Influence of Ultrasonic Wave, Argon Blowing and its Coordinated Treatment on the Nitrogen Content in Low Carbon Steel

Influence of ultrasonic wave, argon blowing agitating and their coordinated treatment on nitrogen content in low carbon steel was mainly studied. Results showed that ultrasonic wave, argon blowing or their coordinated treatment can all reduce the nitrogen content in low carbon molten steel. While treated with ultrasonic wave separately, removal rate of the nitrogen in molten steel is relatively low with 3.13%~9.04%. Using the argon blowing agitating separately, removal rate of the nitrogen in molten steel is relatively high with 6.89%~32.68%, when the argon blowing flow is 0.5 l/min, removal rate of nitrogen is 32.68%. The nitrogen removal effect of the ultrasonic wave-argon blowing agitating coordinated treatment is considerably improved than that of separately ultrasonic treatment. While 300 W ultrasonic wave and 0.5l/min argon blowing agitating cooperatively treatment on the low carbon molten steel, the removal rate of nitrogen is 26.95%.

Download Full-text

Effect of Ultrasonic and Argon-Blowing Treatment on the Nitrogen Content in Low Carbon Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1281 ◽

2012 ◽

Vol 476-478 ◽

pp. 1281-1286

Author(s):

Jie Li ◽

Cheng Ling Ge ◽

Ling Li

Keyword(s):

Carbon Steel ◽

Nitrogen Content ◽

Molten Steel ◽

Treatment Time ◽

Removal Rate ◽

Low Carbon Steel ◽

Processing Method ◽

Low Carbon ◽

Argon Flow Rate ◽

Argon Flow

The processing method for introducing an ultrasonic wave probe directly inserted into the molten steel was used. Effect of ultrasonic and argon-blowing on the nitrogen content in low carbon steel was carried out. The results showed that with the ultrasonic treatment separately, the nitrogen content in the molten steel reduced, but the removal rate was relatively lower with about 3.13~9.04 %. Using the argon-blowing agitation separately, the removal rate of nitrogen in the steel was relatively higher with about 6.89~32.68 %. With the increase of argon flow rate and prolong of the treatment time, the removal rate of nitrogen in the molten steel trended to increase at first, and then reduce.

Download Full-text

Improvement of Low Carbon Steel Properties through V-N Microalloying

Materials Science Forum ◽

10.4028/www.scientific.net/msf.500-501.503 ◽

2005 ◽

Vol 500-501 ◽

pp. 503-510 ◽

Cited By ~ 2

Author(s):

Ibrahim Hamed M. Ali ◽

Ibrahim M. Moustafa ◽

Ahmed Mohamed Farid ◽

R.J. Glodowski

Keyword(s):

Mechanical Properties ◽

Carbon Steel ◽

Nitrogen Content ◽

Low Carbon Steel ◽

Nitrogen Addition ◽

Strength Properties ◽

Vanadium Content ◽

Low Carbon ◽

Steel Properties ◽

Low Solubility

To improve the strength properties of vanadium bearing low carbon steel, nitrogen is often added to the liquid steel. The source of the nitrogen addition can be in many different forms. The recovery of nitrogen from the addition is variable due to the low solubility of nitrogen in steel. In this work, nitrogen-enriched alloy (Nitrovan) was added under open atmosphere. To deduce the nitrogen role, two alloys were chosen that having the same vanadium content. One of them was Ferro-Vanadium as a source of vanadium, whereas Nitro-Vanadium used as a source of vanadium and nitrogen. Ferro-vanadium as well as Nitro-vanadium was added separately in the ladle after completely melting of carbon steel and proper superheat using 100 Kg induction furnace. The effect of adding nitrogen-enriched alloy on mechanical properties of the steel was investigated. For this purpose, four heats were produced and cast into sand moulds. The general trend of results shows higher mechanical properties through increasing nitrogen content. The experimental work indicates that enhanced nitrogen content promotes the precipitation of V(C,N) and decreases the particles size of V(C,N) precipitates. Also, under the same level of vanadium content, the tensile strength and yield strength of the nitrogen-enhanced steels increases consistently compared to the steels added 80% Ferro-Vanadium. An empirical formula, correlating the mechanical properties of the steel and its composition, was obtained.

Download Full-text

Effects of Ultrasonic Treatment during the Solidification Process on the Structure Formation of Low Carbon Steel

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.m2011091 ◽

2011 ◽

Vol 52 (9) ◽

pp. 1844-1847 ◽

Cited By ~ 7

Author(s):

W. Kong ◽

D. Q. Cang ◽

J. H. Song

Keyword(s):

Carbon Steel ◽

Structure Formation ◽

Ultrasonic Treatment ◽

Low Carbon Steel ◽

Solidification Process ◽

Low Carbon

Download Full-text

Objective Laws of Nitrogen Removal in the Vacuum Tank Degasser

Materials Science Forum ◽

10.4028/www.scientific.net/msf.989.381 ◽

2020 ◽

Vol 989 ◽

pp. 381-387

Author(s):

Vlasta D. Tutarova ◽

Alexey N. Shapovalov ◽

Alexander N. Kalitaev

Keyword(s):

Nitrogen Content ◽

Nitrogen Removal ◽

Low Carbon Steel ◽

Regression Equations ◽

Low Carbon ◽

Efficient Removal ◽

Vacuum Degassing ◽

Rational Combination ◽

Steel Grades ◽

Steel Treatment

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.

Download Full-text