The Effect of a High Al Content on the Variation of the Total Oxygen Content in the Steel Melt during a Secondary Refining Process

2017 ◽  
Vol 89 (2) ◽  
pp. 1700287 ◽  
Author(s):  
Takanori Yoshioka ◽  
Takahiro Ideguchi ◽  
Andrey Karasev ◽  
Yasuhide Ohba ◽  
Pär Göran Jönsson
Keyword(s):  
Oxygen Content ◽  
Refining Process ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Al Content ◽  
Secondary Refining ◽  
High Al Content

Formation and Control of Inclusions during Steelmaking Process

2011 ◽  
Vol 52-54 ◽  
pp. 1681-1686 ◽  
Author(s):  
Yang Li ◽  
Zhou Hua Jiang ◽  
Shi You Yin ◽  
Ying Zhuang ◽  
Ming Li
Keyword(s):  
Oxygen Content ◽  
Bearing Steel ◽  
Spring Steel ◽  
Refining Process ◽  
Steelmaking Process ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Oxide Inclusions ◽  
Deoxidation Process ◽  
Lf Refining

The variation of non-metallic inclusions and total oxygen contents in different steel grades were investigated by taking samples in steelmaking process, including gear steel, anchor chain steel, hard wire steel, bearing steel and spring steel. The inclusions mainly were Al2O3, MnS, and their composite inclusions in aluminum killed steel at the beginning of LF refining due to addition of FeAl alloy during the tapping from EAF and feeding of Al wire in LF process, and then Al2O3 inclusion changed to the Al2O3 - CaO composite inclusions after feeding of SiCa wire. The inclusions at the beginning of LF refining mainly were MnS, SiC and their composite inclusions in non-aluminum killed steel due to addition of the composite deoxidation and slagging agents (mainly including CaC2 and SiC) when EAF taping, while the inclusions in tundish mainly were MnS, CaO - SiO2 - Al2O3 composite oxide - sulfide inclusions. It is showed that the inclusions in bearing steel and spring steel samples were mainly globular oxide inclusions and silicate inclusions with higher rated results. Therefore, the refining process should be improved to remove globular oxide inclusions. The inclusions in molten steel were controlled by enhancing the diffusion deoxidation process, adjusting and controlling the basicity and composition of refining slags, respectively, and satisfactory results were obtained. The industrial test shows that the total oxygen content of the aluminum killed steel in the test heat after feeding wire reached the minimum value, which indicates that the optimized slag has a strong ability of absorbing Al2O3 inclusions. For non-aluminum killed steel, the total oxygen content was 0.0027 % to 0.0029 % in rolled products. The inclusions in the end of refining and rolled product were small and dispersed composite inclusions, and the separate Al2O3 inclusions can not be found in the non-aluminum killed steel after optimization of the refining process.

Refining Total Oxygen Content in the Solid Soil Phase

2019 ◽  
Vol 74 (3) ◽  
pp. 99-104
Author(s):  
Yu. N. Vodyanitskii ◽  
A. T. Savichev
Keyword(s):  
Oxygen Content ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Solid Soil

Cavity Formation in Iron Oxide

CORROSION ◽  
1958 ◽  
Vol 14 (1) ◽  
pp. 57-64 ◽  
Author(s):  
D. W. JUENKER ◽  
R. A. MEUSSNER ◽  
C. E. BIRCHENALL
Keyword(s):  
Iron Oxide ◽  
Oxygen Content ◽  
High Temperatures ◽  
Diffusion Path ◽  
Deep Oxidation ◽  
Oxygen Atmosphere ◽  
Cavity Formation ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Scale Thickness

Abstract A study is made of the deep oxidation of iron at high temperatures and in an oxygen atmosphere. Large cavities are always found in specimens whose total oxygen content has been brought to that of FeO. The scale thickness of such specimens, along with other evidence, implies that FeO is plastic in the temperature range in which it is stable, while one or both of the higher oxides is relatively rigid. Evidence is presented which indicates that iron is transported to its surrounding scale with little or no body diffusion path; the mechanism involved is not identified. An expression, analogous to the parabolic rate law for scaling of plane specimens, is developed for application to cylindrical geometry. 3.2.3

Analysis of Micro Inclusions in Q195 Steel

2014 ◽  
Vol 540 ◽  
pp. 68-71
Author(s):  
Shuo Ming Wang ◽  
Yan Wang ◽  
Ruo Si Wang
Keyword(s):  
Production Process ◽  
Oxygen Content ◽  
System Analysis ◽  
Steel Production ◽  
Average Content ◽  
Steel Mill ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Steel Quality ◽  
Transient Casting

Aimed at the Q195 steel production process in a steel mill, using tracer analysis make system analysis to the process of production and microscopic inclusions content. In the steady casting average T[O] is 117.22ppm, [N] is 22.6ppm, micro inclusions average content is 11.96/mm2, while the average T[O] and [N] in transient casting billet is 161.93ppm and 30.49ppm, micro inclusions averaged content is 16.068/mm2. The total oxygen content in steel on the high side, should strengthen deoxidization. Argon stirring strength is too large, inclusions in casting slab containing tracer element, illustrate the ladle slag, tundish slag, mould protection slag are forming pollution on billet, should reduce the influence of transient casting on the steel quality.

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