Reoxidation Behavior of Molten Steel in Tundish.

Abstract

Ja pan.Steel Institute of Japan, It is necessary to clarify the reoxidation factors and quahtitatively determine the contribution of each factor to the reoxidation of the molten steel to prevent the cOntamination in the tundish. In this study, the molten steel in tundish has beensampled in production scale experiment and from the composition changeof the molten steel the amount of reoxidation of the molten steel teemed from the first ladle into an actual tundish has been quantified by factor contents of the molten steel at the tundish inlet remained practically constant and approximately agreed with

State of the Art in Evaluation and Control of Steel Cleanliness.

“…61) Note that oxygen pickup is always many times greater than the measured nitrogen pickup, due to its faster absorption kinetics at the air steel interface. 98) In addition, nitrogen pickup is faster when the oxygen and sulfur contents are low. 54,64) Thus, to reduce nitrogen pickup, deoxidation is best carried out after tapping.…”

Transient Behavior of Inclusions during Reoxidation of Si-killed Stainless Steels in Continuous Casting Tundish

“…Tundish is also known to cause the contamination of the molten steel by a complicated combination of various factors, including entrainment of ladle slag, reaction with tundish cover powders, erosion of refractories, reaction with ladle well packing materials and air absorption. 7,8) Protection of the molten steel in tundish against contamination is of special importance to not only improve steel product quality, but also avoid the clogging of the submerged entry nozzle and correspondingly increase the number of sequence-cast heats. 9) Reoxidation during continuous casting is defined as the reaction of elements in the molten steel and oxygen during pouring of the killed steel from the ladle to the mold.…”

Thermodynamic Model for Prediction of Slag-Steel-Inclusion Reactions of 304 Stainless Steels

“…1,2) Non-metallic inclusions in steel have a detrimental effect on the performance of steels, such as their strength, toughness, fatigability, cleanliness, surface finishing, etc. 3) A wide range of operating approaches including deoxidation, 4,5) calcium treatment, [6][7][8][9][10][11] slag refining, [12][13][14][15][16][17] and prevention against reoxidation [18][19][20][21] are applied throughout the steelmaking processes of stainless steels. Inclusion composition is greatly influenced by the composition of the top slag and the refractory material.…”