scholarly journals Effect of Mn Content on the Reaction between Fe-xMn (x = 5, 10, 15, and 20 Mass Pct) Steel and CaO-SiO2-Al2O3-MgO Slag

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1200
Author(s):  
Huixiang Yu ◽  
Muming Li ◽  
Jiaming Zhang ◽  
Dexin Yang
Keyword(s):  
Oxygen Content ◽  
Thermodynamic Analysis ◽  
Slag Composition ◽  
Composition Change ◽  
Number Density ◽  
Refining Slag ◽  
Steel Cleanliness ◽  
Mn Content ◽  
Mn Steel ◽  
Top Slag

Medium- and high-Mn steels have excellent properties but are very difficult to be commercially produced because of the high content of some alloy elements. To enhance the understanding of the reaction between medium/high-Mn steel and refining slag which is significantly different from the conventional steels, steel and slag composition and the inclusions were investigated by equilibrium reaction between Fe-xMn (x = 5, 10, 15, and 20 mass pct) and CaO-SiO2-Al2O3-MgO top slag at 1873 K in the laboratory. Furthermore, the effect of Mn content on inclusion transformation and steel cleanliness was also explored. After slag–steel reaction, both contents of MnO in slag and Si in steel increased. Most MnO inclusions in master steel transformed to MnO-SiO2 and MnO-Al2O3-MgO. With the increase in Mn content, the amount share of MnO type inclusions decreased and that of MnO-Al2O3-MgO type increased. In addition, both the number density of observed inclusions and the calculated oxygen content in inclusions increased. Thermodynamic analysis indicates that the composition change of steel and slag and the transformation of inclusions are mainly the consequence of the reaction between Mn in molten steel and SiO2 and MgO in top slag. The dissolved Mn in medium/high-Mn steel presents a strong reactivity.

Metallurgical characteristics of refining slag used for high manganese steel

2019 ◽  
Vol 116 (6) ◽  
pp. 620 ◽  
Author(s):  
Huixiang Yu ◽  
Dexin Yang ◽  
Muming Li ◽  
Ming Pan
Keyword(s):  
Manganese Steel ◽  
Middle Region ◽  
Refining Slag ◽  
Present Experimental Condition ◽  
High Manganese ◽  
High Manganese Steel ◽  
Liquid Zone ◽  
Mn Steel ◽  
Calculated Liquid ◽  
Top Slag

High manganese steel has excellent mechanical properties, which has garnered much attention. Whereas the research on the refining slag used for high Mn steel is very limited. In this study, the metallurgical characteristics of refining slag for high Mn steel were investigated based on thermodynamic calculation with FactSage 6.3 and slag-metal equilibrium reaction in MgO crucible. The calculated liquid zones of T ≤ 1873 K of CaO-SiO2-Al2O3-8%MgO-5%MnO system are located in the middle region of pseudo-ternary CaO-SiO2-Al2O3. For CaO-SiO2-Al2O3-8%MgO-MnO system, the apparent liquid zone at 1873 K enlarges with MnO content in slag increasing, and moves toward the direction of SiO2 and Al2O3 content increasing. For CaO-SiO2-Al2O3-MgO-MnO system, the liquidus zone shrinks with the basicity increasing, and moves toward the direction of Al2O3 content increasing. The measured MnO content in top slag reacted with high Mn steel was much higher than that reacted with conventional steels. In present experiments, the MnO content was around 5% when CaO-SiO2-Al2O3-MgO slag with basicity of 4 was in equilibrium with high Mn steel (Mn = 10, 20%) at 1873 K. The inclusions in master high Mn steel were mainly MnO type. After reaction with top slag, most inclusions transformed to MnO-SiO2 system and MnO-Al2O3-MgO system, in which the MnO content still shared the majority. Thermodynamic calculations show that SiO2 in top slag can be reduced by [Mn] in steel to supply [Si] under present experimental condition, which subsequently reacts with [O] in steel bath to form SiO2.

scholarly journals Effect of Acid Slag Treatment on the Inclusions in GCr15 Bearing Steel

