scholarly journals Scale Formation on HSLA Steel during Continuous Casting Part I: The Effect of Temperature–Time on Oxidation Kinetics

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1243 ◽  
Author(s):  
Rosa Maria Pineda Huitron ◽  
Pavel Ernesto Ramírez López ◽  
Esa Vuorinen ◽  
Pooria Nazen Jalali ◽  
Leonardo Pelcastre ◽  
...  
Keyword(s):  
Water Vapor ◽  
Continuous Casting ◽  
Oxide Scale ◽  
Surface Quality ◽  
Hsla Steel ◽  
Effect Of Temperature ◽  
Dry Air ◽  
Oxidation Rates ◽  
Steel Slabs

The findings in this work enhance the understanding of oxidation mechanisms and scale growth at high temperatures of a high strength low alloy (HSLA) steel for improving surface quality during continuous casting. The oxidation phenomenon was investigated under dry air and water vapor atmospheres by heating specimens at 1000, 1100, and 1200 °C at different holding times. Temperature and time had great effects on the kinetics, where faster (i.e., parabolic) oxidation rates were present under water vapor when compared with the dry air condition. Temperature strongly influenced the number of defects, such as pores, voids, gaps and micro-cracks, formed in the oxide scale. A phase analysis confirmed the presence of FeO as the first phase formed at the steel surface, Fe3O4 as the middle and thicker phase, and Fe2O3 as the last phase formed in the oxide/air interface. The micromechanics of the oxides demonstrated that a combination of phases with high (wüstite) and low plasticity (magnetite and hematite) could also have been the reason for the uneven cooling during Continuous Casting (CC) that resulted in the undesired surface quality of the steel slabs. This work gives a good look at the oxide scale effect on the surface quality of steel slabs through an understanding the kinetics during oxidation.

scholarly journals Control of Surface Quality of 0.08%

1996 ◽  
Vol 36 (Suppl) ◽  
pp. S227-S230 ◽  
Author(s):  
Vincent Guyot ◽  
Jean-François Martin ◽  
Alain Ruelle ◽  
Amaury d'Anselme ◽  
Jean-Paul Radot ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Surface Quality ◽  
Steel Slabs

Experimental study on surface quality of silicon ingots prepared by electromagnetic continuous casting

2012 ◽  
Vol 15 (4) ◽  
pp. 340-346 ◽  
Author(s):  
Feng Huang ◽  
Ruirun Chen ◽  
Jingjie Guo ◽  
Hongsheng Ding ◽  
Yanqing Su ◽  
...  
Keyword(s):  
Experimental Study ◽  
Continuous Casting ◽  
Surface Quality ◽  
Electromagnetic Continuous Casting

scholarly journals External Surface Quality of the Graphite Crystallizer as a Factor Influencing the Temperature of the Continuous Casting Process of ETP Grade Copper

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6309
Author(s):  
Paweł Kwaśniewski ◽  
Paweł Strzępek ◽  
Grzegorz Kiesiewicz ◽  
Szymon Kordaszewski ◽  
Krystian Franczak ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Surface Quality ◽  
External Surface ◽  
Cooling System ◽  
Casting Process ◽  
Electrical Energy ◽  
Wire Drawing ◽  
Roughness Coefficient ◽  
Continuous Casting Process

Today’s world is a place where lack of electrical energy would be unimaginable for most of society. All the conductors in the world, both aluminum and copper, have their origin in various types of casting lines where the liquid metal after crystallization is being processed into the form of wires and microwires. However, the efficiency of the continuous casting processes of metals and the final quality of the manufactured product strictly depend on the design of the used crystallizers, the materials used during its production and its quality. Research conducted in this paper focuses on the latter, i.e., external surface quality of the graphite crystallizer at the place of contact with the primary cooling system. In order to quantify its influence on the continuous casting process numerical analyses using the finite element method has been conducted, which results have been further confirmed during empirical tests in laboratory conditions. It has been proven with all of the proposed methods that the temperature of the obtained cast rod is closely linked to the aforementioned surface quality, as when its roughness coefficient surpasses a certain value the temperature of the obtained product increases almost twofold from approx. 150–170 °C to 300–320 °C. These values might influence the quality and final properties of the cast rod, the susceptibility to wire drawing process and possible formation of wire drawing defects and therefore be of much importance to the casting and processing industry.

scholarly journals Effect of Oxide Scale on Hot Dip Zn-Al-Mg Alloy Coating Prepared by Reduction Combined with Induction Heating

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1519
Author(s):  
Yijie Zhang ◽  
Minyun Xu ◽  
Ruina Ma ◽  
An Du ◽  
Yongzhe Fan ◽  
...  
Keyword(s):  
Oxide Scale ◽  
Surface Quality ◽  
Induction Heating ◽  
Ternary Eutectic ◽  
Alloy Coating ◽  
Eutectic Structure ◽  
Scale Thickness ◽  
Rapid Induction ◽  
Fe4al13 Phase

