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Laiwu, China

Wang J.,Laiwu Steel Group
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Austenite continuous cooling transformation and the effect of different quenching and tempering process on the microstructure and properties of Q690D steel plate were researched by MMS-200 thermal simulated test machine. The results show that, when the cooling rate is in the range of 7-15 ℃/s, the microstructure can be transformed to martensite. When the quenching heating temperature is 780 ℃, the microstructure is uneven resulted from uncomplete austenitizing. When the quenching temperature is higher than 840 ℃, the microstructure of the steel plate changes very little. With the increase of tempering temperature, the strength of the steel plate reduces. Source


Hao L.,CAS Shenyang Institute of Metal Research | Zhang S.,Northeastern University China | Zhang S.,Laiwu Steel Group | Dong J.,CAS Shenyang Institute of Metal Research | Ke W.,CAS Shenyang Institute of Metal Research
Corrosion Science | Year: 2011

In this work, atmospheric corrosion resistance of low cost MnCuP weathering steel in simulated coastal, industrial, and coastal-industrial atmospheric environments was investigated by wet/dry cyclic acceleration corrosion tests. The results indicate that MnCuP weathering steel exhibits high corrosion resistance in the three atmospheres. Besides, the alloying effect of Mn, Cu, and P elements on the anti-corrosion mechanism of MnCuP weathering steel was discussed by techniques of X-ray photoelectron spectroscopy, potential-pH diagram, and electron probe microanalysis. © 2011. Source


Cai X.,Northeastern University China | Liu C.,Laiwu Steel Group | Liu Z.,Northeastern University China
Materials and Design | Year: 2014

We investigate here the three-stage cooling process of dual phase (DP) steels with the prepositional ultra fast cooling (UFC) equipment, which is different with the DP production line, with UFC in the end. Two dimensional finite difference model (FEM) was used to calculate the temperature field during the cooling process and classical thermodynamic model is used to develop CCT diagram. The temperature field and phase transformation process are combined to predict the microstructure and the mechanical properties across the cross-section using the thermodynamic model and the empirical model. The experiments present good mechanical properties of DP steels, which proved the production of DP steels with the prepositional UFC equipment is feasible. © 2013 The Authors. Source


Hao L.,CAS Shenyang Institute of Metal Research | Zhang S.,Northeastern University China | Zhang S.,Laiwu Steel Group | Dong J.,CAS Shenyang Institute of Metal Research | Ke W.,CAS Shenyang Institute of Metal Research
Corrosion Science | Year: 2012

The evolution of atmospheric corrosion of MnCuP weathering steel in a simulated coastal-industrial atmosphere was investigated by weight gain, SEM, XRD, and electrochemical measurements. The results indicate that the corrosion kinetics divides into two stages with a higher corrosion rate in the first stage and a lower rate in the second stage. The increased amount of α-FeOOH indicates an improved resistance of the rust. The rust enhances initially and then stabilizes the cathodic process, but the anodic process tends to be inhibited. The EIS results indicate that the protective ability of the rust layer can be evaluated by the charge transfer resistance. © 2012. Source


Hao L.,CAS Shenyang Institute of Metal Research | Zhang S.,Northeastern University China | Zhang S.,Laiwu Steel Group | Dong J.,CAS Shenyang Institute of Metal Research | Ke W.,CAS Shenyang Institute of Metal Research
Corrosion Science | Year: 2012

The corrosion evolution of a Mo-Cu-bearing fire-resistant steel in a simulated industrial atmosphere was investigated by corrosion weight gain, XRD, EPMA, XPS, and polarization curves. The results indicate that the corrosion kinetics is closely related to the rust composition and electrochemical properties. As the corrosion proceeds, the relative content of γ-FeOOH and Fe3O4 decreases and α-FeOOH increases, and the rust layer becomes compact and adherent to steel substrate. Molybdenum and copper enrich in the inner rust layer, especially at the bottom of the corrosion nest, forming non-soluble molybdate and Cu(I)-bearing compounds responsible for enhanced corrosion resistance of the rust layer. © 2011. Source

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