capabilities and well-balanced levels, which allow predicting the level of nitrogen content in steel. To assess the cumulative quantitative effect of the main parameters of vacuum degassing on nitrogen removal, there has been performed a regression analysis. As a result, there have been obtained multiple regression equations describing a rational combination of steel treatment parameters for achieving the required nitrogen removal level.


2007 ◽  
Vol 2007 (7) ◽  
pp. 541-544
Author(s):  
I. Yu. Zinurov ◽  
V. Z. Fel’dman ◽  
A. D. Kiselev ◽  
S. E. Malkov ◽  
A. M. Shumakov ◽  
...  

Author(s):  
A. V. Protasov ◽  
B. A. Sivak ◽  
L. A. Smirnov

The modern steelmaking facilities melt as a rule a semi product, which is further subjected to various processes of refining in steel ladle. Recently an additional treatment of the metal in CCM tundish became widespread in the domestic and foreign practice. A tendency of transforming tundish into a multifunctional metallurgical reactor was noted, since more and more technological operations are transferred in it, including alloying, stirring, various methods of heating, modifying and removal of nonmetallic inclusions. Examples of comprehensive utilization of a bloom CCM tundish at some Japanese plants of Kobe Steel in Kakagava presnted, at which the metal is filtered when going through holes in the two partitions thus effectively removing nonmetallic inclusions. New variants of metal blowing off in the tundish by inert gas developed by domestic specialists considered, including a technology for metal blowing off by an inert gas and a facility for the inert gas supply through the stopper of the tundish. Supply of inert gas through the stopper results in efficiency increasing of degassing and nonmetallic inclusions removal as well as submerged nuzzles service time increase, which is particularly important at casting of steels with high content of aluminum. Examples of solutions of metal treatment in tundish by cored and aluminum wire given. Schemes of cored wire introduction into tundish and liquid steel treatment in a CCM mold considered. Considerable attention was given to the problem of metal temperature control in tundish, including by an electric arc, induction and plasma heating. List of domestic and foreign plants presented, implemented facilities of steel plasma heating in the CCM tundish. It was noted, that steel chemical heating in tundish can be applied at unforeseen problems arising at casting.


Author(s):  
Magdalena Regel-Rosocka ◽  
Anna Cieszyńska ◽  
Maciej Wiśniewski
Keyword(s):  

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