2019 ◽  
Vol 38 (2019) ◽  
pp. 760-766
Author(s):  
Yang Liu ◽  
Jing Li ◽  
Jinpeng Ge ◽  
Dingli Zheng
Keyword(s):  
Spatial Distribution ◽  
Melting Point ◽  
Oxygen Content ◽  
Bearing Steel ◽  
Refining Slag ◽  
Slag Treatment ◽  
Gcr15 Bearing Steel ◽  
Inclusions In Steel

AbstractBy laboratory slag/steel reaction equilibrim experiments, the viriation of oxygen content, inclusion compositions and inclusion sizes were studied. The effect of acid slag treatment on the transition mechanisms of D-type inclusions and the precipitation of TiN inclusions in GCr15 bearing steel were explored. The obtained results showed that the dominant inclusions in steel were plastic and smaller Al2O3-SiO2-MnO. The melting point were lower than 1400°C treated by the acid refining slag of 35.1%CaO-15%Al2O3-43.9%SiO2-6%MgO and there was no TiN found. The evolution of MgO·Al2O3 inclusions is: MgO·Al2O3→ MgO·Al2O3·SiO2·MnO→ Al2O3·SiO2·MnO. Mg and Al from MgO·Al2O3 inclusions were displaced by [Si] and [Mn] in steel liquid , and formation of plastic Al2O3-SiO2-MnO inclusions finally, whose compositions distribution were uniform. Mg and Si, Mn were complementary in inclusions as to the spatial distribution.

Mechanism of Slag Composition Change During Electroslag Remelting Process

2011 ◽  
Vol 18 (10) ◽  
pp. 24-28 ◽  
Author(s):  
Jun-xue Zhao ◽  
Yan-mei Chen ◽  
Xiao-ming Li ◽  
Ya-ru Cui ◽  
Xiao-tao Lu
Keyword(s):  
Slag Composition ◽  
Electroslag Remelting ◽  
Composition Change

Thermodynamic Research of Inclusion Forming in FeSiB Alloy Based on Energy Materials

2012 ◽  
Vol 577 ◽  
pp. 43-46
Author(s):  
Ding Guo Zhao ◽  
Xiao Jie Cui ◽  
Shu Huan Wang ◽  
He Jun Zhang
Keyword(s):  
Nitrogen Content ◽  
Energy Saving ◽  
Oxygen Content ◽  
Thermodynamic Analysis ◽  
Master Alloy ◽  
Energy Materials

The thermodynamic analysis shown that oxygen content in master alloy is very low, so other alloy elements content which are balance to oxygen are relatively high. In the amorphous master alloy, deoxidizing capacity of silicon is stronger than boron, and with process of decrease of the temperature, oxygen content decrease. The silicon in the master alloy can also take off the oxygen content below 1 ppm. Denitrification capacity of boron is stronger than silicon, and with process of decrease of the temperature, nitrogen content decrease. The boron in the master alloy can also take off the nitrogen content below 4 ppm. All of the research are based on energy materials and it will be useful for the development for energy saving.

Effect of slag composition on steel cleanliness in interstitial-free steel

2017 ◽  
Vol 24 (6) ◽  
pp. 579-585 ◽  
Author(s):  
Rui Wang ◽  
Yan-ping Bao ◽  
Yi-hong Li ◽  
Tai-quan Li ◽  
Di Chen
Keyword(s):  
Slag Composition ◽  
Interstitial Free ◽  
Interstitial Free Steel ◽  
Steel Cleanliness

scholarly journals Effect of Dew Point and Alloy Composition on Reactive Wetting of Hot Dip Galvanized Medium Manganese Lightweight Steel

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 37 ◽  
Author(s):  
Tong Yang ◽  
Yanlin He ◽  
Zhang Chen ◽  
Weisen Zheng ◽  
Hua Wang ◽  
...  
Keyword(s):  
Alloy Composition ◽  
Dew Point ◽  
Reactive Wetting ◽  
Application Development ◽  
Lightweight Steel ◽  
Unstable Phase ◽  
Medium Mn Steel ◽  
Mn Content ◽  
Mn Steel

