Secondary Steel Refining for Continuous Sequence Bloom Casting for High Oxide Cleanness Final Products

2012 ◽  
Vol 57 (1) ◽  
pp. 347-353 ◽  
Author(s):  
B. Zdonek ◽  
I. Szypuła ◽  
J. Kozłowski ◽  
S. Szczęch
Keyword(s):  
Continuous Casting ◽  
Oxygen Content ◽  
Equivalent Diameter ◽  
Process Technology ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Continuous Sequence ◽  
Metallic Inclusions ◽  
Steel Refining ◽  
Inclusions In Steel

Secondary Steel Refining for Continuous Sequence Bloom Casting for High Oxide Cleanness Final ProductsSteelmaking and secondary refining process technology of resulphurized liquid steel with low content of total oxygen, assigned for continuous casting of strands for rolled and forged products for automotive industry was developed. The influence of secondary steel refining parameters on total oxygen content as well as amount and morphology of non-metallic inclusions was examined. It was found, that content of total oxygen and amount of non-metallic inclusions in steel decrease as steel refining time in the ladle becomes longer, and the chemical composition of non-metallic inclusions in steel changes from modified calcium aluminates to spinel inclusion of CaO·Al2O3·MgO type. The total oxygen content in steel from continuous casting in four cast sequence ranged from 6 to 25 ppm, with percentage share of non-metallic inclusions from 0.09 to 0.30 per cent and equivalent diameter 0.78 to 1.59 μm.

Application of Al-Mg Alloy in Bearing Steel

2009 ◽  
Vol 620-622 ◽  
pp. 387-390 ◽  
Author(s):  
Wei Gong ◽  
Zhou Hua Jiang ◽  
Dong Ping Zhan
Keyword(s):  
Oxygen Content ◽  
Spherical Shape ◽  
Inclusion Size ◽  
Bearing Steel ◽  
Mg Alloy ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Alumina Inclusion ◽  
Inclusion Modification ◽  
Inclusions In Steel

There is less study about the effect of magnesium on characteristics of bearing. In the paper, the bearing steel was modified by three types of Al-Mg alloys. Firstly, the total oxygen content value was measured, and then the inclusion size, shape and chemical composition were analyzed by optical microscopy, SEM and EDX. The results show that, after treated by Al-Mg alloy, the total oxygen content descends remarkably and the alumina inclusion with big size and different shapes transform into spinel with small size and spherical shape. The optimal effect of inclusion modification is acquired after treated by NO. 3 Al-Mg alloy containing 16.55 wt% Mg, most of the inclusions in steel are spinel and magnesia, and the size of 96.23 wt% inclusions is less than 3μm.

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.

Cleaness of the First Pipeline Steel Slab along with Casting Direction

2012 ◽  
Vol 567 ◽  
pp. 10-14
Author(s):  
Jian Huang ◽  
Yi Min ◽  
Cheng Jun Liu ◽  
Mao Fa Jiang
Keyword(s):  
Continuous Casting ◽  
Casting Speed ◽  
Degradation Rate ◽  
Pipeline Steel ◽  
Areal Density ◽  
Total Oxygen ◽  
Steel Slab ◽  
Metallic Inclusions ◽  
Mold Powders ◽  
Casting Length

To improve the quality controlling of pipeline steel and to avoid mis-down grade, the cleaness including content of non-metallic inclusions, total oxygen and nitrogen of the first continuous casting slags of X70 pipeline steel were investigated. Results showed that, content of total oxygen, nitrogen, large non-metallic inclusions and inclusions areal density decrease with casting length increasing gradually. But at casting length of about 5.0 m which is just during the drastic changeing period of casting speed approaching to stead casting state, the content of large non-metallic inclusions and inclusions areal density increases abruptly induced by the entrapment of mold powders. Thus, to decrease the degradation rate of pipeline slab, the increasing rate of casting speed should be adjusted more evenly.

Investigation of Formation Features of Sulphide Inclusions and their Distribution inside the Grain Depending upon the Conditions of Steel 20 Deoxidation

2019 ◽  
Vol 945 ◽  
pp. 592-597
Author(s):  
S.B. Gamanyuk ◽  
M.V. Kirilichev ◽  
G.V. Babin
Keyword(s):  
Oxygen Content ◽  
Plastic Properties ◽  
Oxidation Level ◽  
Metallic Inclusions ◽  
Distribution Features ◽  
Steel Oxidation ◽  
Negative Effect ◽  
Steel 20 ◽  
The Impact ◽  
Inclusions In Steel

The paper reports laboratory test findings on the impact of steel oxidation level on distribution features of non-metallic inclusions in low-alloyed structural steels. An analysis of the effect of various oxidation methods of steel on the distribution and formation of non-metallic inclusions is made. The results reveal a relation between the amount of sulphide and oxisulphide inclusions formed and steel oxidation level. The release of oxisulphide from the melt is accompanied with a decrease in the amount of both oxygen and sulphur. After oxygen content has achieved an equilibrium value, only “pure” sulphides are formed, which may deteriorate steel plastic properties. Thus, sulphides start precipitating only when oxygen content in the melt falls to a very low value. An increase in the amount of oxysulphides is accompanied with a decrease in sulphur concentration in the melt which reduces sulphide phase concentration at grain boundaries and stabilizes plastic properties. Thus the negative effect of sulphur can be reduced not only by decreasing its content in steel through expensive secondary steelmaking methods but also by controling the amount, shape and types of oxide, sulphide and oxisulphide inclusions in steel.

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