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Shijiazhuang, China

Huang F.,Hebei University of Science and Technology | Chen L.,Hebei University of Science and Technology | Ren Y.,Hebei University of Science and Technology | Huang Y.,Shijiazhuang Iron and Steel Co.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2015

In order to upgrade the cut-by-length technology of billet to cut-by-weight, a real-time accumulation vision weight method of billet based on linear structured laser was proposed, and its principle, measurement model and weighing process were studied. According to the vision measurement principle of linear structure laser, the current cross section area of billet was measured and calculated by two vision sensors. Meanwhile, the distance between the current cross section and the previous one was acquired by another vision sensor, and the billet weight between two adjacent cross sections was calculated and accumulated. Thus, the billet weight passing the measuring position was monitored real-timely, and the real-time weight-cut control of billet was realized. The experimental system was set up and the weight experiment was carried out with rectangular solid steel. Experimental results show that the relative error of weight is 1‰, which is far less than 8‰ used in present production enterprises. This research provides a theoretical reference for the realization of billet cut-by-weight technology. ©, 2015, Chinese Academy of Sciences. All right reserved.


Xu Y.,University of Science and Technology of China | Wu Y.-G.,Shijiazhuang Iron and Steel Co. | Zhang C.-J.,University of Science and Technology of China | Zhu L.-G.,University of Science and Technology of China
Journal of Iron and Steel Research International | Year: 2015

The formation and growth behavior of inclusions in the liquid steel were studied based on 45 steel by virtue of high temperature confocal laser scanning microscope. The structures of all kinds of complex inclusions formed in the process of cooling and solidification of liquid steel were analyzed, and disregistries between various inclusions were calculated. The results showed that inclusions with high melting point precipitated firstly, and inclusions with low disregistries precipitated later. The latter precipitated and grew up on the surface of the former, and finally clear layered complex inclusions formed. The low disregistry mechanism could not fully explain the forming reasons of all complex inclusions, but no matter which kind of mechanism leading to the formation of complex inclusions, its basic principle is that the first precipitated phase provides a low nuclear power interface for the latter, which can reduce the nucleation interface and strain energy barrier of the latter. © 2015 Central Iron and Steel Research Institute.


Cao Y.,Control Iron and Steel Research Institute, China | Xu L.,Control Iron and Steel Research Institute, China | Shi J.,Control Iron and Steel Research Institute, China | Wang X.,Shijiazhuang Iron and Steel Co. | Wang M.,Control Iron and Steel Research Institute, China
Jinshu Rechuli/Heat Treatment of Metals | Year: 2016

Hardenability of SAE 8620H gear steel was calculated by means of ideal critical diameter model, nonlinear equation model and hardness distribution model, then compared with the measured hardness values. The results show that the hardenability of the SAE 8620H steel is low, and a decreasing rate of hardness is 3 HRC/mm in the distance of 3 mm to 9 mm from the quenched end. It also shows that the error of predicted values in the distance of 9 mm and 15 mm from quenched end are less than 2 HRC compared with the measured one by using ideal critical diameter model and nonlinear equation model, while the error exceeds 2 HRC in the distance of 5 mm from quenched end. The results calculated by modified hardness distribution model show that the predicted values in the distance of 9 mm and 15 mm from quenched end decrease from 6.1 HRC and 3.8 HRC to less than 2 HRC. Therefore, modified distribution model can be used to calculate the hardenability of SAE 8620H gear steel. © 2016, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Xu Q.,Kunming University of Science and Technology | Xu Q.,Control Iron and Steel Research Institute, China | Hui W.,Kunming University of Science and Technology | Hui W.,Control Iron and Steel Research Institute, China | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

High cycle fatigue fracture behaviors of 60Si2MnA spring steel tempered at 400°C and 440°C were studied by using rotating bending fatigue test. The experimental results show that the tempering temperature has significant influence on its fatigue properties. That is, when tempered at higher temperature 440°C and thus obtained a lower strength level, most of the fatigue cracks initiate from specimen surface and conventional S-N curve exists; while when tempered at lower temperature 400°C and thus obtained a higher strength level, the S-N curve displays a continuous decline and fatigue failures originated mainly from large oxide inclusion and therefore conventional S-N curve does not exist. Though the fatigue strength of the specimen tempered at 400°C is high than that tempered at 440°C, the fatigue strength ratio of the latter is much higher than that of the former. It is suggested that the fatigue property of lower tempering specimen could be further improved by refining inclusion size.


Song S.Q.,Wuhan University of Science and Technology | Xue Z.L.,Wuhan University of Science and Technology | Zhang B.,Wuhan University of Science and Technology | Wang W.X.,Wuhan University of Science and Technology | And 2 more authors.
Ironmaking and Steelmaking | Year: 2014

Experimental research on smelting vanadium steel by direct alloying with self-reduction briquettes of V2O5 has been conducted in a medium frequency induction furnace of the laboratory and in a 60 t ladle of Shijiazhuang Iron and Steel Co. Ltd. The result indicates that the amount of the reductant (FeSi) and the flux (CaO) inside the self-reduction briquette of V2O5 have effects on the yield of vanadium during the direct alloying, and the optimum composition of the self-reduction briquette of V2O5 is 23·88V2O5-29·75FeSi- 15·93CaO-30·44CaF2. When smelting vanadium steel by direct alloying in a 60t ladle, the average yield of V is 96·54%. Meanwhile, the steel product could achieve the required quality level. © 2014 Institute of Materials, Minerals and Mining.

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