Hot dipping Zn-Al-Mg coatings were prepared by rapid induction heating combined with gas protection. The influence of oxide scale on the structure and surface quality of a hot-dip Zn-6Al-3Mg alloy coating was studied in this paper. The results showed that the reaction of Fe-Al was suppressed by the scale on the surface of the steel plate. When the thickness of scale was 10 μm and the steel entry temperature was 900 °C, the surface quality of the coating was good. The Zn-Al-Mg coatings mainly consisted of the ternary eutectic structure of Zn/Al/MgZn2 and Fe4Al13 at the interface. When the scale thickness was 2–3 μm with the same steel entry temperature, the surface quality of the coating was poor, and serious stripe-like protrusion defects were formed on the surface of the coating, which was mainly caused by the Fe4Al13 phase separating from the substrate / coating interface into the overlay.

scholarly journals Continuous Casting and Rolling Technology at MKM Mansfelder Kupfer und Messing GmbH – Optimisation of the Surface Quality for Conti-M® Strip

2016 ◽  
Vol 854 ◽  
pp. 255-259
Author(s):  
Klaus Dieter Palm ◽  
Hendrik Busch ◽  
Axel Dusdorf
Keyword(s):  
Control System ◽  
Continuous Casting ◽  
Surface Quality ◽  
Rolling Process ◽  
Process Control System ◽  
Quality Development ◽  
The Impact ◽  
Rolling Technology ◽  
Process Product

Using Conti-M® which is a globally unique technology for producing cast-rolled copper strips, MKM has been able to link and optimise the continuous casting and rolling process together with the surface quality of milled strips. The last 15 years have seen many targeted projects for process, product and quality development. In this article, the process related challenges to optimise the surface quality of casting strip will be highlighted. We will present a process control system and the impact it had in the optimisation of the surface quality.

scholarly journals Influence of Water Vapor and Temperature on the Oxide Scale Growth and Alpha-Case Formation in Ti-6Al-4V Alloy

2021 ◽  
Author(s):  
B. Öztürk ◽  
L. Mengis ◽  
D. Dickes ◽  
U. Glatzel ◽  
M. C. Galetz
Keyword(s):  
Water Vapor ◽  
Oxide Scale ◽  
Oxidation Behavior ◽  
Subsurface Layer ◽  
Oxygen Enrichment ◽  
Oxide Morphology ◽  
Dry Air ◽  
Subsurface Zone ◽  
Alpha Case ◽  
Influence Of Water

AbstractThe Ti-6Al-4V alloy is extensively used in aerospace, automotive and biomaterial applications. In the aerospace industry, the service temperature of Ti-6Al-4V is currently limited to 350 °C due to its insufficient oxidation resistance. Oxidation at higher temperatures causes the formation of a fast-growing oxide scale and an oxygen-enriched subsurface layer, which is known as the “alpha-case.” Additionally, the effect of water vapor on the oxidation behavior is critical. In the present study, the oxidation behavior of Ti-6Al-4V in dry air and air containing 10 vol.% H2O at 500, 600 and 700 °C for up to 500 h has been investigated. The main focus of this study is the examination of the different oxide scale morphologies along with the oxygen enrichment in the subsurface zone. It has been observed that spallation of the oxide scale is more severe in a water vapor-containing environment. In dry air, the oxide morphology shows the typical layered TiO2/Al2O3 structure after exposure at 700 °C for 300 h, while Al2O3 precipitates are present in the outermost part of the TiO2 scale when oxidized in wet air. This indicates that the solubility and diffusivity of Al3+ ions in TiO2 are influenced by water vapor. In addition, the extent of oxygen enrichment in the subsurface zone (alpha-case) as a function of temperature and time is determined by nanoindentation profiles. It was shown that in contrast to the scale formation, the alpha-case thickness is not affected by the presence of water vapor in the atmosphere.

scholarly journals Construction of Nonsinusoidal Oscillation Waveform Function and Technological Parameters for Continuous Casting Mold

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Chao Zhou ◽  
Xingzhong Zhang ◽  
Fang Wang ◽  
Subo Ren
Keyword(s):  
Continuous Casting ◽  
Surface Quality ◽  
Sinusoidal Oscillation ◽  
Technological Parameters ◽  
Continuous Casting Mold ◽  
Synchronous Control ◽  
Limit Value ◽  
Steel Continuous Casting ◽  
The Impact

Nonsinusoidal oscillation techniques can shorten the negative strip time and improve the slab surface quality in the process of steel continuous casting. But the acceleration of nonsinusoidal oscillation is higher than that of the sinusoidal oscillation. So it is easy to result in the impact for the mold movement. To solve this problem, a nonsinusoidal oscillation waveform function of mold was constructed, which had good dynamic characteristics. And the smaller acceleration can reduce the impact of the oscillator. By analyzing the parameters of oscillation technology, the calculation method of each oscillation technological parameter for seven section functions was presented and the multitechnological parameter curves were given. Based on the technological parameters of sinusoidal oscillation, a synchronous control model of nonsinusoidal oscillation was determined. The results show that the parameters can satisfy the limit value in theory, which can enhance the casting speed, surface quality of slab, and provide reference for further practice in industry.

Sign in / Sign up

Export Citation Format

Share Document