Analysis on clogging of submerged entry nozzle in continuous casting of high strength steel with rare earth

2021 ◽  
Author(s):  
Wei Liang ◽  
Jing Li ◽  
Bin Lu ◽  
Jian-guo Zhi ◽  
Shuai Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Continuous Casting ◽  
High Strength Steel ◽  
Submerged Entry Nozzle ◽  
High Strength

Microstructure and Mechanical Properties of Low Alloy Ultra-High Strength Steel Microalloyed with Cerium

2021 ◽  
Vol 871 ◽  
pp. 53-58
Author(s):  
Yue Yue Jiang ◽  
Zhao Dong Wang ◽  
Xiang Tao Deng ◽  
R.D.K. Misra
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Impact Energy ◽  
High Strength Steel ◽  
Earth Element ◽  
High Strength ◽  
Matrix Composition ◽  
Microstructure And Mechanical Properties ◽  
Ultra High Strength Steel

This study aims to investigate the influences of rare earth element cerium (Ce) on microstructure and mechanical properties of low alloy ultra-high strength steel. The strength, plasticity, and impact toughness of steels with 0.0367% Ce and without Ce were tested. The influence mechanism of Ce on the microstructure and mechanical properties were investigated by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and electron back scattered diffraction (EBSD). The results showed that the addition of Ce improved the comprehensive mechanical properties of low alloy ultra-high strength steel. In particular, the plasticity and toughness were improved obviously. The addition of Ce increased the elongation from 9.47% to 10.49%, and the low-temperature impact energy from 50J to 58J. The elongation and impact energy increased by 10.77% and 16%, respectively. And the yield strength of all samples remained above 1400 MPa. The rare earth element Ce did not change the matrix composition phase which were martensite. However, the addition of Ce increased the proportion of high-angle grain boundary from 33.2% to 40.2%. In addition, the Ce make the inclusions denatured and hence spherical inclusion with small size can be obtained. The EDS results showed that rare earth and harmful elements P and O formed inclusions, which as a purifier for the molten steel and hindered the formation of the large-size composite inclusions.

Effect of Ce-La on inclusion evolution in Al-killed high strength steel

2020 ◽  
Vol 117 (6) ◽  
pp. 616
Author(s):  
Ruming Geng ◽  
Jing Li ◽  
Chengbin Shi ◽  
Jianguo Zhi ◽  
Bin Lu
Keyword(s):  
Rare Earth ◽  
Dissolved Oxygen ◽  
Molten Steel ◽  
High Strength Steel ◽  
High Strength ◽  
Thermodynamic Calculations ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Rare Earth Addition ◽  
La Addition

The mechanism of inclusion evolution after rare earth addition based on oxide metallurgy was investigated experimentally and using thermodynamic calculations, where Ce-La was added to Al-killed high strength steel during Ruhrstahl-Heraeus refining to modify the oxide inclusions within the steel. The typical inclusions observed before Ce-La addition were spherical magnesium aluminate spinel inclusions. And fewer individual Al2O3 inclusions and Al2O3–TiOx inclusions were also observed. The addition of Ce-La led to transformation of MgO · Al2O3 spinel inclusions to (Ce,La)2O3, (Ce,La)2O2S and (Ce,La)2O2S + MgO · Al2O3 inclusions. Thermodynamic calculations indicated that Ce-La combined with dissolved oxygen and sulfur in molten steel to form rare earth inclusions, while the remainder of the Ce and La modified MgO · Al2O3 to (Ce,La)2O3 and (Ce,La)2O2S.

scholarly journals Improvement in Microstructure and Toughness of Large Heat-input Weld Bond of High Strength Steel Due to Addition of Rare Earth Metals and Boron

1977 ◽  
Vol 17 (7) ◽  
pp. 419-427 ◽  
Author(s):  
Tokushi FUNAKOSHI ◽  
Tomoo TANAKA ◽  
Syuzo UEDA ◽  
Masaaki ISHIKAWA ◽  
Noriaki KOSHIZUKA ◽  
...  
Keyword(s):  
Rare Earth ◽  
Heat Input ◽  
High Strength Steel ◽  
Rare Earth Metals ◽  
High Strength ◽  
Large Heat

scholarly journals High-strength steel S960QC welded with rare earth nanoparticle coated filler wire

2018 ◽  
Vol 102 (1-4) ◽  
pp. 105-119 ◽  
Author(s):  
Cyril Vimalraj ◽  
Paul Kah ◽  
Pavel Layus ◽  
Eric Mvola Belinga ◽  
Sergey Parshin
Keyword(s):  
Rare Earth ◽  
High Strength Steel ◽  
High Strength ◽  
Filler Wire

Microstructure and Property of 700MPa Ti Microalloyed High Strength Steel Produced by EAF-CSP

2011 ◽  
Vol 287-290 ◽  
pp. 961-965
Author(s):  
Ji Xiang Gao ◽  
Xin Ping Mao ◽  
Qi Lin Chen ◽  
Lie Jun Li
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Continuous Casting ◽  
High Strength Steel ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Rolling Process ◽  
Precipitation Strengthening ◽  
Smelting Process ◽  
Hot Rolled

High strength steel ZJ700MC with yield strength grade of 700 MPa was successfully developed by Ti micro-alloyed technology in the EAF-CSP line at Zhujiang Steel. The composition design, smelting process, continuous casting and rolling process of the steel, as well as the mechanical properties of the hot-rolled product are introduced in the paper. An analysis on the strengthening mechanism of the high strength steel shows that the enhanced strength and toughness of the steel were caused by the refinement of ferrite grain and the precipitation strengthening of TiC.

scholarly journals Improvement in Microstructure and Toughness of Large Heat-Input Weld Bond Due to Addition of Rare Earth Metals and Boron in High Strength Steel

1977 ◽  
Vol 63 (2) ◽  
pp. 303-312 ◽  
Author(s):  
Tokushi FUNAKOSHI ◽  
Tomoo TANAKA ◽  
Syuzo UEDA ◽  
Masaaki ISHIKAWA ◽  
Noriaki KOSHIZUKA ◽  
...  
Keyword(s):  
Rare Earth ◽  
Heat Input ◽  
High Strength Steel ◽  
Rare Earth Metals ◽  
High Strength ◽  
Large Heat

Development of Micro-Alloying Ultra-Fine Grain High Strength Steel Produced by EAF-TSCR

2011 ◽  
Vol 697-698 ◽  
pp. 474-478
Author(s):  
Ji Xiang Gao ◽  
Xin Ping Mao ◽  
L.J. Li
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Continuous Casting ◽  
High Strength Steel ◽  
Raw Materials ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Fine Grain ◽  
Ferrite Grain Size

Based on the characteristics of raw materials in EAF-TSCR, the composition of VN micro-alloyed was designed, the processes of the steelmaking, continuous casting, soaking, rolling, cooling were controlled, and at last the VN Micro-alloying high strength steel with ultra-fine grain was developed. The ferrite grain size of the steel reaches 3.0 to 4.0 microns, and the yield strength of which reaches 550MPa. Besides, the steel processes good toughness, cold formability and weldability. In the end, the strengthening mechanism of the ultra-fine steel was discussed.

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