For its application development, the medium manganese lightweight steel with 3 wt.% and 10 wt.% Mn contents was galvanized in continuous hot dip galvanizing (HDG) simulator and the process parameters on the production line were adopted. Combined with the experimental analysis and thermodynamic calculation, the effect of dew point and alloy composition on the reactive wetting of the steel was investigated. It was shown that MnO existed as a stable oxide for the medium Mn steel with 5 wt.% Al as long as Mn content exceeded 5.1 wt.%. The galvanizability of the steel with 10 wt.% Mn was deteriorated resulting from the formation of a thick and continuous external MnO layer, which had adverse effects on the wettability. MnO particles in the form of unstable phase can be found at the surface of 3Mn steel galvanized at dew point +10 °C. It distributed sparsely and the reactive wettability can be obtained by “bridging connection”, which mitigated the damage of external oxidation. Moreover, the lower dew point, the less tendency to form external oxide. Although the decrease of dew point to −30 °C had a certain benefit for coating quality, the galvanizing quality of 10Mn steel could not be improved due to the formation of a thick MnO layer. Therefore, the Mn content played a stronger role than dew point on the reactive wetting of hot dip galvanized medium manganese lightweight steel.

Effect of refining slag containing Ce2O3 on steel cleanliness

2011 ◽  
Vol 29 (11) ◽  
pp. 1079-1083 ◽  
Author(s):  
Xiaohong YANG ◽  
Hu LONG ◽  
Guoguang CHENG ◽  
Chengchuan WU ◽  
Bin WU
Keyword(s):  
Refining Slag ◽  
Steel Cleanliness

Effects of Mn and Al on the Intragranular Acicular Ferrite Formation in Rare Earth Treated C–Mn Steel

2017 ◽  
Vol 36 (7) ◽  
pp. 683-691 ◽  
Author(s):  
Mingming Song ◽  
Bo Song ◽  
Zhanbing Yang ◽  
Shenghua Zhang ◽  
Chunlin Hu
Keyword(s):  
Rare Earth ◽  
Acicular Ferrite ◽  
Lattice Misfit ◽  
Ferrite Formation ◽  
Al Content ◽  
Bainite Structure ◽  
Mn Content ◽  
Intragranular Acicular Ferrite ◽  
Upper Bainite ◽  
Mn Steel

AbstractThe influence of Al, Mn and rare earth (RE) on microstructure of C–Mn steel was investigated. The capacities of different RE inclusions to induce intragranular acicular ferrite (AF) formation were compared. Result shows that RE treatment could make C–Mn steel from large amounts of intragranular AF. Al killed is detrimental to the formation of intragranular AF in RE-treated C–Mn steel. An upper bainite structure would replace the AF when Al content increased to 0.027 mass %. The optimal Mn content to form AF is about 0.75–1.31 mass %. The effective RE inclusion which could induce AF nucleation is La2O2S. When patches of MnS are attached on the surface of La2O2S inclusion, AF nucleation capacity of RE-containing inclusion could enlarge obviously. The existence of manganese-depleted zone and low lattice misfit would be the main reason of La-containing inclusion inducing AF nucleation in C–Mn steel.

Smelting Cleaness Control of Supercritical Rotor Steel 30Cr2Ni4MoV

2012 ◽  
Vol 476-478 ◽  
pp. 199-204
Author(s):  
Teng Chang Lin ◽  
Rong Zhu ◽  
Wei Xing ◽  
Xin Zhou ◽  
Wen Juan Liu ◽  
...  
Keyword(s):  
Melting Point ◽  
Chemical Analysis ◽  
Flow Field ◽  
Carbon Content ◽  
Oxygen Content ◽  
Smelting Process ◽  
Good Effect ◽  
Rotor Steel ◽  
Steel Cleanliness ◽  
Nitrogen Contents

The cleanness of 30Cr2Ni4MoV steel was researched by chemical analysis, SEM and electrolytic experiment. The results show that the large-sized inclusions in the casting is the direct reason for the product to scrap. It found that there is a increase trend of large-sized inclusions and oxygen content from VD to pouring process with a cleanness detection of smelting process. It have achieved a good effect by adopting some measures to improve steel cleanliness which includes controlling the carbon content of EAF tapping reasonablly, low melting point controlling of inclusions, extending soft blow time and optimizing the flow field of tundish. The quantity of inclusions has reduced from 38.8 per square millimeter to 16.0 per square millimeter. The oxygen content has reduced from 58 × 10-6 to 32 × 10-6, and the nitrogen contents has reduced from 85 × 10-6 to 70 × 10-6 after process improvment.

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