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Tan Z.-L.,Beijing Jiaotong University | Wang K.-K.,Beijing Jiaotong University | Gao G.-H.,Beijing Jiaotong University | Gui X.-L.,Beijing Jiaotong University | And 3 more authors.
Journal of Iron and Steel Research International | Year: 2014

Quenching-partitioning-tempering (Q-P-T) process were applied to a quenched carbide-free bainite/martensite (CFB/M) multiphase steel 40Mn2Si2Cr and its effect on the mechanical properties was studied. The results showed that the partitioning time of Q-P-T treatment can be increased greatly to 90 min or even longer. The tensile strength, elongation and product of strength and elongation (PSE) of the experimental steel can achieve 1650 MPa, about 20% and over 33 GPa · %, respectively. The significant increase of partitioning time and excellent mechanical properties could be related to the CFB microstructure introduced in the quenching process during the Q-P-T treatment. © 2014 Central Iron and Steel Research Institute. Source

Chen Q.-A.,Control Iron and Steel Research Institute, China | Che Y.-M.,The Chinese Society for Metals | Zhe Q.-Y.,Xian University of Architecture and Technology
Kang T'ieh/Iron and Steel | Year: 2012

The strategy discussion on the updating of ribbed bar and related resource problem was necessary based on its massive production. In point of view of extreme resource utilization, the outstanding local difference in China and the limited sales radius of ribbed bar brought the multi-purpose and local preparing technique to the ribbed bar updating and then the local standard was recommended. The concept of alternating strain base design should be introduced in the ribbed bar updating to ensure the anti-seismic properties of rebar. The resent (Q235+Mn) and (Q235+Mn+MA) strengthening pattern had the shortage of the resource and the welding jointing should not utilize the resource full. It was recommended to develop the (Q235+C) strengthening pattern for the mechanical jointing of rebar in order to get better effect of resource utilization. The preliminary lab result was given. Source

Weng Y.-Q.,The Chinese Society for Metals | Yang C.-F.,Control Iron and Steel Research Institute, China | Shang C.-J.,University of Science and Technology Beijing
Kang T'ieh/Iron and Steel (Peking) | Year: 2011

During the last decade, the adjustment of product segments always is a very important task of iron industry, and upgrading of steel products has being impelled actively by Chinese iron and steel industry. With rapidly increasing of iron and steel production, a series of research achievements have been made in the technology area of high strength low alloy (HSLA) steel, and also have been applied successfully in the actual production, e.g. the technology of fine grain and ultra-fine grain steels, the technology for the control of microalloying precipitates. It is an important strategic goal of "Twelfth Five-Year Plan" for Chinese iron and steel industry that the adjustment of steel product segments and meeting the requirements for upgrading of domestic and oversea equipment manufactory industry. Adopting HSLA steel with better performance, instead of plain steel, could save steel consumption largely, and also release pressures from resource, energy and environment. Without doubt, it is the only way to realize the sustained development of Chinese iron and steel industry by popularizing the application of HSLA steels vigorously. Source

Lang Y.-P.,Control Iron and Steel Research Institute, China | Chen H.-T.,Control Iron and Steel Research Institute, China | Weng Y.-Q.,The Chinese Society for Metals | Qu H.-P.,Control Iron and Steel Research Institute, China
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2013

The Thermo-Calc software was used to calculate the influence of pressure factor and elements including C, Cr, Mn and Ni on the solubility of nitrogen, the phase transformation during solidification in high nitrogen austenitic stainless steel with 22%(mass fraction) Cr. The microstructures and precipitates of new designed high austenitic stainless steel were studied also. The results show that Cr increases mainly the solubility of nitrogen in liquid steel. With about 0.1%C the minimum solubility of nitrogen during higher solidification temperature is enhanced remarkably. Mn increases not only the solubility of nitrogen in liquid steel but also the minimum solubility of nitrogen during earlier solidification. With proper Mn the phase area of austenite is extended and more stably, also the "ferrite trap" can be avoided. With a little nickel less than 2% the minimum solubility of nitrogen during higher solidification temperature is enhanced and the temperature extension of δ phase presence is reduced, also to make sure full austenite in steel at room temperature. Melting under pressure is efficiently to increase the solubility of nitrogen. The main precipitates of new high austenitic stainless steel are Cr23C6 and Cr2N. To use thermodynamic calculation tools can be beneficial to research the melting, structure, heat treatment and hot working of high nitrogen austenitic stainless steels. Source

Shi C.,National Science Foundation | Zhong Z.,The Chinese Society for Metals
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2010

In this paper the development course of superally in China, The technical progress and innovation in recent years and works in the future are described. Source

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