Effect of Rare Earth Metals on Sulphide inclusion in Pipeline Steel

Ca, To Duy (1998) Effect of Rare Earth Metals on Sulphide inclusion in Pipeline Steel. In: Non-metallic inclusion in Steels, 1998, NML, Jamshedpur.



The effects of rare earth metal injection treatment on sulphide inclusions of pipeline steel have been studied in the industrial trials. The melt was stirred by nitrogen from the bottom of the ladle. As a result of addition of RE at the rate of 0.05 kg/t improved desulphurization and reduction of sulphur content from 0.03% to 0.012% took place. When RE addition was done from 0.1 to 0.2 kg/t the sulphides and oxysulphides of type lb were formed.Additi-on of 0.1 kg/t of RE resulted in refinement of inclusion size of 1,45.10'2% area below 4μm and only 0.04.102%area over 10 μm. The lowest reduction of sulphide quantity in steel (0.63.10%area) and the elongation ratio of sulphi-des below 7 was obtained after addition of RE of 0.03kg/t. The small-smooth globular inclusions of type lb were undeformed during rolling pipe.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:http://eprints.nmlindia.org/3248
Uncontrolled Keywords:Desulphurization, Elongated ratio
Divisions:Corrosion and Surface Engineering
ID Code:3248
Deposited By:Sahu A K
Deposited On:11 Jul 2011 15:04
Last Modified:01 Dec 2011 15:10
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