Recent advances in inclusions and central segregation control technology in tyre cord steel and saw wire steel

Chen, Changyong; Wang, Lu; Sun, Meng; Chen, Xiaoqing; Li, Yang

doi:10.1080/03019233.2022.2099697

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…But neither of these two aspects can solve the final problem. We think the most important thing is to reduce the melting point of the inclusion so that it can be softened or even liquid at rolling temperature, with good deformability-that is, the wire of the cord steel can be drawn thinner and continuously [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Na2O, K2O and B2O3 on Deformability of SiO2-MnO-Al2O3 Inclusion in High-Carbon Steel

Zhao

Wang

et al. 2023

Metals

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Cord steel is used for making tire frames and wire saws for cutting silicon wafers. The diameter of mainstream cutting wire has been developed to be lower than 100 μm. The size and deformation ability of inclusions are very important to the wire breaking rate of cord steel during the drawing process. In order to improve the deformation ability of the inclusions in cord steel, alkali metal oxide was added into the molten steel to improve the inclusions in the steel so as to obtain good, plastic, low-melting-point inclusions. Mass fractions of 0.3%, 0.5% and 1.0% K2CO3, Na2CO3 and B2O3 were added into cord steel, which were melted in 10 furnaces (including 0% alkali metal oxides, mass fractions of 0.3%/0.5%/1.0% K2CO3, Na2CO3 and B2O3). The morphology and composition of inclusions were observed by SEM-EDS. Factsage phase diagram calculations and experimental results show that, with the increase in Na2CO3 content in cord steel, the aluminum content in the inclusions gradually decreased. When the mass fraction of Na2CO3 was 0.5% per ton, most of the inclusions in the steel fell in the low melting point region (less than 1300 °C). With the increase in K2CO3 content in cord steel, the silicon content in the inclusions decreased gradually. When the mass fraction of K2CO3 was 0.5% per ton, most of the inclusions in the steel fell in the low melting point region. The deformation ability of the inclusions added with 0.5% Na2CO3 in the steel during forging was better than that of the inclusions added with 0.5% K2CO3. After adding B2O3, the inclusions in the steel were SiO2-MnO-Al2O3 inclusions or inclusions with SiO2-MnO-Al2O3 as the core and BN wrapped around. Boron could not be dissolved into the inclusions for plastic modification.

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Section: Introductionmentioning

confidence: 99%

Effects of Na2O, K2O and B2O3 on Deformability of SiO2-MnO-Al2O3 Inclusion in High-Carbon Steel

Zhao

Wang

et al. 2023

Metals

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Behavior and Mechanism of Inclusion Deformation in Type 430 Stainless Steel During Isothermal Compression

Gan

Liu

et al. 2023

Metall Mater Trans B

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Study on the deformation mechanism of inclusions containing sodium in cord steel

Wang,

Hou

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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Large-sized hard inclusions led to the problem of wire breaking during the cold drawing process. So it is very important to plasticise inclusions in cord steel. In this article, the plastic modification mechanism of Na2CO3 on inclusions in cord steel was studied by adding different contents (0%, 0.2%, 0.4%, 0.6%) Na2CO3 in a MoSi2 resistance furnace. The ingots were forged to investigate the deformability of inclusions. The size of inclusions during the cold drawing was the same as that after forging because the cold drawing was carried out at room temperature. Therefore, the size and deformability of inclusions after forging can be used to measure the wire breaking rate of cord steel wire during the cold drawing process. Through the analysis of ingot samples and forging samples by SEM-EDS, it was found that the deformability of inclusions was improved and the inclusions were in the form of long strips or broken after forging. In addition, not only the low melting point phase diagrams of SiO2–Al2O3–MnO–(15%/10%)CaO–(0%–9%)Na2O but also the activities of SiO2, Al2O3 and MnO were calculated by FactSage8.2. It was found that Na increased the low melting point region. When the contents of [Si], [Mn] and [Al] in molten steel were determined, the values of [Formula: see text] and [Formula: see text] remained constant according to metal-inclusion thermodynamic equilibriums 3SiO2(inc) + 4[Al] = 2Al2O3(inc) + 3[Si] and [Si] + 2MnO(inc) = 2[Mn] + SiO2(inc). Under the condition of constant [Formula: see text] and [Formula: see text], the activity coefficients of SiO2, Al2O3 and MnO were changed by adding Na2O, which led to the change of inclusions component. Therefore, it was obtained the effect of Na2O content on inclusion composition and melting point using FactSage8.2 thermodynamic calculation and low melting point region calculation of phase diagrams. The result was that the inclusion deformability was well improved during thermal deformation under the condition of about 0.4% Na2CO3. Thus the wire breaking rate was reduced. It is expected that this work can provide theoretical guidance for the industrial production of feeding alkali wire in the later stage of refining.

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Recent advances in inclusions and central segregation control technology in tyre cord steel and saw wire steel

Cited by 4 publications

References 42 publications

Effects of Na2O, K2O and B2O3 on Deformability of SiO2-MnO-Al2O3 Inclusion in High-Carbon Steel

Effects of Na2O, K2O and B2O3 on Deformability of SiO2-MnO-Al2O3 Inclusion in High-Carbon Steel

Behavior and Mechanism of Inclusion Deformation in Type 430 Stainless Steel During Isothermal Compression

Study on the deformation mechanism of inclusions containing sodium in cord steel

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