Hydrogen Variation in Molten Steel during LF Refining

2011 ◽  
Vol 695 ◽  
pp. 353-356
Author(s):  
Jian Tao Ju ◽  
Zhen Lin Lu ◽  
Min Juan Zhang ◽  
Zhao Hui Zhang ◽  
Jun Yang
Keyword(s):  
Molten Steel ◽  
Hydrogen Content ◽  
Refining Process ◽  
Ladle Furnace ◽  
Regular Pattern ◽  
Refining Slag ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Submerged Arc ◽  
Lf Refining

The hydrogen content was measured by HYDRIS hydrogen analyzer during ladle furnace (LF) refining process aiming to test the regular pattern of hydrogen variation in molten steel. The results showed that the hydrogen increased during temperature rising, Ca-treatment and soft blowing argon period, and the absolute increment were 0.64 ppm and 0.46 ppm respectively. The water in refining slag and submerged arc slag led to hydrogen increase during temperature rising period, and fast wire-feeding speed led to hydrogen increase during Ca-treatment and soft argon blowing period. In addition, during the desulfuration and alloying period, excessive large argon blowing caused the hydrogen content increasing by 0.22 ppm.

scholarly journals Effect of Na2O and Rb2O on Inclusion Removal in C96V Saw Wire Steels Using Low-Basicity LF (Ladle Furnace) Refining Slags

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 691 ◽  
Author(s):  
Changyong Chen ◽  
Zhouhua Jiang ◽  
Yang Li ◽  
Meng Sun ◽  
Kui Chen ◽  
...  
Keyword(s):  
Melting Zone ◽  
Refining Process ◽  
Ladle Furnace ◽  
Refining Slag ◽  
Dramatic Decrease ◽  
Inclusion Removal ◽  
Wire Steel ◽  
Al2o3 Inclusion ◽  
Lf Refining ◽  
Slag Entrapment

Inclusion removal and modification of C96V saw wire steel using Na2O- and Rb2O- containing novel low-basicity LF (ladle furnace) Refining Slags have been researched. The results indicated that the addition of Na2O deteriorates inclusion removal; by contrast, the addition of Rb2O seems to significantly enhance inclusion removal. In detail, Rb2O can improve the cleanliness in the as-quenched C96V saw wire steel melts compared to preexisting synthetic LF refining slag compositions: (i) The average inclusion diameter experienced a remarkable decrease after reaction between the liquid steel and the synthetic LF refining slag; (ii) In addition, the number of inclusions also suffered from a dramatic decrease, with the reaction time increasing from 900 to 2700 s (15 to 45 min); (iii) Furthermore, both of the MnO-SiO2-Al2O3 and CaO-SiO2-Al2O3 inclusion system mainly concentrated in the low melting zone when the composition of Rb2O in synthetic refining slag was ≥5.0 wt%. This is mainly because Na2O significantly reduces the viscosity of refining slag, while Rb2O increases it. Then, there are two remarkable influences causing the increase of viscosity of refining slag with the addition of Rb2O: the inclusions can be sufficiently entrained within the slag once absorbed due to the significant increase in the viscosity; and the slag entrapment during refining process weakened dramatically.

The Introduction of the LF Refining Function and Process

2014 ◽  
Vol 651-653 ◽  
pp. 181-184
Author(s):  
Xiao Lei Zhou ◽  
Zhe Shi ◽  
Gui Fang Zhang ◽  
Yue Hua Ding ◽  
Xiao Yuan Yang
Keyword(s):  
Graphite Electrode ◽  
Ladle Furnace ◽  
Vacuum Equipment ◽  
Slag Refining ◽  
Investment Cost ◽  
Reductive Atmosphere ◽  
Arc Heating ◽  
Flexible Operation ◽  
Submerged Arc ◽  
Lf Refining

The process of LF Refining is introduced in this paper.The LF method is a ladle without vacuum equipment can arc refining method.Because the LF ladle furnace has the advantages of simple equipment, low investment cost, flexible operation and excellent refined effect, are widely used and developed in many countries.The argon is blown from the bottom of the ladle, and molten steel is heated by the graphite electrode, so the purpose of refiningis achieved. The argon stirring can accelerate the chemical reaction between slag and steel.LF refining function includes reductive atmosphere, submerged arc heating, argon stirring and white slag refining.

Droplet transfer behavior of narrow gap laser wire filling welding

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940045 ◽  
Author(s):  
Z. Zhang ◽  
R. Wang ◽  
G. Gou ◽  
H. Chen ◽  
W. Gao
Keyword(s):  
Welding Speed ◽  
High Speed ◽  
Transition Period ◽  
High Speed Photography ◽  
Narrow Gap ◽  
Droplet Transfer ◽  
Transfer Behavior ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Droplet Transition

In this paper, we study the droplet transition behavior of narrow gap laser wire filling welding under the condition of changing welding speed and wire feeding speed, and it was observed by high-speed photography. It was found that with the increase of welding speed, the frequency of droplet transfer was reduced and the transition period was prolonged. With the increase of wire feeding speed, the wire was not fully melted and finally inserted into the molten pool.

Effect of slag basicity adjusting on inclusions in tire cord steels during ladle furnace refining process

2017 ◽  
Vol 114 (6) ◽  
pp. 602 ◽  
Author(s):  
Changbo Guo ◽  
Haitao Ling ◽  
Lifeng Zhang ◽  
Wen Yang ◽  
Ying Ren ◽  
...  
Keyword(s):  
Refining Process ◽  
Slag Basicity ◽  
Ladle Furnace ◽  
Tire Cord
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